Re: 1977 Garelli NO1

Smitty Smith /
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it's possible that you may be hearing a spark knock? Even some mopeds will spark-knock on low octane or old fuel. Ignition and timing problems or in need of resetting could also cause this condition. Is the noise coming from your exhaust, do you have a stock exhaust, or an expansion-chamber type?

I'm trying to troubleshoot and diagnose the engine/moped, without putting my own ear to it.

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