100cc bike engine Mysterious engine failure, nothing broken but piston and cylinder scored .

Engine failure with signs of sucking a piece of metal into the engine but nothing broken nor was anything found and what actually caused the engine failure....HIGH QUALITY CHINESE JUNK...

[@JamesPiccone]

Looks like wrist pin clip failure. Happened to mine also blew out my whole transfer wall, made a video of it.

[@Jarrod_D]

Bet he bought a motorcycle.
I'm going to get a video out tomorrow was two years ago.

[@6mtdrino]

Was the piston right