I am finally getting to fix this MC21 that I have had and ridden very little ,the bike has low compression,about 95psi,and the lower cycinder runs intermittently,my Question is if im going to do a top end rebuild ,should i go ahead and take the crank out and put new seals and bearings(providing the crank is good ) on it,and if so could I do all that with the motor in the bike or would it be easier to just take the motor out, I don't have an engine stand, also what order for engine disassembly is easiest ?thanks for any suggestions .