What is the best in depth manual for this machine. I have a Haynes and its not detail enough. Is the Clymer or some other better with exploded views of engine breakdown? Also there is a bearing on the crank on outside of the case between the timing chain sprocket and the starter gear on crank. I have it off and the rollers fall out. So there is no number on the bearing and I can’t find it in the Haynes manual. Anybody who can ID so I can order 1? How much slack in the oil pump drive chain? Hopefully I can find a good shop manual with the overhaul exploded views so its easy to ID. Thanks for any help.