well we took the flywheel off and really didnt see anything out of the ordinary -- put it back on after a good cleaning with a good dose of red locktight-- how tight should the big nut be before cranking on the 2 clamping bolts? i had it toooo tight and it wouldnt turn over so i backed it up a bit then cranked on the 2 new fine threaded bolts-- 170 lbs torque on the clamping bolts with a little oil on them -- we thought we would let it set till monday before cranking it up to see if it still knocks -- note one question in this message and tell me what ya think! thanks for the help so far-- Roys Toys