2001 klx300 running hot

The 300 has started dumpimg coolant (1qrt) out of the tank after short rides. new concern after owning for 3 yrs. I have installed the kx500 cap 1.6 lbs and have checked my pump impeller. Pressure test did not show any leaks. I have also noticed it will not draw from the tank after cooling down.

Maybe that cap doesn't have the outer seal that seals the cap to the top of the radiator neck or maybe it's damaged. Try blowing into the overflow tube. You should feel back pressure or it should flow into the cooling system. You should not hear flow around the cap to the outside.

The KLX has a thermostat need to check that out . It may have locked up closed .

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