Pull the choke and run 12v to it if the needle extends than the choke is fine. It really is not a choke, but an enrichment valve. Your carb has an extra fixed jet for cold starting. As the engine warms and the 12v is supplied tthe enrichment valve the needle extracts closing off the enrichment jet. I have never seen a defective enrichment valve stuck in the extended position. When the valve goes bad due to either the valve being bad or lack of power to it, the engine wil start just fine for the needle is retracted in its normal rest position, but as the engine warms up if the valve is defective the needle does not expand closing off the enrichment jet thus the engine will begin to run on the rich side and badly. I would first pull the carb and thourally clean making sure all jets and passages are open.When they sit for some time the carbs plug up . TOM
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