I just re-ringed my piston and had my head serviced. After putting it back together, it is having a hard time starting. I'll go through the starting procedures and kick it. The motor sounds like it is about to start, but it never really gets going. I've tried it with and without choke. The fuel valve is turned on. Before I pulled the top end off, it would start on the first kick. I'm getting good compression and everything, it just doesn't seem to want to fire up. Any ideas? edit: I'm running stock WR timing. It's a 2000 WR400F with a 417 kit if that makes any difference to anyone.