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cr250 2001 fowling plugs please help

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Too rich, either from incorrect jetting or improper float height. Weak spark, low compression etc.....

 

Some more info would be extremely helpful. Any recent engine or carb work? Did this problem just start? What jetting and needle is currently in the carb? Temperatures and altitude where you live? Help us to help you.....

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ok so about two months ago this started out of the blue, 3 days ago i did a top end, bike runs mint, spark is fine, my mate says float height is fine and the jets have allways been the same, and im running at 40 to 1

 

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Whats your elevation and how hot is it outside? what jets are you running and whats done to your motor

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standard motor boyesen reeds its been at the same elevation all its life since ive had it never had a problem till roughly 3 months ago allways had same jetting

 

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Is it smoking terribly? Not sure the last time you checked/changed the crank seals. If it's smoking when warmed up, it could be sucking transmission oil in on the right clutch side crank seal which will foul plugs in a hurry.

Have you checked the coolant level to make sure it hasn't dropped due to a leak into the cylinder from the head gasket?

Definitely check that choke circuit out first.

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