So, after having my regular transportation Karmann Ghia smashed up in a wreck, broken the footpeg off my rickman, busted a rear wheel seal on my truck and broken the oil rings on my A50, I decided I needed to pep up the ol' plunger A10 for transportation. The main problem was that it wasn't charging, so I pulled the dynamo, tested it, nothing was wrong so I re-installed. It subsequently started charging again. This was when I noticed that the lower front motor mount bolt was kinda loose...then on further inspection saw that both rear gearbox mount bolts were gone. Well, I thought I'd tighen up the motor mount bolts and install some fresh rear bolts with extra loctite and I'll be good to go. Now, what I can't seem to explain is that, while this thing vibrated before, now it's just absolutely intolerable. All engine mountings are in place, the bike seems to run OK, has lots of power (thought maybe at first it might be on one cylinder) and the vibration goes away at high revs. The motor has maybe 2000 miles on a complete rebuild and was OK before...so my question is, what could make it vibrate so bad? I guess I need to go through timing and valve adjustment, etc., but I don't see how any of those could cause excess vibration.
Any thoughts?