2003 Yamaha WR450F Competition Model

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4Strokes
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2003 Yamaha WR450F Competition Model

Postby 4Strokes » Thu Sep 21, 2017 10:17 am

03wr450f.jpg
2003 Yamaha WR450F Competition Model

Yamaha’s off-road line up is second to none. At the top of Yamaha’s off-road line is the all-new WR450F. Building on the success of last year’s WR426F, this year’s model offers more power — go figure. Adding 24ccs to the already potent thumper, the 2003 WR450F also features an all-new electric start making riding as easy as it is fun.

What distinguishes the WR450F from its racing brother is that it’s packed with additional accessories for the rider who chooses the desert and woods over the tight motocross tracks. The WR450F features a 60-watt halogen headlight, a taillight, voltage regulator, tripmeter, 18-inch rear wheel, 2.6-gallon fuel tank, wide-ratio transmission and a U.S. Forest Service-approved spark arrestor.

Powering the WR450F is a 449cc, 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. All new for 2003 is the push-button electric start system, which means all you have to do is push the button and go! The carburetor features an all-new hot start system with a handlebar-mounted lever for easier restarts when the engine is hot.

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 WR450F features the “works-style” adjustable clutch perch (fully adjustable with no tools!) and lever for better response and superior feel.

Woods riders will enjoy the updated suspension system, making their tight, pounding rides as comfortable and responsive as possible. An all-new tapered swingarm is offers more rigidity for more compliant rear suspension. Additional refinements to the rear shock’s Hi-Lo adjustable compression also make the ride as smooth as possible while carving through the woods.

The WR450F’s braking system also receives upgrades with all-new, lighter-weight front and rear master cylinders and calipers, combined with a 250mm floating disc up front and 245mm disc in the rear. The new breaking system delivers strong, consistent stopping power.

The WR450F features a removable aluminum subframe, which allows for easy maintenance. 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 grace the WR450F 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-inch Dunlop rear tire complete one of the most aggressive rear setups on a production machine today.

The 2003 WR450F will be available in Team Yamaha Blue/White at a manufacturer's suggested retail price of $6,299 USD.

Engine Specifications
Type: 449cc, 5-valve (titanium) liquid-cooled, DOHC, four-stroke
Bore & Stroke: 95 x 63.4mm
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" 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
Rear tire size: 110/10-18 Dunlop

Capacities
Fuel tank: 2.6 gallons

Dimension and Dry Mass
Overall length: 85.4"
Overall width: 32.5"
Overall height: 51.2"
Wheelbase: 58.4"
Ground clearance: 14.6"
Seat height: 39.2"
Dry mass: 240 lbs.

Related Article: Four-Stroke 400 vs 450 Horsepower Comparison

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4Strokes
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Posts: 1238
Joined: May 02, 2016

New for the 2003 Yamaha WR450F

Postby 4Strokes » Mon Dec 04, 2017 1:16 pm

  • Adding 24cc's to the already potent thumper.
  • All-new electric start making riding as easy as it is fun.
  • All-new hot start system with a handlebar-mounted lever for easier restarts when the engine is hot.
  • An all-new tapered swingarm is offers more rigidity for more compliant rear suspension.
  • Refinements to the rear shock's Hi-Lo adjustable compression also make the ride as smooth as possible.
  • Braking system upgrades with all-new, lighter-weight front and rear master cylinders and calipers, combined with a 250mm floating disc up front and 245mm disc in the rear.


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