Re: Motobecane av88 - only runs at high rpm

Kenneth Hill /
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It could be an air-leak "issue" with either where it bolts to the manifold, or maybe the top cap gasket was compromised during your cleaning/reassembly. Make sure you have an o-ring to seal where the carb meets the manifold (since you said it started happening) after the carb "fell off" to seal that junction. You have to physically push the carb against the o-ring and manifold to get a good seal.

Another possibility is that there was an air leak in the first place and the previous owner compensated by up-jetting, now that you have it sealed properly, you're having a too-rich condition?

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