2003 Yamaha YZ250F Competition Model

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4Strokes
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2003 Yamaha YZ250F Competition Model

Postby 4Strokes » Thu Sep 21, 2017 10:08 am

03yz250f.jpg
2003 Yamaha YZ250F Competition Model

So revolutionary no one has attempted to enter the arena in which the YZ250F is king. Moving into its third year of domination, the YZ250F has developed an astounding following and caused quite a commotion. Some think it's an unfair advantage with its unmatched competition, unmatched fun-factor and two Supercross championships - the YZ250F is the bike on the 125cc race circuit today.

At 250cc the YZ250F is legal in the 125cc class, because it's a four-stroke. The larger motor and additional power gave the bike an advantage. But, in a sport where light and nimble are two important factors, extra power isn't always a blessing as four-stroke were known less responsive, heavier handling bikes than their two-stroke counterparts. Enter the YZ250F, shattering the technological walls and combining the best of both worlds. As just 208 pounds (dry weight), the 2003 YZ250F has a narrower chassis and offers quick, responsive similar to a YZ125 or YX250 two-stroke.

The engine is the heart of the YZ250F gem featuring an ultra-trick, titanium, five-valve, liquid-cooled, four-stroke powerplant capable of turning out an eye-watering 13,500 rpm's. The DOHC 249cc powerplant features a bore and stoke of 77mm x 33.6mm with a compression ration of 12.5:1. Power is supplied via a Keihin 37mm FCR flat-side carburetor with Throttle Position Sensor ensuring precise air/fuel mixture and quick throttle response.

Harnessing the power under increased loads, the YZ250F's five-speed transmission has superb gear-shifting operation via an involute-spline transmission. This, combined with Yamaha's exclusive "works-style" adjustable clutch allows the YZ250F pilot smooth yet durable clutch action.

The YZ250F features a removable aluminum subframe, and as if last year's YZ250F wasn't light enough; the weight is reduced by more than six pounds for 2003. The 2003 model also features all-new bodywork with a flatter seat, fuel tank and radiator shrouds for a more aggressive riding position and optimal rider movement. This is vital in turns where you want your weight as far forward as possible.

The suspension of the YZ250F also receives improvements for 2003 for additional support when landing those long double jumps. The all-new tapered rear swingarm features less weight and greater rigidity for a more compliant rear suspension. In addition, the rear shock has a fully adjustable compression damping adjuster that allows the rider to dial in his suspension to meet the ever-changing track conditions on race day. The front suspension features an inverted telescopic fork and a lightweight aluminum piston rod for smoother suspension characteristics.

Its power and lightweight may be the highlights, but YZ owners will be equally impressed with the 250F's front and rear brake set up. All-new front and rear master cylinders and calipers combined with a "floating" 250mm front and 245mm rear discs provide excellent stopping power and increased controllability. Yamaha's lightweight hub, aluminum spoke nipples and Dunlop 739FAs complete one of the most aggressive rear setups on a production machine today.

The 2003 YZ250F is available in Team Yamaha Blue/White and will arrive at dealerships nationwide in September 2002. The manufacturer's suggested retail price is $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
Carburetor: 37mm Keihin FCR flat-slide w/throttle position sensor

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

Chassis Specifications
Front suspension: 46mm Kayaba inverted telescopic fork, 11.8" travel; adj. compression & rebound damping
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

Capacities
Fuel tank: 1.8 gallons

Dimension and Dry Mass
Overall length: 85.1"
Overall width: 32.5"
Overall height: 51.2"
Wheelbase: 58"
Ground clearance: 15"
Seat height: 39.3"
Dry mass: 208 lbs.

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4Strokes
Site Admin
Posts: 1236
Joined: May 02, 2016

New for the 2003 Yamaha YZ250F

Postby 4Strokes » Mon Dec 04, 2017 1:38 pm

  • Total weight of bike reduced by more than six pounds.
  • All-new bodywork with a flatter seat, fuel tank and radiator shrouds for a more aggressive riding position and optimal rider movement.
  • All-new tapered rear swingarm features less weight and greater rigidity for a more compliant rear suspension.
  • All-new front and rear master cylinders and calipers combined with a floating 250mm front and 245mm rear discs provide excellent stopping power and increased controllability.


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