That actually makes sense. I could not find broken pieces of plastic anywhere.Don’t worry about the black plastic caps. The holes were put there intentionally just so you can verify they are moving when the engine is running. It won’t affect anything and was pretty common back in the day.
I just bought a 12v one at the electronic store. Looks almost identical to the old one.What beeper did you buy? Some of the cheaper ones won’t sound at the small short pulse the MPEM sends.
When rebuilding 2-stroke motocross bikes, I usually just push or tap the wrist pin out with a wooden dowel. They slide right out easily if the top end bearing isn't mangled.Rebuild kit on order....and the manual looks like it actually does cover off replacing the pistons so I'll give it a shot.
What do I use to get the wrist pin out of the piston without a puller??