67 sears allstate almost running

timothy /
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Hey out there. I have a '67 sears allstate compact scooter (puch) that I have owned for 20 years. Just fired it up last week and put plates on it, and all is good, but for one problem. I start it and it runs great. About 2 minutes into the ride I start losing power and have to decrease throttle. Then sometimes the power comes back, and sometimes it bogs down more. I do not know a whole lot about Bing carbs, but it sounds like a mixture problem. Black plug, lots of smoke when the power loss occurs. Bing carbs of this ilk only appear to have an idle screw on the side. Any help or suggestions would be appreciated. Thanks a lot!!! T

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