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Answer YZ50 CHOKE

CARBY MIXTURE SCREW SET TOO LEAN

Cracked intake boot, dirty carb [inside].

Cracked boot is most commonly found in these older bikes. An air leak between the carb and the combustion chamber of any kind will produce what you describe as it is being starved for fuel and flood with air. A simple way to confirm or disprove this is to spray a solution on the boot to see the effect of the solution entering the combustion chamber with the leaking air. A safe solution would be water but I always use starting fluid and small controlled burst and listen for the engine to rev.

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Q: What would cause a 1980 YZ50 to run better on choke?
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