I had a call reguarding 550 diesel crankshaft. Parts numbers look the same for diesel and gas engine . Hercules in Toronto has a crank that measures up but has no counter weight . It's been 8-10 years since I have done 550 so can't just visulize it but I advised not to go with that crank. Can you shed any light on this ? thanks Grant     <!-- e --><a href="mailto:thedesolivers@bmts.com">thedesolivers@bmts.com</a><!-- e -->