I think my tractor jumped time, won't run, pulled head, all valves check good. Exaust sucks my hand in on one cylinder. Checked for timing marks in Bell housing at flywheel, couldn't find any. I can find marks on Damper pulley, but can't find any marks on front of engine. Haven't got the radiator pulled yet, they didn't design this to be worked on easily. Anyone know where the timing marks are, and is it gear driven or chain? Is there a adjustment or does it have to be replaced? I got the tractor cheep, but it's beginning to be a pain!