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One of the Carolinas chapter members describes what he did:
I purchased on EBay a cowl with the "fat fifty" shape. I remember the price was $50 but the shipping was very high (weigh and size). The real trick is a V4 shape can completely cover a modern straight inline 3 cylinder engine.
The "conversion" was that I put it over the new engine (3 cylinder Yamaha) and it almost fit. A sawzall trimmed some metal away and darn it fit. The new engine still has its original cowl. The old cowl has enough weight so it will not bounce off. The old cowl had form sound deadening inside so there is no metal to metal contact. There was maybe 30% of open space on the sides between the two so air can get into the modern engine but you can not see the space unless you are looking up from ground level. I also painted part of outside cowl the same color as on the new motor’s bottom.