WTF happened

[Tony]

Ok, I just got in from a ride on my mini bike. I was going down the road and i heard a noise, it sounded like the chain poped off. (It didn't but i think it hit a mount support.) Anyways i started it up to continue my ride when I noticed I was going really slow, probly about jogging speed. I turned off the engine and the chain was a bit looser (but still doing its job.) Then it wouldnt start. I had to hold the throttle down a bit to get it started. And now it is idling way slower and I did not mess with the carb. Any ideas on what could of happened?

 

[pmat]

burnt out clutch?

 

[Tony]

i dont think so because it idles way lower now too.

 

[Affair_driven]

Bring piston up to tdc and rock flywheel back and forth and feel for looseness or listen for unusual noises. This should tell you if bearings have failed. Possibly a broken rod cap? It's possible flywheel key has sheared.
Without hands-on, difficult to tell.

 

[Tony]

could be... i'll take a look tomorrow. The engine mounts were a bit loose also...

 

[Kaptain Krunch]

Yea i would definatly check the flywheel key, i cant tell you how many free engines i've gotten because someone broke the flywheel key and didnt know why the engine wouldnt start. I got one really nice rider just because they hit a rock and stalled it, then it wouldnt restart.

 

[Tony]

it will start just idles way slower now and it isnt reving as high now.

 

[Kenny_McCormic]

Key retarded timing.