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2003 crf450 not starting

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I have a 2003 crf450r and i dont now why its not starting the sparks is strong, the jetting is right, the timing is right, and it was just rebuilt and was running strong for about a month then this happened can any one help.

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I'd check the valve clearance if you haven't done this already. I can't believe how much my valves moved last year, probably from riding the sand dunes all the time. It's hard to keep it all out of the engine, even with religious air filter cleaning.

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I would second that. My valves moved alot when they were stock and then they moved faster after they were rebuilt wrong by a local shop.

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