coolant bubbling

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cooldude3552000

Member

Sep 11, 2005

88

0

• May 27, 2006

• #1

on my 92 yamah wr200(2 stroke) the coolant will be bubbling after a ride. It will do this all the time when I turn the bike off. It never did this before, it started after I rebuilt the engine. The radiator is full, and so is the reserve. The impeller is fine to and it does pump coolant. There is no coolant coming out but when you turn it off you can hera bubling for about a minute, I can't tell whether it is coming from the reserve or radiator.

 

Pete Payne

MX-Tech Suspension Agent

Nov 3, 2000

933

38

• May 27, 2006

• #2

you probably have a blown head gasket .

 

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cooldude3552000

Member

Sep 11, 2005

88

0

• May 27, 2006

• Thread starter
• #3

the head gasket is brand new, put in when the engine was rebuilt. How would this make the coolent bubble? It is just bubling, not coming out of the bike

 

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TimberPig

Member

Jan 19, 2006

859

1

• May 27, 2006

• #4

A second for your head gasket. What happens is that combustion pressure leaks past the gasket, putting bubbles in the coolant, from the combustion gases leaking into the cooling system.

Just because the head gasket is new, doesn't mean it was installed correctly, that it is sealing correctly, or that the cylinder and head surfaces are still true.

 

Pete Payne

MX-Tech Suspension Agent

Nov 3, 2000

933

38

• May 28, 2006

• #5

Timberpig,
Ditto !!!

 

X

xcracer72

Uhhh...

May 28, 2006

161

0

• May 28, 2006

• #6

ditto ditto. just had that happen to me. it takes a while for it to go completely kaput
what happens is your cylinder is pressurising your coolant system
easy fix