New for the 2003 Yamaha WR450F:

• 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.