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08 KX450F OVERHEATING/BOILING OVER

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I have a 08 kx450f. I'm having issues with the bike overheating/boiling over almost immediately while trail riding but not as fast as in track. I have checked to make sure I'm not leaking, did a combustion test in radiator, checked propoller/water pump, get proper flow while looking in cap while started, and also verified I do not have a blockage in radiator.. the only thing I am left to think is maybe it's the cap? The guy put a tusk cap with gauge on it. Cap is 1.9. I'm not sure what's going on here though. Any help would be greatly appreciated.. thank you in advance

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