RE: Jett 60 issues
Chad,
i hope Bob27 is still around.... haven't seen him in a while
I'm sure he would tell you if the head bolts got loose to check the cylinder liner alignment!
Check the exhaust port opening and make sure it's not "sideways" a bit compared to the cylinder opening.
It's normal during lean run(s) that the head bolts can get loose on ya
If the engine does not experience lean run(s) the head bolts should not loosen once tightened properly