Re: 1971 Vespa Ciao Will Not Start

Seth B /
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Check if the plug is wet or dry after you try starting it. You also might try squirting a bit of premix in the plug hole, reinstall plug, and try it. These Vespas are so picky about air/fuel ratios. It’s probably just the wrong jet, so you’ll have to experiment and plug chop to get it right. There’s also a tuning spreadsheet in the wiki that shows what others have done, to help get you close. I have an identical setup on a Bravo, and I am jetted at 69. But mine is an anomaly. It shouldn’t be jetted that high, but it runs perfect and does well over 35 mph. Nobody else who is running a stock cylinder is jetted this high.

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