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#9478
lewis onions
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I had similar carb problems with mine. Try 480 main jet (this is the factory fitting, honest !). I also recommend a proper throttle slide – Teflon coated and with a hole at the top to prevent the creation of a vacuum and the associated sticking. I was told to use a chrome-plated brass slide but I am not sure that they are available. Try Hitchcocks, although carb wizard Don Payne no longer works there:

https://www.hitchcocksmotorcycles.com/home

Lewis