Top 6 How Fast Does A Honda 400Ex Go Trust The Answer

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How fast is a 2003 Honda 400EX?

The 2003 Honda 400EX (otherwise known as SporTrax) hails from the sport-ATV lineup that signaled the renaissance of the sport riding segment. Featuring an XR400R-adopted engine, 72-mph top-speed rating, and Pro-Link rear suspension, it has become a crowd favorite among sport-rec, 4-stroke quads.

How fast is a 400EX four wheeler?

Thanks to RFVC (Radial Four-Valve Combustion Chamber) and an XR400R-adopted power mill, the 2004 Honda 400EX supports a top speed of 72 mph (116 km/h) and a horsepower of 28 RWHP (20.59 kW).

How much is a 400EX worth?

Values
Suggested List Price Average Retail
Base Price $6,399 $5,360
Options (Add)
Total Price $6,399 $5,360

Is a 400EX a 4 stroke or 2 stroke?

single-cylinder four-stroke engine.

How fast does a Honda TRX 700 go?

Top speed approximately 86 MPH.
Honda TRX 700XX
Engine 686cc liquid-cooled four-stroke

How fast is a Honda 450r?

Specifications
2004/2005 TRX450r 2006/2007/2008 TRX450r
Dry Weight 162/168 kg R/ER
Colors 2004: Red 2005: Red or Black 2006: Red or Black
Warranty 6 months
Top Speed 74 mph (everything stock)

Does Honda still make the 400EX?

Unfortunately, the 400EX was discontinued by Honda in 2009, but considering how widely popular this ATV was, the market is still flooded with Honda 400EXs.

How much horsepower does a Honda 400EX have?

In terms of horsepower, the two machines were about equal. The 400EX put out 25.4 horsepower on the White Brothers dyno back in 1999. Most surviving 250Rs were heavily modified by then, but a stock one would have had similar peak output to the new 400. The biggest difference was the width of that powerband.

How fast does a Yamaha Warrior 350 go?

A stock Yamaha Warrior 350 can reach speeds of up to 63 mph on even surfaces.

How much is a 2001 400 EX worth?

Values
Suggested List Price Average Retail
Base Price $5,699 $1,765
Options (Change)
Total Price $5,699 $1,765

How much is a new Honda 400?

2021 Honda FourTrax Rancher 4×4 • $6,499

Every one is loaded with the features you want, like rugged front and rear racks, a spacious front utility compartment, wide front drive-shaft guards, and an easy-to-use reverse system.

Does Honda still make sport ATVS?

Lineup: New Honda ATV Models

Check list prices for the full Honda ATV lineup: Foreman, Rubicon, Rancher, Recon, Rincon and Sport ATV. Just select the type and year you are looking for below. Note: We might already have your perfect ATV in stock among our Honda quads for sale.

How heavy is a Honda 400?

Honda CB400SF
Manufacturer Honda
Dimensions L : 2,040 mm (80 in) W : 725 mm (28.5 in) H : 1,070 mm (42 in)
Seat height 755 mm (29.7 in)
Weight 200 kg (440 lb) (wet)
Fuel capacity 18 L (4.0 imp gal; 4.8 US gal)

What was the last year for Honda 400ex?

Click Here for more details… Today, March 19th, Honda has officially put the nail in the coffin at the possibility and hope all of us ATV enthusiasts had of a newly upgraded and changed 2017 TRX450R. This update also included notes that they will not build a 2017 TRX400X (previously known as TRX400EX).

How big is the gas tank on a Honda 400ex?

The massive 5.5G tank holds 5.5 gallons (20.9 liters) of fuel for those off road adventures or extended trips. The extra capacity allows you to go further between stops or prevent you from getting stranded on the tails. Made from high density plastic it is extremely durable and long lasting.

How much horsepower does a Honda 400EX have?

In terms of horsepower, the two machines were about equal. The 400EX put out 25.4 horsepower on the White Brothers dyno back in 1999. Most surviving 250Rs were heavily modified by then, but a stock one would have had similar peak output to the new 400. The biggest difference was the width of that powerband.

What is a 400EX?

The Honda TRX 400EX is a well-known entry level ATV. The kind that leads to the harder, scarier ATVs able to make tears run down your cheeks in the first second, and dry them all up in the second.

How much does a 2006 Honda 400EX weight?

2006 Honda TRX400EX Specifications
Model: TRX400EX
Ground Clearance: 4.3 inches
Wheelbase: 48.4 inches
Turning Radius: 10.5 feet
Dry Weight: 386 pounds
31 thg 5, 2005

Honda TRX 400ex Top Speed Test! (70mph?)
Honda TRX 400ex Top Speed Test! (70mph?)


2003 Honda 400EX SporTrax (Specs and Review) – Off-Roading Pro

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  • Most searched keywords: Whether you are looking for 2003 Honda 400EX SporTrax (Specs and Review) – Off-Roading Pro Updating The 2003 Honda 400EX (otherwise known as SporTrax) hails from the sport-ATV lineup that signaled the renaissance of the sport riding segment.
  • Table of Contents:

About the 2003 Honda TRX 400EX

2003 Honda 400EX Specs & Features

2003 Honda 400EX Price

Honda 400EX Starting Issue

About Honda

Conclusion – 2003 Honda 400EX Review

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2003 Honda 400EX SporTrax (Specs and Review) - Off-Roading Pro
2003 Honda 400EX SporTrax (Specs and Review) – Off-Roading Pro

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2004 Honda 400EX Sportrax (Specs and Review) – Off-Roading Pro

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  • Most searched keywords: Whether you are looking for 2004 Honda 400EX Sportrax (Specs and Review) – Off-Roading Pro Updating The 2004 Honda 400EX (a.k.a. Sportrax 400EX) is a pure-sport 4×4 responsible for the renaissance of the Sport-ATV segment. Boasting a 397-cc
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The 2004 Honda Sportrax® TRX 400EX

2004 Honda 400EX Specs & Features

Cost of a 2004 Honda 400EX

Sportrax 400EX Common Problems

About Honda

Conclusion – 2004 Honda 400EX Review

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2004 Honda 400EX Sportrax (Specs and Review) - Off-Roading Pro
2004 Honda 400EX Sportrax (Specs and Review) – Off-Roading Pro

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2014 Honda TRX400EX Prices and Values – NADAguides

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2014 Honda TRX400EX Prices and Values - NADAguides
2014 Honda TRX400EX Prices and Values – NADAguides

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Honda 400ex Specs, HP, Weight and Top Speed – ATV Style | Guides, Reviews, Specs and VIN Help

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  • Summary of article content: Articles about Honda 400ex Specs, HP, Weight and Top Speed – ATV Style | Guides, Reviews, Specs and VIN Help It has a 28 horsepower engine and the Honda 400EX has a top speed of 72 MPH. The 400EX also sports a sturdy steel frame with removable sub-frame and … …
  • Most searched keywords: Whether you are looking for Honda 400ex Specs, HP, Weight and Top Speed – ATV Style | Guides, Reviews, Specs and VIN Help It has a 28 horsepower engine and the Honda 400EX has a top speed of 72 MPH. The 400EX also sports a sturdy steel frame with removable sub-frame and …
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Honda 400ex In-Depth Guide

Honda 400EX Piston Sizing and Overbore

Additional information about the Honda 400EX ATV

Honda 400ex Top Speed

Honda 400ex Oil Type and Capacity

Honda 400ex Specs, HP, Weight and Top Speed - ATV Style | Guides, Reviews, Specs and VIN Help
Honda 400ex Specs, HP, Weight and Top Speed – ATV Style | Guides, Reviews, Specs and VIN Help

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400ex top speed – ATVConnection.com ATV Enthusiast Community

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  • Summary of article content: Articles about 400ex top speed – ATVConnection.com ATV Enthusiast Community Honda – 400ex top speed – anybody know how fast a stock 06 400ex will go. … 400ex top speed. ive seen them do about 65mph, or somthing like that. …
  • Most searched keywords: Whether you are looking for 400ex top speed – ATVConnection.com ATV Enthusiast Community Honda – 400ex top speed – anybody know how fast a stock 06 400ex will go. … 400ex top speed. ive seen them do about 65mph, or somthing like that. 400ex,top,speed,08, 2006, 2007, 2008, 400, 400ex, bored, eiger, fast, jet, kit, max, speed, suzuki, top, trx400ex, 400ex top speed, atv, honda atv, honda atvs, yamaha atv, yamaha atvs, kawasaki atv, kawasaki atvs, suzuki atv, suzuki atvs, polaris atv, polaris atvs, utv, atv forum, atv forums, kawasaki, yamaha, suzuki, polaris, quad, quad bike, atv quads, quadingHonda – 400ex top speed – anybody know how fast a stock 06 400ex will go
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 400ex top speed - ATVConnection.com ATV Enthusiast Community
400ex top speed – ATVConnection.com ATV Enthusiast Community

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speed of 400ex [Archive] – ATV Riders Forum

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 speed of 400ex [Archive]  - ATV Riders Forum
speed of 400ex [Archive] – ATV Riders Forum

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What is the top speed for a Honda 400ex? – All Famous Faqs

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  • Most searched keywords: Whether you are looking for What is the top speed for a Honda 400ex? – All Famous Faqs … 56 HP out of my 400 ex Fast and very reliable, … Why does the surgeon general wear a Navy uniform? Generally, fresh from the factory, the 400 will do anywhere from 65-70, with most people finding 68 as the average top speed.
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How fast is a 2003 400EX

How much horsepower does a 2004 Honda 400EX have

How many horsepower is a 400EX

How tall is a Honda 400EX

How fast does a TRX450R go

How fast does a Honda TRX 700 go

Did Honda stop making 400ex

What brand is a 400ex

How much horsepower does a TRX450R have

Does a 2007 Honda 400ex have reverse

How do I tell what year my 400ex is

How big is a Honda 400ex gas tank

How much CC does a Honda 400ex have

What is the fastest stock ATV

How fast does a trx250r go

Does the TRX450R have reverse

How fast does a Raptor 700r go

How fast is a Yamaha Banshee

How fast is a Honda FourTrax 300

How much is a new Honda 400EX

Will Honda ever make quads again

How much does a 2002 Honda 400EX weight

Does 2001 Honda 400ex have reverse

Who makes sport quads still

Does Honda still make the TRX 450

When did they stop making TRX 450R

How much HP does a 2005 TRX 450R have

How do you reverse a 400ex

How do you put a four wheeler in reverse

How do you put a quad bike in reverse

Where is the VIN on a 400ex

How do you tell what year a four wheeler is by the VIN number

How do you read a ATV VIN number

What oil does a 2004 400ex take

Is the Honda TRX 400 automatic

How fast does a Honda 440ex go

What is the top speed for a Honda 400ex? - All Famous Faqs
What is the top speed for a Honda 400ex? – All Famous Faqs

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Honda 400ex Top Speed – How To Discuss

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    What is the maximum speed of a 300ex?
    | 300ex will do around 50s mph.

    Also, how fast does a 300ex go?
    A standard 300ex will do well on a flat road at 5254 mph.

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Honda 400ex Top Speed - How To Discuss
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Honda 400ex – Otosection

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  • Most searched keywords: Whether you are looking for Honda 400ex – Otosection it has a 28 horsepower engine and the honda 400ex has a top speed of 72 mph. the 400ex also sports a sturdy steel frame with removable sub frame and … –> Honda 400ex Specs Hp Weight And Top Speed Atv Style Guides Honda 400ex in depth guide the honda 400ex is a 375lb all terrain vehicle(atv) manufactured by ho
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Honda 400ex – Otosection
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2003 Honda 400EX SporTrax (Specs and Review)

Disclosure: We may get commissions for purchases made through links in this post.

The 2003 Honda 400EX (a.k.a. TRX400EX or SporTrax) has become a household name among hobbyists and enthusiasts. Its popularity should be no surprise since the 400-cc SporTrax has always been regarded as one of the most capable and fun quads around. Ruggedly aesthetic and stark, this 4×4 introduced pure-sport 4-strokes into the ATV landscape and provided consumers thrills and a whole lot more – as you will soon discover in this guide.

The 2003 Honda 400EX (otherwise known as SporTrax) hails from the sport-ATV lineup that signaled the renaissance of the sport riding segment. Featuring an XR400R-adopted engine, 72-mph top-speed rating, and Pro-Link rear suspension, it has become a crowd favorite among sport-rec, 4-stroke quads.

Simplicity, versatility, and pure-sport ergonomics only form part and parcel of the 2003 Honda 400EX’ key selling points. Continue reading about the specs, features, and lowlights of this sport riding bigwig in this article to learn more.

About the 2003 Honda TRX 400EX

The 2003 Honda 400EX is the 5th installment of the Sportrax lineup since its inception in 1999. A sport-oriented machine down to its core, the SporTrax’s dedication to the revival of the sport riding segment became a rallying point for its loyal followers. Consequently, it also led to the Honda 400EX making a name for itself as a motocross-worthy four-wheeler.

Winning the Baja 1000 fresh out of the crate is immensely responsible for this remarkable feat. The machine would not have been able to achieve this had it not been for its XR400R-inspired engine and other race-ready components.

Ultimately, Honda wanted the ’03 model to dominate MX/GNCC arenas alongside powerful 2-stroke contenders already gracing the sport-ATV scene. But due to setbacks in overall design and scarcity of tech and feature upgrades, the machine was eventually resigned to being a serious trail tamer.

2003 Honda 400EX Specs & Features

Engine

The 2003 Honda 400EX is brought to life by an air-cooled, single-cylinder 4-stroke engine. Piston displacement is 397-cm3 (24.23 in3), the bore-stroke ratio is 85 × 70 mm (3.35 × 2.76 inches), and the compression ratio is 9.1:1. This racing-inclined power mill equips a Radial Four-Valve Combustion Chamber and a 38-mm piston valve with an accelerator pump. The 38-mm carb mates to oiled, urethane-foam air filtration and dry-sump lubrication and handles air-fuel mixture.

Given the SporTrax engine was adopted from the XR400R, its configuration will naturally lend to a 2003 Honda 400EX top speed of 65 – 72 mph (105 – 116 km/h) and a 28 RWHP (20.59 kW) horsepower. Overall, the quad’s powerplant is pretty robust. However, you will need to adjust the carburetor for high-altitude riding above 3,000 feet or 1,000 meters.

Fuel & Lubrication

It has a 2.64 US gallon fuel tank capacity. Using fuel with the appropriate octane rating is fundamental and reduces (if not eliminates) engine pinging or spark knock. Preventing contaminants such as dust, dirt, or water from getting inside the tank also helps.

Engine pinging results from the air and fuel mixture inside an engine cylinder igniting incorrectly. Hence, expect slight pinging when riding uphill or under heavy load, as these circumstances can potentially cause mistimed ignition. However, consulting a professional mechanic or immediately changing fuel brands is strongly advised if pinging occurs at sustained speeds or under normal riding conditions.

As for engine oil, capacity is 1.7 liters/1.8 US quarts (after draining) or 2.2 liters/2.3 US quarts (at disassembly) of SAE 10W-40 Pro Honda GN4/HP4 motor oil or its equivalent. Other viscosity grades – SAE 5W, 10W-30, 20W-40, or 20W-50 – are permitted for use following ambient temperature.

For excellent lubrication and unaffected clutch performance, use oil variants with a minimum API grade of SJ+ meeting JASO T903 MA/MB standards. Refrain from using non-detergent, vegetable, castor-based racing, or engine oils with graphite or molybdenum additives.

Drivetrain

Power travels to the ground via a 5-speed constant-mesh transmission and a cable-operated, wet, multi-plate clutch assembly (with a 1-N-2-3-4-5 gearshift sequence) sans reverse. An RK520 SMOZ10S or DID520V6 O-ring sealed chain (96 or 120 links + joint) – replaceable by a DID 520ERT3120RB 520 ERT3 Series Exclusive Racing Chain (view on Amazon) – handles wheel spin.

A gear-driven counter-balancer reduces unwanted engine vibration, making for smooth maneuverability regardless of terrain difficulty. Plus, its fording depth limit of 10 inches (25.4 cm) allows the quad to traverse shallow water crossings with ease.

Primary Reduction Ratio 2.826 (23/65) Final Reduction Ratio 2.533 (15/38) Transmission Gear Ratio – I 2.917 (12/35) Transmission Gear Ratio – II 1.938 (16/31) Transmission Gear Ratio – III 1.474 (19/28) Transmission Gear Ratio – IV 1.182 (22/26) Transmission Gear Ratio – V 1.000 (26/26)

Controls

Placement of most of the controls – such as the clutch and parking brake levers, start button, headlight/dimmer/engine stop switches – are located on the left handgrip and has been this way for the majority of the 2003 Honda 400EX year models. The fuel valve, gear pedal, and choke lever are on the same side of the engine.

Throttle levers, front brake fluid reservoir, front brake, and clutch lever are on the right handgrip. The neutral indicator lamp and ignition switch remain on the center console, while the rear brake fluid reservoir and operator foot peg are on the right side of the 4×4.

Ignition

An ICM (or Ignition Control Module) and electric starting system with an idle speed of 1,400 ± 100 RPM brings the ’03 SporTrax to life. A single-phase (SCR shorted, full-wave) alternator with a rated output of 0.147 kW @ 5,000 RPM serves as its charging system.

It uses a maintenance-free 12V 8Ah/(10 HR) YTX9-BS battery with dimensions of 150 x 87 x 105 mm for powering electronic accessories. It also requires a Nippon Denso X24GPR-U or NGK DPR8Z spark plug with a 0.024–0.028 inch gap and torque spec of 1/8 – 1/4 turn (old plugs) or 1/2 turn (new plugs) after the plug seats. For extended, high-speed riding, switch to an NGK DPR9Z or Nippon Denso X27GPR-U spark plug instead.

Tires & Brakes

Front 22 x 7-10 M/R 101 and rear 20 x 10-9 M/R 501 Ohtsu radials (each with a 4/110 bolt pattern) mount on steel or aluminum wheels. These knobbies pair with all-wheel-drive triple hydraulic discs (174-mm dual front discs and a single 220-mm rear disc) with dual brake calipers, providing the 4×4 a 70:30 percent ratio of its stopping power.

Front wheels are 10×5.5 AT mags, while rear ones are on 9×8.0 AT rims (view on Amazon). Aftermarket tires like Maxxis Razr 4-Ply Sport Tires (view on Amazon) are excellent replacements for stock rubber in case of wear or damage.

Front and rear cold-tire pressure should be 27 kPa. Depending on the terrain type, airing down or inflating tires within the range of 23 kPa to 31 kPa is permitted. Regular tire tread inspection is important, as a depth of at least 0.1875 inches (4.0 mm) warrants immediate tire replacement.

Suspension

Enclosed in a double-cradle steel frame (6.5° caster angle, 28-mm trail) are independent, front double-wishbone with 5-way preload-adjustable shocks and a Pro-Link rear swingarm with a fully adjustable Showa mono-shock. Each setup offers a respective wheel travel of 209 mm/8.2 inches and 230 mm/9.1 inches.

The 48.4-inch/1,230-mm wheelbase, 4.3-inch/110-mm ground clearance, and 3.2-meter/10.5-feet turning radius remain unchanged as in previous-year models. All in all, the machine’s suspension components make for reduced unsprung weight, tighter cornering, and improved traction.

Dimensions

Overall dimensions of the 2003 Honda TRX400EX are 72.2×45.3×43.7 inches. Seat height conveniently accommodates medium-built to taller riders at 810 mm/31.9 inches and is perfect for ripping through flat surfaces. The GVWR estimate is at 635 lbs., including the maximum load capacity of 243 lbs., the curb weight of 392 lbs., and a full gas tank.

Exterior

The ’03 SporTrax was one of the earlier models that had yet to receive Team Honda-inspired graphics. The overall styling is simplistic and great for customization while robust enough to safeguard the engine and other internal components from the elements. The front cowl and factory fenders can benefit from racing decals and aftermarket 2003 Honda 400EX parts to add a touch of aggressiveness to the quad.

2003 Honda 400EX plastics were available in red and yellow, with body-matching, high-clearance fenders, and heavy-duty urethane skid plates that protect the wheeler’s underside and rear brake-disc/sprocket. You can keep the body panels as damage-free as possible by spray cleaning them with running water and mild detergent. Refrain from using a power hose, as it can cause abrasions and lead to corrosion.

2003 Honda 400EX Price

The 2003 Honda 400EX retained its list price of $5,699, cheaper by $400 against the 2000 MSRP. This competitive pricing gave it an edge over its same-class counterparts. Furthermore, it was a sensible decision on Honda’s part, as virtually nothing has changed in the machine’s framework and overall design. Like production models from the previous year, the ’03 SporTrax only offered standard trims – perhaps, a means for the Japanese firm to keep the quad’s retail pricing in check.

As for resale values, prices range from $1,805 to $2,375 per Nada Guides data. About the same price range – from $978 to $3,000 – shows in auction listings, Craigslist, and other trader sites. Most of these pre-owned units are in decent, running condition, and frequently sold in the UK, California, Texas, and North Carolina. Near-mint quads would naturally fall on the higher end of the price spectrum and come equipped with performance-enhancing add-ons, raising the average resale price by at least $500.

Honda 400EX Starting Issue

Bore increases and fuel/electrical system problems aside, a no-start issue is innate with the ’03 Honda SporTrax. And usually, the first thing you will notice is your starter motor attempting to turn your engine over without any luck. When this happens, check the spark plug tightness, engine stop switches, and battery while ensuring the latter has a full charge.

Likewise, determine if any bore modification was done and if this was performed correctly. If these components check out, you may begin inspecting other components to pinpoint if the culprit is engine flooding, fuel starvation, or some other type of breakdown.

Other problems to watch out for are head gasket leaks, flimsy swingarm, overheating, and intermittent stalling. The clutch and gearbox are reportedly problematic – especially for heavily modded quads or those used for racing applications. Stock tires are also not as puncture or damage-resistant as owners would have liked.

More often than not, these issues stem from driving habits and do not necessarily mean the 4×4 falling short on durability. Thankfully, your service manual provides relevant information on how to address these hiccups.

About Honda

Honda Motor Company Ltd. is a Japanese conglomerate known worldwide for its ingenuity in automotive design and a dominant force in the ATV and motorcycling industries. Established in 1937 as Tōkai Seiki or Eastern Sea Precision Machine Company, Honda began as Toyota’s supplier of mass-produced piston rings.

Since then, the Japanese firm has come a long way, diversifying its product offerings to include surplus engines, motorized bicycles, mini pickup trucks, and eventually venturing into ATVs like the 2003 Honda 400EX.

Conclusion – 2003 Honda 400EX Review

It took another two years for Honda to give the 2003 Honda 400EX suspension upgrades. But even then, the four-wheeled machine still was not at the receiving end of GNCC-worthy modifications. Most old-timers may think the company’s show of restraint did it more harm than good.

But for enthusiasts with a clearer understanding of the future, the quad’s starkness certainly gave us, owners, more freedom to make the vehicle their own. Highly-skilled operators and casual riders can agree that the ability to customize a machine can dramatically improve one’s riding experience – whether on wooded trails or hard-packed roads.

2004 Honda 400EX Sportrax (Specs and Review)

Disclosure: We may get commissions for purchases made through links in this post.

Hailing from one of the industry’s longest-running ATV lineups, the 2004 Honda 400EX (a.k.a. TRX400EX or Sportrax) was an important milestone in developing current sport quads. Aggressively-styled and fast, this wheeler signaled the revival of the sport-ATV segment and the beginning of 4-stroke quads.

The 2004 Honda 400EX (a.k.a. Sportrax 400EX) is a pure-sport 4×4 responsible for the renaissance of the Sport-ATV segment. Boasting a 397-cc XR400R-inspired engine, Pro-Link rear suspension, 72-mph top-speed rating, and aggressive styling, the quad continues to ride high in today’s ATV market.

By conquering the Baja 1000 out of the gate, the Honda 400EX bravely put an end to the aftermath of the 1988 Consent Decree, eventually paving the way for 450-cc racing quads that we know of today. Continue reading this guide and learn more about the specs, notable features, and how this ground-breaking machine changed the sport-ATV scene forever.

The 2004 Honda Sportrax® TRX 400EX

The 2004 Honda 400EX is the 6th installment of the 400-class Sportrax lineup first introduced in 1999. Although not as powerful as present-day 450-cc speedsters, this pure-sport machine was responsible for the resurgence of sport-quad racing shortly after the 10-year ATC Ban suffered by manufacturers across the globe. In a big way, the Sportrax rekindled the riding community’s then waning desire for sport riding.

The Game Changer

While most companies were cautious not to trigger another Consent Decree, Honda was busy cooking up the next-generation 4-stroke ATVs. Sure, 2-strokes were still widespread in the market. But if the Japanese firm learned anything from the past decade, vehicle regulations will only get stricter and competition only tighter.

With these new challenges in mind, Honda decided to address the consumer’s pent-up demand for a new machine that could satisfy the whims of thrill-seeking racers as well as recreational riders. And since the XR400R received such critical acclaim, Honda decided to use its powerplant as the heart of the TRX 400EX. Conquering the Baja 1000 fresh from the warehouse further proved how well this engine worked with a redesigned ATV framework.

2004 Honda 400EX Specs & Features

Engine

A 397-cm3 (24.23 in3) RFVC air-cooled single-cylinder 4-stroke engine with a bore-stroke ratio of 85 × 70 mm (3.35 × 2.76 inches) brings the Sportrax TRX400EX to life. A 38-mm piston valve with an accelerator pump handles the air-fuel mixture and mates to a compression ratio of 9.1:1 and dry-sump lubrication.

Thanks to RFVC (Radial Four-Valve Combustion Chamber) and an XR400R-adopted power mill, the 2004 Honda 400EX supports a top speed of 72 mph (116 km/h) and a horsepower of 28 RWHP (20.59 kW). Some find the machine’s low-end torque lacking, but changing ratios to 14/38, 15/39, or 14/39 and adding a Dynatech CDI box would give you the pull you need.

Fuel & Lubrication

Fuel tank capacity is 2.64 US gallons/10 liters (inclusive of a 0.42-US gallon/1.6-liter reserve) of unleaded gasoline with a minimum PON 92 rating, containing < 5% MTBE (Methyl Tertiary Butyl Ether), < 10% ethanol, or < 5% methanol. As for engine oil, Honda recommends 1.7 liters (1.8 US quarts – after draining) of SAE 10W-40 oil or its equivalent. For top performance, use Pro Honda GN4/HP4 motor oils with an API grade of SJ+ (without graphite or molybdenum additives) meeting JASO T903 MA standards. To avoid pinging or spark knock, never use lower-octane gasoline. Although slight pinging should be no cause for worry when riding your 2004 Honda 400EX up a hill or under a heavy load. But if it occurs under normal riding conditions and at steady engine speeds, change fuel brands at once. Consult a professional mechanic if engine pinging persists. Drivetrain A 5-speed constant-mesh transmission and a cable-operated wet, multi-plate clutch assembly (with a 1-N-2-3-4-5 gearshift pattern) deliver power to the ground. A DID520V6 or RK520 (view on Amazon) SMOZ10S O-ring sealed chain (120 links + joint) handles wheelspin. It has a gear-driven counter-balancer that reduces engine vibration and lends to its smooth operation. Plus, dual intake/exhaust ports enable optimal engine efficiency in more aggressive riding conditions. As for the reverse, this feature was introduced in the Sportrax in 2005, alongside other powertrain upgrades. Primary Reduction Ratio 2.826 (23/65) Final Reduction Ratio 2.533 (15/38) Transmission Gear Ratio – I 2.917 (12/35) Transmission Gear Ratio – II 1.938 (16/31) Transmission Gear Ratio – III 1.474 (19/28) Transmission Gear Ratio – IV 1.182 (22/26) Transmission Gear Ratio – V 1.000 (26/26) Controls Most of the controls, such as the clutch and parking brake levers, start button, headlight/dimmer/engine stop switches, are near the left handgrip. Similarly, the fuel valve, choke lever, and gear pedal are on the left side of the engine. Meanwhile, the front brake fluid reservoir, front brake, and throttle levers are near the right handgrip. The neutral indicator lamp and ignition switch are on the center console, above the fuel tank cap. Ignition An electric starting system and an ICM (or Ignition Control Module) breathe life into the 2004 Honda 400EX. A single-phase (SCR shorted, full-wave) output alternator with a rated output of 0.147 kW @ 5,000 RPM serves as the quad’s charging system. It requires an NGK DPR8Z or Nippon Denso X24GPR-U spark plug with a 0.6–0.7 mm (0.024–0.028 inch) gap and a 12V 8Ah/(10 HR) YTX9-BS battery (view on Amazon) with assembled dimensions of 150 x 87 x 105 mm (6.00 x 3.44 x 4.19 inches) to power electronic accessories. Tires & Brakes Stock rubber consists of 22 x 7-10 M/R 101 front and 20 x 10-9 M/R 501 rear Ohtsu radial tires with a 4/110 bolt pattern. These knobbies are mated to all-wheel-drive hydraulic discs (174-mm dual front discs and a single 220-mm rear disc) with brake calipers on all fours, which provide the four-wheeler its stopping power. Front tires are mounted on 10 X 5.5 AT mags, while rear ones are on 9 X 8.0 AT rims. Front and rear cold-tire pressure recommendation is 27 kPa (0.275 kgf/cm2, 4.0 psi) ± 15%. Never go beyond the range of 23 kPa (0.235 kgf/cm2, 3.4 psi) to 31 kPa (0.315 kgf/cm2, 4.6 psi) when airing down or inflating your tires. Regularly inspect tread wear and replace your tires when the tread depth is at least 3/16 inches (4.0 mm). Suspension Enclosed in a tubular steel frame with removable subframe are independent, front double-wishbone with 5-way preload-adjustable Showa shocks and Pro-Link rear swingarm with a fully adjustable Showa mono-shock. Each setup offered wheel travel of 209 mm/8.2 inches (front) and 230 mm/9.1 inches (rear). The wheelbase is 48.4 inches (1,230 mm), while the minimum ground clearance is 4.3 inches (110 mm). The turning radius is 3.2 meters/10.5 feet. 2004 Honda 400EX parts such as the cast-aluminum rear swingarm and piggyback Showa shocks lend to the quad’s impressive ride quality and durability. Likewise, its aluminum wheels and knobby tires make for reduced unsprung weight, improved grip, and tighter cornering. As if these positives were not enough, succeeding-year models saw further suspension upgrades. Dimensions The 400EX’s overall dimensions are 72.2 x 45.3 x 43.7 inches (1,835 x 1,150 x 1,110 mm – L x W x H). Seat height is 810 mm/31.9 inches, and footpeg height is 353 mm/13.9 inches. Dry weight is 170 Kg (375 lbs.), while GVWR (Gross Vehicle Weight Rating) is estimated at 288 Kg (635 lbs.) – inclusive of a full tank and the vehicle’s maximum load capacity of 110 Kg (243 lbs.). Exterior The Sportrax is at the receiving end of new Team Honda-inspired graphics and made available in red, yellow, and black 2004 Honda 400EX plastics. An aggressive front cowl, narrow saddle seat, and high-clearance fenders add to the four-wheeler’s pure-sport ergonomics and design. Furthermore, heavy-duty urethane skid plates protect the wheeler’s engine casing and brake disc/sprocket at the back. Cost of a 2004 Honda 400EX The list price of the 2004 Honda TRX 400EX is $5,299, increasing by only $600 in 2009. This price is considerably more affordable than the 450-class counterparts of the 4×4. The Sportrax did not have any limited-edition trims for that year, which meant its value stayed the same regardless of its body color. Conversely, auction listings range from $1,500 to $7,499. Most of these units have tons of extras and are found in California, Arizona, and Canada. Preloved quads within the $2,000-$3,500 range typically come with aftermarket parts like Alba Racing pipe, paddle/dirt tires, K&N filter, Nerf bars, and new seat cover. There are also rare (but pricier) finds that have only one or two former owners. Sportrax 400EX Common Problems Known issues with the 2004 Honda 400EX are similar to other ATVs and include problems with the transmission or engine, fuses, and tires. You can find solutions to these incidents in your service manual. But if you do not have one yet, let this section serve as your reference: Starter Motor Doesn’t Work One of four things could be responsible for this issue and are worth checking – all of which are electrical components. The most common culprit is non-working ignition or engine stop switches, followed by a corroded or defective battery. Usually, owners discover problems with the fuse and starter motor last. In some instances, it could also be due to something as simple as not being in neutral when working the gears. Engine Won’t Start You may notice that your starter motor is attempting to turn your engine over, but the latter won’t budge. At this point, your problem may be coming from a flaw in one of your electrical or fuel system components. Inspect that your spark plug and battery have not come loose and your battery is sufficiently charged. If these check out, then you are most likely experiencing engine flooding or running out of fuel. Pinging / Rough Idling While slight pinging is acceptable under heavy load or on steep inclines, it should not occur anywhere else. If it does, you will have to either adjust the idle to spec or change your fuel to a manufacturer-recommended variant. More often than not, these steps resolve minor engine noise problems. Otherwise, consult the nearest dealer to have a quick look at your quad. Flat Tire Getting your tires punctured or damaged cannot be helped, especially since the 2004 Honda 400EX is sought for racing applications. If so, a makeshift fix would be to plug the punctured area of the tire until you can have it permanently repaired or replaced. Depending on the severity of the damage, you may need to replace your rims as well. Under no circumstances should you continue riding on a flat tire, lest you run the risk of a crash. Blown Fuse Checking your fuse the moment any of your electrical components stop working is a given. It is the first thing to inspect before looking elsewhere in your four-wheeler. You can access your fuse by removing the seat and fuse case cover. Just make sure to turn your ignition switch off before looking at your fuse to avoid an accidental short circuit. Other than the challenges mentioned above, the clutch and gearbox can prove problematic, especially for heavily modded units, turning out to be the Sportrax’s weakest points. The OEM head can also be severely damaged and may require re-plating or a complete replacement. About Honda Honda Motor Company Ltd. is a world-renowned pioneer of the ATV and motorcycle industries and the brains behind the 2004 Honda 400EX. Headquartered in Minato, Japan, Honda is highly regarded for its prowess in automotive engineering, artificial intelligence, and aerospace – ventures the company entered into only in the last four decades. Internal combustion engines particularly speak of the company’s humble beginnings. Conclusion – 2004 Honda 400EX Review The 2004 Honda 400EX held a lot of promise when enthusiasts had hoped the quad received more upgrades to make it GNCC-competitive. Unfortunately, that did not happen as its design remained virtually unchanged until its final year. However, to describe the Sportrax 400EX as lackluster would be a stretch. Its inability to dominate the motocross racetracks does not make the 400EX any less of an award-winning sport quad. Nor does the lack of race-worthy upgrades undermine its capabilities off-road. If anything, it is these inadequacies that make it more endearing and notable. What’s there not to love about an imperfectly perfect quad?

2014 Honda TRX400EX Price

Suggested List — The manufacturer’s (distributors) highest suggested list price in the U.S.A. when the unit was new. Unless indicated, the suggested list price does not include destination charges, dealer set-up, state or local taxes, license tags or insurance.

Low Retail Value — A low retail unit may have extensive wear and tear. Body parts may have dents and blemishes. The buyer can expect to invest in cosmetic and/or mechanical work. This vehicle should be in safe running order. Low retail vehicles usually are not found on dealer lots. Low Retail is not trade-in value.

Average Retail Value — An average retail unit should be clean without obvious defects. All rubber and cables should be in good condition. The paint should match and have a good finish. All lights and switches should work properly. The mileage should be within or slightly higher than the average range. This unit should also pass any emission inspection.

Note: Vehicles/Vessels in exceptional condition can be worth a significantly higher value than the Average Retail Price shown.

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