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MC91B1 rod, piston, wrist pin assembly
#5
OK, this is getting too complicated. So I put that engine aside and will deal with it later. After all I have two more in the basement. So I start taking one apart and find that it's extensively modified (port work, full circle crank, cuts in the piston skirt, etc.), the very definition of "Stock appearing". Now I remember buying it but never running it. Put that one aside. Maybe if we do another Thompson style test day I'll get it going and see if it'll run. OK, last chance. Took that one apart and everything looks good so far (ran out of time, dinner with the in-laws).

Anyway guys, thanks for the input. I'll find someone to change the rod for me, that's assuming I can find a usable one in my pile of junk. Got to find a crank too. The rod journal on this one is pretty badly rust pitted (that may explain the cracked cap). Is it possible to polish out the pits and fit larger needles?
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RE: MC91B1 rod, piston, wrist pin assembly - by Bill Peck - 06-23-2017, 05:11 PM

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