99 yz400f

Hello everyone,

Im new to this site and to four-strokes so take it easy on me. I just recently picked up a clean 99 yz400f. Its in great shape but needs a head gasket. Im most likely going to put a top-end in it while I have it open. Any suggestions on the right top-end kit I should buy. Also I think its a head gasket because antifreeze is getting into the cylinder on the downstroke and getting pushed out the exhaust on the exhaust stroke. If anyone has any advice or good guidance I would greatly appreciate it.



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