Stella 2T Postmortem, Part 2

"Decay buys too many beaters" (decay) 10/08/2018 at 12:46 • Filed to: Decay's Beaters, Two Wheels Bad

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(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.

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.

Pretty obvious something here got hot.

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.

nerd_racing > Decay buys too many beaters 10/08/2018 at 12:51

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is that a roller bearing crank? 

Decay buys too many beaters > nerd_racing 10/08/2018 at 12:52

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Yes

farscythe - makin da cawfee! > Decay buys too many beaters 10/08/2018 at 12:56

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welp... theres your problem

engine doesnt appear to be attached to scooter

Decay buys too many beaters > farscythe - makin da cawfee! 10/08/2018 at 12:58

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Dang! Why didn’t I think of that?

farscythe - makin da cawfee! > Decay buys too many beaters 10/08/2018 at 13:02

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sometimes little things like that just go unnoticed... happens to all of us

nerd_racing > Decay buys too many beaters 10/08/2018 at 13:09

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You might need some heat to get those pins out, Whole crank is pressed together.  

Decay buys too many beaters > nerd_racing 10/08/2018 at 13:12

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Generally the crank and rod are sold and replaced as a unit. Right now the clutch requires a special socket for removal, then I should be able to free the crank. Once I get that out, I should be able to press it apart.

.. If I don’t decide to make it a sweet desk toy instead :P