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I believe the statement, but I have never experienced it. I have pottered arround the pits quite a bit, stopping and starting for pedestrians and traffic. I have only 1/2' of foam for a seat and I have never felt any type of harshness. I also know two other Vincent owners that have belt drives on their street machines, one on a BSA and the other on a Parkin single. I will enquire, but in the past decade, they have never mentioned any harshness.Thank you David. A composite belt drive is not universally considered an adequate substitute for an independent cush. I was discouraged from fitting a BNR drive to a BSA road single by Phil Pearson who uses belts for racing - fine for racing, but harsh pottering at very low revs. on a roadster was the conventional wisdom in that particular application.
Glen,Forgot to address the primary cover question. First, I should mention that I will need to remove some material from the inside of the new Molnar cases in order to get the clutch drum with belt to clear. As far as the cover goes, I also could not get a clear answer from Bob as to whether it will fit or not, or whether it required ventilation or not. His response to the question was that " a belt will always run cooler than a chain in a given situation" or words to that effect. I would like to run the standard cover, without ventilation, because this is a road bike and I'm quite sure that an open racing type cover will allow road grit and grime to get in the primary.
I might compromise and use a standard cover but cut some smallish vents for and aft, will likely fit screens to those in order to keep out the big chunks.