SX/SXi/SXi Pro Question about the Coffman pipe and jetting

[Huntersandy]

I’m gonna run a Coffman rocket pipe and the twin Mikuni 40i’s on the winter build, should I run the carbs as is with some screwdriver tuning? Or would it be better to have them jetted specifically for the pipe. If so, does anybody know the jetting and other carburetor settings required?

 

[kevbo]

The bottom screw adjusters are for the idle mixture only and the top adjusters are for full throttle only. If the tops end up over 2 turns out then use a larger main jet. Its important to make sure its able to get on the pipe quickly, this can be a challenge with high port cylinders. If power response lags over a second then you probably have too much pump load.

 

[john zigler]

You will need to jet your carbs, and lower pop off to match your application.

We sell jetting kits;

Jetting kit Mikuni SBN Carb

We have over 30 years experience building, and tuning skis. Over these years I have kept notes on what jetting we have used for specific set ups. We sell jettting kits, based on these notes. Each kit is for ONE carb. Kit includes genuine Mikuni parts. One Pilot Jet, One Main Jet, One Needle and...

watcon.com

If you do want to order from us, please give me all your specs in the notes/comments section of the shopping cart t checkout. I need to know what ski, what engine, any engine mods, what pipe, what impeller, and elevation where you ride.