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Message: [QUOTE="sparkysakitas, post: 1243712, member: 63311"] check see if you are losing coolant?? then pull just the head off look at the o- ring gaskets if they are squished that is probably the cause of the leak i had that problem when doing the top end on my 1990 rm 125 i would also take the cylinder off with engine out of bike tip it up side down see if any coolant comes out, blow it out with some compressed air, check base gasket, empty out expansion chamber and let it dry out [/QUOTE]