Bought B8200HST at auction would not start what I have done so far is compression test was at 50# or so all 3 cylinders . I removed head, oil pan, and pistons found center piston had broke top ring which had worn ring groove. Replaced the one piston and installed new rings all cylinders (where I messed up is didn't verify ring end gap my bad). Reassembled and still 50# all 3 cylinders, decided to bite the bullet and have re sleeved when was tearing down found that cam and inj. gear timing marks do not mess appear 1 to 2 teeth off with crankshaft dot straight up(can never get all marks messed no matter what), this is every 3 revolutions that is as close to matching as they get. Would this cause me to loose that much compression as in valves open too soon? The other question is when I pulled the crankshaft V belt drive pulley I didn't know there wasn't a master spline or key but pulley is balanced how does it install and in relation to what? I believe the flywheel is drilled in a pattern that only matches up one way. Could really use some advise Bought a manual on Ebay for the tractor it includes everything but the engine wouldn't you know it?