Not Keihin mains.... But have had good luck with Jets R Us repros. Others have also used Sirius Inc.
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I have a sort of similar set up engine-wise but with straight to ear puncture Carpy 4-1 mild steel pipe, cb650 cam and 600cc CruznInImage/ebay big bore kit, stock intake (ported), pro 3 angle valve job (OEM valves), stock filter box.
Pd46a carbs
Using 105 MIKUNIs which was just dumb luck to find they are better (long previous post I did here on that last year at some point). 42 pilots, 1.75 turns out seems best, needle shimmed higher/richer than OEM. 40-42mpg. Maybe it makes 10% more than a stock bike all in = no idea, didn't dyne before and after... but it FEELS REALLY QUICK...haha.
