Maintenance & Technical > KDX (KX step child)

KDX Leakn Head Gasket

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Hillclimb#42:
Very Good tips. Thanks Guys. Sounds like a plan. Also talked to Freddette. he said that was a common issue with the ol' air cooled KDX's. He suggested running the bike without the head stay. Said that he had no trouble with his air cooled heads after running them without the head stay. 

Friar-Tuck:
Hey HC, that guy is like a quiet super hero,
(list of accomplishments http://www.frpoffroad.com/aboutus.htm#aboutus )  very cool you were able able to speak to him!
  More insider secrets, (run the air cooled bike without the head stay)...
Thanks for posting the results of the conversation.
 Tuck \o/

wierdo:
Hillclimb, you might want to have a real good look at the cylinder studs where the leak is coming from. I recently had an issue with a leak at the RH side of my kx500's head, tried all the bonding agents, lapped both surfaces and cometic gaskets but still leaked.
the studs torqued up fine, but after start up and a couple of revs would start to leak again, so after pulling apart a couple of times the stud broke off in the barrel, turns out that the stud closest to the leak had stretched slightly, and when i looked at the rest of the studs 2 more were in the same condition.
I replaced all the studs and  while torqueing down the same 3 stud holes pulled they're threads.
I installed time-serts into the barrel with the new studs, a lick of permatex aviation gasket goo onto the metal head gasket and haven't had a leak since.
If it wasn't for the stud breaking i wouldn't have found the source of the problem, and after the third teardown i was really getting P O'd with it all.
Hope this helps........Wierdo.........

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