Help with what size jets

[Lc2000000]

Hello so I got a new build coming on my 91 super jet
It’s just a 701 with a protec pipe, Ada girdled head and 91 octane 185 lb domes and with the stock 44mm carb and was wondering about what size jets and spring I’m gonna need
Thanks for any input

 

[fastgtfairlane]

115-120 pilots, 140-150 mains, 2.0 n/s 95g spring with 25 or so psi popoff should be very close. Factors such as location above sea level, flame arrestor choice, and impeller/pump load will come into play as to the final tune and that's something you'll want to spend time with to get it dialed.

 

[Lc2000000]

115-120 pilots, 140-150 mains, 2.0 n/s 95g spring with 25 or so psi popoff should be very close. Factors such as location above sea level, flame arrestor choice, and impeller/pump load will come into play as to the final tune and that's something you'll want to spend time with to get it dialed.

Okay thanks man

 

[Boneless Bill]

I have a stock SN650 and going to install a Coffman sizzler pipe. Purchased Flame Arrestor by ProK Universal 70mm - 2.75" Flange. 9/15 Yamaha hooker impeller. I live in Lake Havasu under 800' elevation and the Coffman jetting instructions mention 125 Main Jet size, (I assume this is the high-speed main jet) but nothing on Low-Speed Pilot Jet size, jetting at sea level. Does anyone have any input on this? Appreciate any info.

 

[kevbo]

We use to get by with a 65gram spring and opening the top screw 2 turns out. Now I would add a larger main and pilot jet and leave the stock spring in it.