Hi, I have an '80 Motobecane Moby 50 with a Variator clutch. I seem to have developed an engine vibration. The vibration is not noticeable when riding the bike. It is the most noticeable at about 1/4 throttle but is faintly there at all times while on the kickstand. You can visually see the engine vibrating. I checked the rubber mount bushings but they seem fine. The engine runs fine; accelerates, pulls good, idles fine. I am afraid there is something internally wrong but as of now I do not know what to think. Regards, A. Martin
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