I tried the no air filter suggestion, and it worked….ran great! Problem is, that’s not a solution I am comfy with. Put it back together and still same problem. I took the carb off and cleaned it… Main jets were gross with a greenish film…. I read all these comments and was having the same exact problem… Started and idled fine, but missed and bogged down under full throttle. The overall length should be approximately 3mm more than before. Now connect the choke’s electrical leads to a 12v power source.Measure the overall length of the choke from end-to-end, including the very tip of the needle.Remove choke assembly from the choke holder on the side of the carburetor.What we usually see with a bad auto-choke is that the engine will start up and run great cold, but as the engine warms up there will be problems driving, starting, and/or idling. This happens within a couple of minutes as the engine warms up. When the engine is turned on and voltage is applied to the choke, the needle extends and eventually plugs the enrichment ports within the carburetor. When your engine is off, the choke (enrichment circuit) is actually “on” in it’s default resting state. This circuit is controlled by the charging system. If this resister goes bad, the choke will likely become damaged shortly thereafter. The function of the choke resistor is to make sure that your choke doesn’t get hit with a deadly dose of over-voltage at high engine RPMs.
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