We frequently receive questions about how the auto-choke and its operating needle work. As it turns out, the auto-choke isn't a choke at all. That is, it doesn't choke airflow through the carburetor like you would find on a lawnmower or generator type of engine. Instead, it sends extra fuel through the carburetor. This is called an enrichment circuit.
This circuit is controlled by the charging system. When your engine is off, the choke (enrichment circuit) is actually "on" in it's default resting state. 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. This happens within a couple of minutes as the engine warms up.
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.
To test your auto-choke:
1. Remove choke assembly from the choke holder on the side of the carb. The needle should be clearly visable.
2. Measure the overall length of the choke from end-to-end, including the very tip of the needle.
3. Now connect the choke's electrical leads to a 12v power source. Black is negative.
4. Wait 5-10 minutes and re-measure. The needle should have extended.
5. The overall length should be approximately 3mm more than before.
credit to buggydepot.com
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