X-PRO^® 37 Teeth 420 Chain Rear Sprocket for Dirt Bike
[253-999006]

Very good, please advise anyone with a 200 CC Chinese enduro to purchase this sprocket. You have to put it in a vice and drill out the holes a little larger to fit, then take out five chain links. After that the bike will still have enough power, but will cruise comfortably at 55 at 6000 rpms.