I have a 04 YZ 450. I recently did a top end and added the hot cams and ever since then I cant get the thig too start. Once I get it started it runs great but getting it too start is the hard thing. I have asked some people and they say it could be valve clrearence, timming, bad connection, bad spark plug, or jetting but I dont get it. If once I get it started it runns fine it seems as though it would run shitty if it were any of thoughs. Please help!!!