Jetting

[Nuke427]

I also forgot about your elevation. You will need around two jet sizes lower to have the same mixture as someone at sea level. What octane fuel you run actually will have a little to do with it also. But mainly if you're going from premium to 110+ octane. Smaller jets the higher the octane. What jets and powervalve you use is based mostly on vacuum. i.e on my stage 3 650 double pumper I ran 72 primary and 75 secondary. I've done nothing but switch to a custom 750 double pumper and now I'm using 78 and 84. All because the differential pressure across the carb is lower. I need bigger jets so this carb will suck in the same amount of fuel my 650 did for any given air flow.