YZ250 Problem - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-18-2002, 08:31 PM
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YZ250 Problem

I just bought a YZ250 (91) and it slowly blows water out of the overfill tube. The person that owned it before me said he re-built the top and bottom end. Could a gasket be blown or is the radiator cap worn? The bike runs good.
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post #2 of (permalink) Old 03-18-2002, 08:33 PM
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Re: YZ250 Problem

u sure it's just not overflow?? I heard two strokes do that when they get hot.
post #3 of (permalink) Old 03-18-2002, 11:23 PM
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Re: YZ250 Problem

Sounds like the cap could be bad. I have the same engine and it only throws the fluid out when it's really hot or when it's overfilled, and when it does it ain't a slow leak, it's a full force deal. And if a seal was shot, it'd just blow the coolant out the muffler and push steam out the overfill.
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post #4 of (permalink) Old 03-19-2002, 09:20 AM
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Re: YZ250 Problem

Another possibility is a head gasket leak from the cylinder side into the coolant system, which causes the system to pressurize and over flow. Watch the level of your coolant closely. If it continues, I would pull the head off, check the gasket for any signs of a tear or leak, and also check the head surface for warpage. Keep us posted.
post #5 of (permalink) Old 03-19-2002, 11:54 PM
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Re: YZ250 Problem

It'll be the rad cap , pick up another one and check it out.... I had the same problem , and found another 16 pound cap to fit at the auto parts store...
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