Hey guys so I bought a 2010 yz450f for a fairly low price. Being aware there may be issues. I’m not experienced when it comes to dirt bikes so was looking for a solid bike to learn so things with. That being said, the guy I bought it from said there was a high compression piston installed and no pressure release. Also he said it has to be kicked once to “charge” it then pull up until there’s compression and kick. I’m having difficulty getting the bike to turn over at all. However if I bump start it it will turn over almost instantly and run smooth. I watched him kick it over but having troubles myself. I don’t know why or what causes it. I thought about changing the spark plug, the air filter which is really bad, and also needed a new kick starter because the one on it is beat to hell. But I am not experienced and don’t know what to look for and was hoping you guys could help. Please and thank you.