Super Jet Richer high speed screw on rear carb of dual 38s?

[km60155]

Anyone know why the high screw setting is richer on the rear carb for stock Superjets and Blasters running dual 38s? What's the rationale for this difference? I've noticed that on both the Factory B pipe installation instructions and on the TCFreeride dual 38 tuning video, they don't suggest any difference in the front and rear high speed screw settings. Should the rear carb high speed screw always be set richer than the front carb?

 

[Big Kahuna]

Rear Cylinder Piston Seizures – Group K

groupk.com

 

[kevbo]

Fuel mixture requirements will almost always vary between cylinders. Kawasakis hot cylinder is usually the front. Its a little time consuming but always start rich of peak power and lean each carb until either rpm stops increasing or throttle response suffers.

 

[Mike W]

Just went through this on my ‘17 RN. My rear plug was way lean after I installed a B pipe. Did a leak down test. Good. Wanted to rule out an any leaks or bad gasket so I replaced the head, exhaust and intake gaskets and installed a new coil. Same thing. Richened up the rear carb about 1/4 turn. Plugs look to be the same color now.