I have a 2001 yamaha warrior YFM350x and started to work on it. The person who I got it from put a new top end kit in it. I already took the top end off and checked, brand new still. Had to clean the valves so it can get better compression. Put it back together and turned it over and and made good compression but also had a loud clanking noise at the bottom, put hand over carb and stopped making the noise when I turned it over. And won't start. I know it is not the top end. Just cleaned it and valves. Need help trying to figure out what's the problem.. thinking it's the crank rod but don't know. If it is the rod can i just get a new rod for it?(would be great if so). Or does it need a hole bottom end . In need of help.