BuggyDepot.com Tech Center 2.0   Categories: All Articles [31] Maintenance & Troubleshooting [3] BDX Install Guides [9] GY6 Performance Advice [3] Service Manuals [0] How It Works! Writeups [5] General GY6 Information [5] Weaknesses & Fixes [1] Modification Ideas [0] BuggyDepot News   We're Moving! Shipping Times Not Affected, But Phone Is Down Tuesday, June 1, 2010 BuggyDepot.com December 2009 Newsletter Wednesday, December 9, 2009 All Crossfire 150R Parts In Stock! Friday, October 9, 2009 Yerfer .net Content Available On BD! Tuesday, March 24, 2009 Slow Loading Times Today 3/23/09 Monday, March 23, 2009 Please note...   Content is copyright © 2005 - 2010 Buggydepot.com HOW IT WORKS! 150CC GY6 AUTOMATIC CHOKE [1,632 views]   Explaining the workings of the GY6 auto-choke. How It Works! 150cc GY6 Automatic Choke [1,632 views - 5 comments - Rating 5/5 ] 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. If you need an auto-choke or other related parts, we have them available here: Auto/Electric Choke Auto/Electric Choke Control Resistor Electric Choke O-Ring Seal This article has been downloaded 1,632 times 5 comments about this article: Poster #1 [04/21/10] Rating: No rating. Cant keep my Yerfdog running? Will start no problem. Can someone help me? Poster #2 [05/20/10] Rating: No rating. poster one iam having the same prob right now so iam hoping someone will answer you Poster #3 [06/07/10] Rating: No rating. I had the same problem untill I removed the carburetor and cleaned it thoroughly. No problems now. Poster #4 [06/20/10] Rating: No rating. I am having the opposite problem. Wo't start without choking off manualy or using starter fluid. Once it did start and was warm started and ran good for a while. Cleaned carb,jets everything three times. Replaced electric starter/choke still no good. Ordered new CDI am thinking I should have ordered resistor though now. Will see what happens. Any other suggestions? Poster #5 [07/06/10] Rating: No rating. I replaced the carb with a new one, carb is flooding out when engine is not running, do you have a display or diagram showing where all the lines hookup or is there something else i need to check Write a comment: Was this article helpful? 5/5 - Extremely Helpful! 4/5 - It's good! 3/5 - Needs more detail... 2/5 - Should be revised... 1/5 - Re-do this one... Are you a human? Type "yes": You can rate this article without commenting... Just select your rating and leave the comments form blank!