I hate these threads, which means I hate myself. Jetting start point?

[bored&stroked]

Doing some swapparu's with parts over the winter and just curious where I should start.
-Putting a 760 cylinder [thats going to get a light home porting] on my raider, so it'll basically be a 760 motor but with dual 38's. Go up, down, leave the stock 67.5/120 jetting the raider comes with? Ski is stock otherwise.
-Putting 760 cases and carbs [dual 44's] on my superjet. Thats a 61x punched to 84mm, freestyle porting, 190psi, protec pipe. It'll have pods vs the oem carb cover. I'm thinking reverse jetting this setup, never done that before.

 

[Big Kahuna]

On the raider, I would go up one or two on the High Speeds. And just try it. Just dont do a long WOT run until you get it tuned.

 

[kevbo]

I would install jets two sizes over stock and tune from there. I do not expect the 44s to need pilots or mains over 130,. I tuned a stock 701 62t cyl with 760 carbs that used 140 mains and still required the top screw open a little.. Start with the top screws open 2 turns and see if it runs better as you close them. If not then install a larger main. The idea is to find max power before the top screw is completely closed. Adjust the main jet size accordingly.

 

[fastgtfairlane]

http://x-h2o.com/index.php?threads/carburetor-specs-database-superjet-and-blaster-1.19403/

This thread has been quite useful for me trying to figure out where to start with jetting. Thanks again to those who took time to share their setup

http://www.x-h2o.com/index.php?threads/carb-tuning-101-info-from-watcon.58480/

This thread gives excellent instruction on getting the carbs dialed with the settings you start with.

I was running 75 pilots, 135 mains 1.5 n/s with 115g spring on 38s on a 62t cylinder with a tnt chamber bpipe. Stock flame arrestor with 1 screen per carb

Currently running 117.5 pilots, 120 mains, 2.0 n/s 95g spring with same engine and pipe with dual oem 44s. Stock flame arrestor with 1 screen per side

Might be somewhere to start

 

[waxhead]

760 carbs on the super-jet is easy
125 lows
115 highs
2.3 n/s
95 gram spring