08 yz450 rode without antifreeze not idling

i raced my bike for two hours it turned off on me water seal blew replaced seal shimed vavles new pilot screw new fuel screw runs good when cold when hot turns off and wont idle starts right up cold or hot please help thanks

Try adjusting fuel/air screw, did you put the little clip on the needle in the right groove?Also check for vacume leaks

Edited by Michael45

Without coolant to cool it relies only on the oil to cool which is not efficient. Soon the oil cant cope and metal parts start scoring. I bet there is significant scoring and damage to all the top end parts.

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