Yamaha yz 125 engine teardown!

there was some self destruction in this engine.
the crank main bearing seized and broke into little pieces that then got pulled up through the intake port into the cylinder were then the piston drove the little pieces into the cylinder head and scored up the cylinder wall pretty good. also the shifter shaft is bent, the clutch basket is notched and some cracks were found in the casings.
There is a lot that this engine needs !
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[@BrokenSprocket]

Nice job on the teardown I like the different camera angles good job..

[@dirtbikeparadise]

Thanks!

[@jbohler]

Looking forward to this build, I just picked one of these up yesterday, needs some work as well.

[@dirtbikeparadise]

sick!

[@Erik-qx8is]

I think your exhaust valve is broken.. I didn't see one XD

[@dirtbikeparadise]

I didn't take it out of the cylinder head but it is definitely broken😁