It's funny I came across this thread today because I literally just bought a FB Marketplace ms440 last evening on the cheap (175 clams), guy said he got it on a trade and tried to start it and it popped with gas dumped in the carb. He said he had too many projects and wasn't interested in the saw.....
I took it home and as it usually goes I couldn't keep my dickbeaters off of it, tore straight into it, had a heck of a time getting the clutch and worm drive off of it, and discover this......zoom in on those pics at that crankshaft......
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Yes, those are spot welds directly on the crankshaft, right where the bearing spacer should be.....lmao.....all the way around.
No bearing spacer (hence absolute no sealing surface for crankcase vacuum, which is why the saw wouldn't run). Who TF does sh*t like this???
From what I can gather, the prior "mechanic" lost the bearing spacer and figured a few spot welds to jam the clutch in the approximate location it needed to be would do the trick.....the plastic worm was TRASHED!!
I've gotten the crankshaft cleaned up, seals and spacer ordered and on the way, along with a carb kit......definitely one of the crazier hack jobs I've seen in a while!!