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As a point of interest (for me anyway), my son's 1980 XR200 has a Keihin 30mm carb that is identical to the Mikuni in almost every way. There are some subtle manufacturing differences, but they're obviously spec'd for the same application.
Knowing that, I took the bowl off of the Keihin today, and found a 108 main jet inside. My recommendation to anyone that is installing a Mikuni on a Beast is to start at that level and work your way up, depending upon stock vs. performance exhaust and air filter.
I intend to install a 110 on T's Beast this weekend, so we'll see how it performs.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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