2002 Yamaha WR426F Competition Model

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2002 Yamaha WR426F Competition Model

Postby 4Strokes » Tue Apr 04, 2017 6:35 am

2002 Yamaha WR426F Competition Model

The term “four-stroke technology leader” is synonymous with Yamaha Motor Corp., U.S.A. Winning virtually every shoot-out and four-stroke award in the industry, Yamaha’s line up is second to none. At the top of Yamaha’s off-road line is the WR426F. Built with the technology of Yamaha’s competition-ready YZ426F, but definitely designed for the tight twists of the woods, the WR426F reigns supreme against its nearly nonexistent competition.

What distinguishes the WR426F from its racing brother is that it’s packed with additional accessories for the rider who chooses the open space over the tight tracks. The WR426F features a 60-watt halogen headlight, a taillight, voltage regulator, tripmeter, 18-inch rear wheel, 3.2-gallon fuel tank, wide-ratio transmission, hand guards and a U.S. Forest Service-approved spark arrestor.

For 2002, the WR426F receives the same updates as its YZ four-stroke brothers. A new, lighter weight rear swingarm improves overall suspension and rigidity balance, which enhances overall rider handling and comfort. A new, rear shock absorber, increased from 487mm to 492mm, adds to the bike’s already plush suspension. Add to that more suspension enhancements such as the new two-piece piston in the front forks for smoother oil flow and the WR426F is fully dialed for some wicked terrain. The forks again feature anti-section dust seals, outer tubes with low friction internals and a lightweight aluminum piston rod for smoother suspension characteristics. The rear shock has an aluminum bearing and Hi-Lo adjustable compression damping allowing the rider to dial in his suspension to meet trail conditions. The WR426F’s braking system also receives upgrades with a larger, 245mm rear disc brake and redesigned rear-brake caliper. A Nissin front master cylinder coupled with a “floating” 250mm front disc and brake pads provide excellent stopping power and increased controllability. Providing superior shifting, the highly acclaimed "three bar" shifting mechanism graces the tranny. Three shift fork guide bars are used to improve the power shift feeling when slamming the gears after a long straight or short shifting the bike out of turns. In addition, the 2002 WR426F features the “works-style” adjustable clutch perch (fully adjustable with no tools!) and lever for better response and superior feel. The 2002 WR426F features a DOHC, five-valve, liquid-cooled, twin-cam motor with titanium valves. A 39mm Keihin FCR, with throttle position sensor (TPS) carburetor is designed to offer even better throttle response in a wide range of conditions. The carburetor features an integrated, red-colored, hot start knob for easier starts when the engine is hot. In an effort to keep weight to a minimum, the WR426F features a removable aluminum subframe. The frame features HT-780 high-tensile steel tubing that is lighter, thinner, yet stronger on the main tube. From the rider’s perspective these advancements translate to a more nimble machine, allowing the rider to carve sharp turns through the woods or quickly avoid those stubborn boulders strewn about the desert trails. Excel rims, previously expensive aftermarket additions, grace the WR426F in the front and rear (as with the YZ125 and YZ250), providing superb strength throughout the season. A light chain, lightweight hub, aluminum spoke nipples, and 18” Dunlop rear tire complete one of the most aggressive rear setups on a production machine today. The 2002 WR426F will be available in Team Yamaha Blue/White and will arrive in dealerships nationwide by November 2000. The manufacturer's suggested retail price is $6,199.

New for the 2002 Yamaha WR426F
- New, lighter weight rear swingarm improves overall suspension and rigidity and balance.
- New, rear shock absorber, increased from 487mm to 492mm.
- New two-piece piston in the front forks for smoother oil flow.
- Larger, 245mm rear disc brake and redesigned rear-brake caliper.

Engine Specifications
Type: 426cc, 5-valve (titanium) liquid-cooled, DOHC, four-stroke
Bore & Stroke: 95 x 60.1mm
Compression ratio: 12.5:1
Carburetor: 39mm Keihin FCR flat-slide w/throttle position sensor

Transmission Specifications
Type: Wide-ratio, 5-speed, multi-plate wet clutch

Chassis Specifications
Front suspension: 46mm Kayaba inverted telescopic fork, 11.8" of travel; adj. for comp/rebound damping
Rear suspension: Fully adj. Kayaba single shock, 12.4" of travel; separate hi/lo-speed compression adj.
Front brake: 250mm floating disc
Rear brake: 245mm disc
Front tire size: 80/100-21 Dunlop
Rear tire size: 100/90-18 Dunlop

Fuel tank: 3.2 gallons

Dimension and Dry Mass
Overall length: 85.5"
Overall width: 32.6"
Overall height: 51.3"
Wheelbase: 58.7"
Ground clearance: 14.7"
Seat height: 39.3"
Dry mass: 240 lbs.

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