Jetting advice/1998 Superjet

P

PNW-JET

Location
Portland, Oregon
Hey guys!
(sorry if I am posting in the wrong area or incorrectly)
Fairly new to this forum and had a question as I am in the middle of installing a factory b pipe (limited) on my 98’ Superjet.
It’s bone stock except for a msd enhancer and a 12 vane pump/SS impeller.
I’ve figured out the install on the pipe, but now I’m rebuilding the carbs and want to get it right. I’ve got quite a few buddies that ride and wrench, but advice from them has been far and few.
(I think they had to learn the hard way or were too stubborn to ask others for advice so now they gate keep their tips/tricks/methods)
Here’s what I was thinking as far as a baseline or start as far as jetting.
Main:135
Pilot:70
n/s:1.8
Spring:95
Any advice?

Thanks in advance!
 
Roseand

Roseand

The Weaponizer
Site Supporter
Location
Wisconsin
PNW-JET said:
Awesome, thank you!
Just curious though. I’ve always heard the typical “135 main and 70 pilot”
can I ask why you prefer/recommend this configuration instead?
Also, what do you recommend for n/s?
I’m at sea level, btw.
Click to expand...
Your ski is all stock. Just put in the recommended jets factory pipe says on their site and go from there. It is a very good starting point.
 
kevbo

kevbo

Location
dfw
The stock exhaust has no tuning so the main jets will be smaller than an aftermarket pipe would require. Tune the top carb screws just rich of peak rpm. Tune the pilot jets to make it four cycle a little around 1/4 throttle. Lowering the pop off will also make 1/4 throttle richer. If it lags much more than a second going from idle to full power look at the impeller pitch. Too much load kills low speed performance.
 
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