The yanmarhelp site is playing up again, so I'll try here:
My new engine has now clocked up 5 hours running time. It runs well, starts instantly, and is generally thoroughly satisfactory.
However, I worry a bit about the vibration/resonance. Occasionally, at no particular speed, it does a kind vibration which I can feel through the cockpit seat. It doesn't seem to actually move very much, but nonetheless the resonance can be felt.
Altering the throttle position makes no difference once it has started .
It is definitely in the engine (or gearbox) because it does it even in neutral with the prop shaft stationary.
I know the engine is not renowned for balance and smooth running, being a rather basic one-cylinder design, but how much vibration and resonance is normal?
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Yanmar 1GM10 - how much vibration is normal?
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