Problems with my GO B21 nitro engine.
 

Hi guys I need some help figuring out what is wrong with my nitro engine. As it says in the title I have a GO B21 engine. I was running my truggy and it decided to just quit on me. When i tried using the pull start on it to start it up the engine didn't turn over... the pull start is fine and the piston is now fine too (it wouldn't turn all the way over, but i fixed it). So i was just wondering why the one way bearing won't turn over the engine?

Please leave some tips and advice. thank you.