Racer X Tested: 2008 Yamaha YZ450FMonday, August 13, 2007 | 11:05 AM
In this article…
• Micron-level adjustment of piston external diameter minimizes piston-to-cylinder clearance for reduced vibration and mechanical noise.
• Adjustment of gear backlash between clutch primary gears and balancer gears achieves further mechanical noise reduction.
• A new, larger-diameter titanium exhaust header with revised taper characteristics enhances exhaust efficiency.
• First “punched cone” muffler ever on a production bike allows 35 percent length reduction and 270-gram weight reduction while meeting AMA noise regulations.
• Matte black crankcase covers: light, strong and cool-looking.
• Steering head pipe and steering stem are 5mm shorter; lower forged triple steering clamp is lighter—for enhanced handling feel. Swingarm pivot stiffness is revised to complement front-end changes and further lighten and improve steering/handling.
• Changes to the shape of the outer fork tubes and revised internals result in improved damping and a smoother ride.
• Optimized linkage ratio provides a smoother ride and enhanced rear wheel traction.
• New, YZ250F-style, front-brake caliper (-220 grams) and a lighter disc remove unsprung weight and provide excellent stopping power. A new axle and collar remove additional weight.
• A 120/80-19 rear Dunlop D756 knobby replaces the 110/90-19 for even more traction. A D742FA replaces the D739FAL front tire.
• Wider footpegs provide excellent boot traction and rider comfort.
To see the bike in action and hear more from Nathan go to www.racerxfilms.com.
For a complete evaluation and comparison of the 2008 Yamaha 450, check back in for our annual Racer X Tested 450 Shootout coming soon.
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Troy Lee Designs/Lucas Oil Honda’s Cole Seely is a man of many talents— skateboarding, BMX, import drifting … and he’s pretty good at this motocross thing, too. Page 156 .