Maintenance & Technical > KX250 / KX125

Blown headgasket

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Marco810:
was out riding yesterday and my bike went up in a cloud of smoke :-o it was the rad overflow pouring coolant onto the pipe. at first i thought it was the cap but after letting it cool down and starting it with the cap off i could see air bubbles coming out of the hose at the top of the rad. anyways pulled it apart and it defiantly looks like it was burning water. any thoughts on keeping this from happening again?

oh and forgot to add when i was taking the head off the bolts ranges anywhere from 25ft pounds to 35 so hopefully thats the problem
 
some pics cause if your anything like me pictures are very important

stevea100m:
I would say that anytime you put a piston in it i would change the head gasket. Ive only ever had major head gasket issues with the 03 kx125 because it uses orings instead of a gasket.

Marco810:
Yeah i ordered a head gasket from ebay. im thinking maybe the guy that did the topend last didnt replace the gasket along with not torquing the head to specs. finding all kind of surprises as im tearing into it

DoldGuy:
The 92 Models were pretty good for the Chassis not pulling on the head like the first perimeter frames of 90 & 91, but it still does. Looks like you need to pull the cylinder & hone, & I would recommend to pull the cylinder studs & lap the surface so its flat & then do the cylinder head. Once both surfaces are completly flat you should be able to set them together with a thin film of oil & have a vacumm/suction between the two when you lift the head from the cylinder. The next thing is to loosen the bottomend motor mounts & swingarm pivot & lift  the motor up & while doing so, tighten the mounts.
Hope this info helps!
DoldGuy

Marco810:
some good info doldguy, thanks. think i even have a cylinder hone laying around
not sure what you mean by "lap the surface" though. also how does one pull the head studs?

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