if you had to extend the tensioner bolt, youre asking for major problems. youre wraping the chsin way to far around the gears, your pretty much hurting yourself. one tooth on top is the same as i belive 2 or 3 on bottom. evr grenade a chaincase with 150 hp or more. its not pretty. do it right, buy the chain you need. itll save alot of headaches
If you look at the gearing chart you will see that the same pitch of chain is used from 18/35-21/35. The bolt just needs to be a tad longer on the 18. Anything less then you need a different pitch chain. I might still have the chart around here if you would like me to take a picture. I've never had a single chaincase problem, and only have blown one belt in 18k miles with Ultras.
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