What is the stock sprocket size (front and rear) on a '86 250R? And if I run 22" rear Holeshots and 23" fronts will I have to change sprocket sizes? The tires on there now are 18" rear and 22" fronts.And I don't know if it is stock sprocket size now.

 

it all depends on ur personal preferences and riding style

 

with the 22's and the 23's, your best bet to start with is a 13T in the front and a 38T in the back. Some people have been using a 12T in the front because of the larger tires.

 

front stock 13 rear stock 39