Jetting and adjusting carbs after mods.. help

W

wickedwhitwix

Location
Minnesota
im sick of searching here is my mod list
Factory B pipe limited chamber
MSD enhancer
MSD coil
ADA head 35mm domes
V force 3 reeds
Prox flame arresters
Solas impeller dont remember pitch
would like to know what you guys think for carb setting and jetting
thank you
 
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GIL

GIL

Power In The Hands Of Few
Location
Cullman AL
This is under the assumption you do have stk 38s on you ski---

135 main jets
70 pilots
stk springs and stk n/s
low screws at 1.25 turns out
high speed screws at 3/4 turns out

the ski is normally always ridden at 500' above sea level in fresh water.
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
I find that the stock springs (115g) result in popoff that is too high for the piped motor. I just went through this on a similar setup. The boat would stumble and die below 1/4 throttle.
I'd go with 95g springs.
 
aboarder

aboarder

Location
Goodwood, ON
Does anyone know how many turns of the adjustment screw is equal to going up one jet size? ie 130 main to 135. I'm running 70 and 130 and my screws are out 2 1/4 and almost 2 1/2 and i'd like to be able to bring them in. I want to know if I need a 135 or 140 main.

Sorry about the thread jack. It's a similar topic and I run similar mods plus porting and taper bored carbs.
 
aboarder

aboarder

Location
Goodwood, ON
I was going to try 75 pilot and am trying to decide if i need to buy a 135 or 140 main. I'm good at tuning. I do all my own engine work. The only reason i'm asking this question is cause none of the shops around here have jets for mikuni BN's. I need to order them. I may just have to order a few sizes and try them out.
 
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