Jetting for new pipe

[greenmachine70]

Where should I start for jetting a stock bike with a fmf fatty pipe. All stock other than that???
Thanks

[headache]

start with a 270 main. shouldn't need any bigger than that..

[dave5.0]

I jetted a buddies bike with the same setup, I think we ended up with a 300 main. Weather, altitude, all will make a difference. If you want it the safest, jump up main jet sizes till it starts to bog and sputter. Then come down one size at a time till it pulls smooth and runs good. Then run it through the gears full throttle and shut it off. Check your plug color. Dark brown to black and still running good will keep you safe. As long as it runs good.