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[4Strokes]

2004 Yamaha YZ250F Competition Model

Not so many years ago they would've locked you up for suggesting a four-stroke single could spin to 13,500 rpm and produce a broad torque band the whole way there. It would have been unthinkable to conjecture that such a machine could win back-to-back AMA 125 Supercross Championships, not to mention a slew of magazine shootouts-including top honors in Dirt Rider, Motocross Action and Cycle World last year alone.

The YZ250F did all those things right after kicking free of its crate; for 2004 it's back and badder than ever.

Mere details. The important thing is that even with all its high-tech trickery and sharp competitive edge, the YZ250F is a blast to ride, even when you're only racing yourself. Suggested Retail: $5,599 USD.

Engine Specifications
Type: 249cc, 5-valve (titanium) liquid-cooled, DOHC, four-stroke
Bore & Stroke: 77 x 53.6mm
Compression ratio: 12.5:1
Ignition: Digital CDI
Carburetor: 37mm Keihin FCR flat-slide w/throttle position sensor

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

Capacities
Fuel tank: 1.8 gallons

Dimension and Dry Mass
Overall length: 85.1"
Overall width: 32.6"
Overall height: 51.3"
Wheelbase: 58"
Ground clearance: 15"
Seat height: 39.2"
Dry mass: 208 lbs.

Chassis Specifications
Front suspension: 48mm Kayaba inverted telescopic cartridge fork, 11.8" travel; adj. compression & rebound
Rear suspension: Fully adjustable Kayaba shock, 12.4" travel; separate Hi/Lo compression adjustments
Front brake: 250mm floating disc
Rear brake: 245mm disc
Front tire size: 80/100-21 Dunlop 739
Rear tire size: 100/90-19 Dunlop 739

[4Strokes]

• A bigger, 48mm fork with revised internals for a smooth, compliant feeling throughout the stroke, while a special new coating reduces stiction.
• New anodized triple clamps accommodates the larger forks and give that factory look while carrying the handlebar aggressively low and forward.
• Brake calipers now contain light, aluminum pistons.
• New, titanium foot pegs increase strength, reduce weight, and provide more grip.
• Internal engine mods reduce pumping losses for increased midrange.
• Exhaust flows through an all-new titanium header pipe for relentless power that just keeps building.