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What a coincidence. I was stripping the bike out for a valve service earlier this evening and noticed one of the fin bungs sitting on top of the fin next to the spark plug on the vertical head. It seems to have just slid out??
It was rather hard, not resilient at all, as thought it would be.
I tapped it back under the fin with a screwdriver.
I don't think they are of huge importance although obviously there for a reason.
They must damp some resonance.. probably not when they are hard like mine though?
I think most of them have dropped out anyway!
I don't think they will adversely effect cooling, The engines over cool as it is.
I see no reason why you couldn't knock them out for cleaning and then knock them back in again, or not.
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