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How do you test a float?

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I just rebuild my XR600R. I'm having trouble with the carbarator overflowing. Before I start the bike, no problem. It only overflows after it runs for 10-15 minutes. Than won't stop flowing out the overflow drain even after the bike is off.

I've had it apart twice to check the needle and seat. The fuel flow shuts off completely with light pressure. The dry level is correct @.53".

Can the float on a 94 XR600R saturate? How can I test it? The float and needle are pricy. What's next.

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does your main jet use a plastic baffle?  seen those hang the float even when installed correctly.

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does your main jet use a plastic baffle?  seen those hang the float even when installed correctly.

 

The white little cup around the main jet? It broke few years back and has never been replaced.

 

Sounds like your gas tank isn’t venting and is pressurizing.

 

I'll check for sure. Maybe the cap vent has failed. The vent hose is new.

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