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RS setup means that it uses RS pistons. There will be an aluminum shim or two under the cylinder to raise it up to match the higher dome height of the RS piston compared to the flat top Cr piston. The RS piston his much better for sealing and life.
You are right to assume that the head gasket was failing based on the water loss you describe. If you can’t find a leak and its not going into the over flow, the head gasket is leaking. You should replace both rings when your in there, its cheap insurance.
@Little Bill wrote:
My power plant is a cr 125 with an rs setup. By the way is that refered to as a crs?
No. The CRS is a different engine entirely; it is one of the several ICC engines available.
Frothing sounds like the head “O” ring to me but as an aside we had loss of coolant for a while on a CR125 and were mystified until I tracked it down to a faulty radiator cap, take the cap off and check that you see an indentation on both rubber seals indicating a good seal, the one we had was 0.020″ shorter than others and was not sealing correctly on the inside of the radiator, the symptoms were, full overflow bottle no frothing.
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