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Can I get peoples best guess on what to start with? It is going on a 95" with stock heads, 9.3 compression, khrome works slip-ons, SE air intake with K&N filter. SE 203 cams.
What needle, pilot, main, and accel pump jet?
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98 needle, clip in the middle
20 pilot
165 main
50 pump nozzle
That's what I ran in my '03 Dyna with pretty much the same setup you have. This is a popular combination. You may get away with a 17.5 pilot or may need a 22.5, you'll be able to tell once you get it together and set the idle mixture screw. The stock 25 pilot is usually rich.
The Mikuni tuning manual is good.
Another HSR 42 tuning question
