Had to re-gear the bike today as 8.40 is way too low even with the 18" tire on back. Was 10t clutch, 14t in on JS 10t out, and 60t sprocket for 8.40 to 1. Changed to 10t clutch 14t in 14t out and 60t sprocket, for a final ratio of 6.00 to 1. MUCH better...next is advancing the timing...gotta get a little more!!:shrug: