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Discussion Starter · #1 ·
I have a 1996 KX100. Every time I start it, it spits most all of the water out of the overflow on the radiator and will eventually overheat. I have replaced the radiator cap and still nothing.

I have heard it was a blown head-gasket. I took the bike apart and found out the gasket was still in good condition.

What else can i do to fix this?
 

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Did you replace the gasket? Also, there could be a few other things, head/cylinder may need trued. May have a warp in it. Also, is the coolant flowing? there may be a pump issue.
 

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Dirt Bike Dad
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Sounds like a water pump failure.
Open your radiator cap and look for water flowing through it while bike is running.
Drain the oil and look for milky water mixed in it. This is a sign of the water pump seal is gone and usually ends up being a failed pump eventually.
 

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check around cylinder to see if there are any cracks on the cylinder to the water jacket as i have had this hapen on a bike before
 
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