'08 Yamaha Dirt Bikes Reviewed

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'08 Yamaha Dirt Bikes

YZ450F/YZ250F
First up in the '08 Yamaha dirt bikes range is the YZ450F. There have been some engine changes for this year, the intake ports have been changed and there are also modifications to the cam profiles to boost torque and improve throtttle response in the low to mid range.

The bike has a new larger diameter titanium exhaust header with a changed taper to improve efficiency. The muffler has been modified to reduce length and weight but still meet AMA regulations.

There's a new brake caliper up front, similar to the YZ250F, and a lighter brake disc to reduce unsprung weight.

'08 Yamaha YZ450F

'08 Yamaha YZ250F

The YZ250F has had changes made to the piston shape, increasing the compression ratio, and there's been revisions to the ignition and carburetion to suit.

The 250F and the 450F have matte black finish crankcase covers.

Both bikes again come standard with Pro Taper bars and Excel rims for 08.

YZ125/YZ250
The two strokes for '08 haven't received much in the way of updates this year, both bikes have a YZ250F style front brake caliper which is 220 grams lighter, a wave style front disc and new master cylinder.

The fork protectors and axle bracket are both lighter as well, reducing unsprung weight and improving front suspension performance.

They both come standard with titanium footpegs and Pro Taper bars.

'08 Yamaha YZ250

'08 Yamaha YZ125

At 190lb (86kg) dry for the 125 and 212lb (96kg) for the 250, both senior two stroke bikes are lightweight, cheap to maintain (ask anyone who has paid for a four stroke rebuild compared to a two stroke) and are great value for money.

YZ85
Not a whole lot has changed on the baby of the '08 Yamaha dirt bikes for this year. The 85 has a lightweight semi-double cradle steel frame, digital CDI ignition just like the bigger race bikes and compression and rebound adjustable forks and compression dampening adjustable rear shock.

'08 Yamaha YZ85

(photos courtesy of yamaha-motor.com)

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