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coolant foam question

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I am looking into buying a 1997 yz125, it needs a top end soon but I noticed the coolant froths a bit under throttle and goes away like carbonation when idling... no discoloration it's a still clear red, and no obvious bubbles in the pumped water when revved... Is that quarter inch layer of bubbles an issue? Or will a new piston kit and gaskets cure it anyhow?

Edited by CTV_Paton

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yea when its revved the fluid flows clear, when you let off the throttle and the rpm's drop the fluid settles at the full level with a layer of foamy bubbles on top, and within some seconds the bubbles vanish. like shaking a bottle of pop only you see no bubbles until you stop shaking and there's none being purged with the cap still on.

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could be a leaky head gasket, or as serious as a cracked jug (rare).

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