I have owned 99, 01, 07, and 2011 gassers all used the same rear sprockets. All gassers (except trials and the ec 125) use the same front sprocket. The ec125 front sprocket is probably the same as a Yamaha yz 125. I have used a suzuki 250 rear sprocket (91-93 DR 250/350 but must be the "s" model - regular dr 250 won't fit).
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