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Stella 2T Postmortem, Part 2

(Part 1, here)

Finally got the puller tool I’d been needing to split the cases and take a look inside at exactly where the motor failure happened.

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Illustration for article titled Stella 2T Postmortem, Part 2

I got the flywheel off and proceeded to split the case. This gave me my first good look at the crankshaft, where I’d assumed the failure had started.

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Illustration for article titled Stella 2T Postmortem, Part 2

Pretty obvious something here got hot.

Illustration for article titled Stella 2T Postmortem, Part 2

The rod is still completely frozen to the crank, so I assume these surfaces got hot enough to friction weld to each other. I wanted to tear down further, but another specialized tool is required to actually take the crankshaft out of the case. Unfortunately, amazon doesn’t stock specialty tools for 2 stroke vespas, so I’ll be waiting another couple of weeks before I can take everything apart fully. I really want to find the bearing that came apart and sent shrapnel into the top end. 

FWIW, I already ordered a whole new engine assembly, so at this point I’m going to continue tearing this one down simply to satisfy my curiosity. Hard to argue with $650 shipped for a brand new motor.

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Illustration for article titled Stella 2T Postmortem, Part 2

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