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Montesa Cota 200 Jetting?

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I am rebuilding a 84 Cota 200 and am having some carburation woes. Talking to a friend he pointed out that I am using a modern synthetic oil at 50:1 which means the fuel is less viscous than the standard jetting was set for back in the 80's at 25:1. Has anyone esle experience of changing to modern oils at a higher ratio and what jetting changes did you need to make to compensate? many thanks, Gary,

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