i just tried to start working on a 66 BSA lightning motor i bought on ebay. I wanted to take the covers off to see what kind of shape it's in but i can't get the cover off the timing side. it seems to be stuck on the splined shifter shaft. is this a common problem? am i missing something. it should just slip over it right? on the other side i can't get 4 of the cover bolts out either but maybe that just needs some liquid wrench. not a good start so far.