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2009 kx250f starting trouble. HELP?!

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I just completely rebuilt my top-end, put pro-ex valves and springs, oem piston and an oem cylinder. So we go out to start it, and it will not fire up, also it backfires sometimes when we try to kick it over. Any help would be greatly appreciated.

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Thanks for the help! We found out that the bike keeps skipping timing, after the 2nd time we found that out.

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