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Post by rtsecino on Oct 12, 2015 10:59:24 GMT -5
Here is my dilemma. I have a TaoTao CY50B scoot, and have recently been having issues wherein after a relatively longer ride (>5miles), the engine kind of stammers and then conks out when I slow down or come to a stop sign. Everything was stock. This is what I've done since. Replaced the fuel line with the yellow tygon tubing, new fuel filter, and new irridium plug. That didn't really help, so I adjusted the valves. Seemed to be running really well, but then had same issue after a long ride. I just replaced the stock carburetor with a Keihin carb. Here is my main question. I am assuming that since the engine is a 1p39qmb (?secret 60cc), would the stock carb have a larger main jet to accommodate the larger cc's? I tried opening up the stock carb to examine the jets but the 3 bolts had their heads sheared flush at the factory (Bastards!!). If I was to order a new main jet for the Keihin carb, what size would work best for the 1p39qmb motor?
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Post by lain on Oct 12, 2015 21:12:45 GMT -5
Are you sure you adjusted the valves correctly? Did you do it after letting it sit overnight or after a ride? Sounds like valve issue or maybe bad cdi or coil.
If the jet was wrong you would notice it right away when you try to take off it would just die instead. You could benefit from finding the perfect size but the wrong one should not be an issue 5 miles in.
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New Rider
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Posts: 16
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Joined: Mar 7, 2013 9:02:16 GMT -5
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Post by rtsecino on Oct 13, 2015 17:50:04 GMT -5
I adjusted the valves when the engine was cold. I did take the scoot for a spin after replacing the stock carb. with the Keihin. So far so good. I am keeping my fingers crossed. The jets seem to be fine for the 1pqmb motor.
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