Re: 1971 Vespa Ciao Will Not Start

Seth B /
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You should have got it running first, before you changed carbs. Your air/fuel ratio isn’t even close. If you have stock exhaust, you are drowning the motor. It can’t handle that much fuel. The stock 12.10 carburetor only had a 46 jet, and it’s a smaller carb and restricted air box. You put a larger throat carburetor with a bigger jet, then put high flow air filter on. Everything is off, so it can’t run. At minimum, you need to down-jet, a lot.

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