Hello all. I am new to the site and have found a wealth of information on Chinese engines. Thank you. Now that I have a pretty good education on the various engines, I just need to conform my thoughts here. I have a 153fmi horizontal engine with a bent crankshaft. I have a 154fmi horizontal engine i was going to pull the crank from to fix 153. 153 would have a 52.4mm bore where 154 is 54mm bore. This tells me the stroke is different which also tells me the crankshaft must be different. Both are 125cc engines. Would I need to swap the jug, head, piston and crank then? Thank for the help.

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