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Message: [QUOTE="nikki, post: 1392825, member: 18126"] Assuming you had the head off while working on it... might want to pull it again and just check the valve clearances at TDC. We put a top end in my '03 YZ250F once, and had a shim get wedged under the valve cap, and not sit in the groove, and couldn't figure out why it wouldn't start, and finally figured that out. Might not be your issue, but it only takes about 30 minutes to confirm the clearances are in spec... and then you can rule out valve issues for now. [/QUOTE]