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'03-4: good power, higher compression, good steel frame, terrible forks. Funky CDI issues on all bikes. '03 sheared woodruff keys if you did not fix it asap.'05-06: softer power, lower compression, '04 YZ forks (bigger and better), and CDI issues mostly resolved'07 on: gearbox upgrades, cam chain upgrades, allow frame, motor tilted back 3 degrees, narrower plastics and seat, better overall feel. Suspension travel lower 10mm to lower seat height.'07 is the way to go. Feels lighter, much better forks, cleaner/smoother running motor.
'03-4: good power, higher compression, good steel frame, terrible forks. Funky CDI issues on all bikes. '03 sheared woodruff keys if you did not fix it asap.
'05-06: softer power, lower compression, '04 YZ forks (bigger and better), and CDI issues mostly resolved
'07 on: gearbox upgrades, cam chain upgrades, allow frame, motor tilted back 3 degrees, narrower plastics and seat, better overall feel. Suspension travel lower 10mm to lower seat height.
'07 is the way to go. Feels lighter, much better forks, cleaner/smoother running motor.
