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Cooling system

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My 1998 rm125 goes through radiator fluid in an hour. I can only find a very slow leak at the screw but where could all of it go. I think it's low cause I can't see it in the radiator. The only thing is that my tranny oil comes out grey after not even riding that much. But when I took off the whole cover there was no noticeable leak in there. Where else could it leak from or to.

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Head or base gasket, the oil should be grey, if it got white & milky id say the coolant was going into the oil, there's a good chance you have a bad head or base gasket, that or that little screw leaks a lot :p

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Yeah. Probably head cause I did a top end on it and it had o rings so I bet that could be the problem. Where would the fluid go if it was a head gasket

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In that case its o-rings, if those weren't changed or if they were installed Incorrectly then that could be it, or how did you torque the headbolts down? If it wasn't criss-cross you could've warped the head, and when there's a leak on that mating surface it goes into the combustion chamber, does your exhaust smell like coolant?

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I did the cris cross pattern so the head isn't warped but I don't know what coolant smells like when it is burnt. Cause I've been running it 25:1 cause of break in so it's probably the O ring. I know I don't think I installed then good so it would make sense there.

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