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Kx450f will not start help! Pleease!

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Just put a brand new top end in my bike. 06 kx450f. Had head redone and valves clearances and timing are all dead on carb bowl is not sticking also has fuel and fire. Anybody have any thought??? Anything is helpful at this point

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It needs fuel/air mix, compression, and ignition at the correct time, to run. Which one don't you have? Go back and make sure your cams are timed right would be my first thought, then make sure you have a bright, white, spark. Just any old spark may not be enough to light the fuel under the higher compression of the new top end.

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