Got a second hand 2002 Cr250. Pretty happy with the bike. I am a bit concerned about the foam in the radiator after I have ridden the bike. Is this normal? If not what is the cause of it and how serious is the problem?
That's typically a symptom of a blown head gasket. Being a 2-stroke, the crankcase is under pressure, so any gasket that seals both the crankcase and a water passage is suspect.
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