1981-1984 Official Honda ATC250R Shop Manual, Page 86Get this manual
K ICKST ARTERTRANSM ISSIONCRAN KSHAFT
ATC 250R
UNIVERSAL HOLDER
CRANKCASE SEPARATION
Remove the engine from the frame (Page 5-2)Hold the drive sprocket with universal holderRemove the fixing plate bolts, plate and sprocketNOTE If the sprocket needs to be replaced, replace both the sprocket and fixing plate as matched setReplace both drive and driven sprockets as set, and the drive chain
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