carb rejetting

wayne

wayne

wannaroll
Location
Mesquite, Texas
I am going from a dual 38 setup to a single 44. i am adding a pipe, r&d adds about 18 hp. the rest of the engine is stock. might try to get my flywheel lightened.

i need to know what my jetting for high and low and pop off and what gram spring should be used.

i need to get this set up for the loanstar freeride.

thanks,
wayne
 
wayne

wayne

wannaroll
Location
Mesquite, Texas
i don't want to have to deal with tuning a dual setup. i don't make highspeed runs just want bottom end for jumping and tricks. i am not real good at tuning the carbs and duals would be a pain IMO. if i had some one to rejet and tune for a good price i would consider staying with the duals. i just don't want to burn up my engine.
 
Mark44

Mark44

Katie's Boss
Location
100% one place
FYI You tune duel just like a single carb they all work the same you just have two more screws to turn is the only difference. If you can tune a single you can tune duel.

The first step in learning this is to study the Mikuni manual it really helps, if you send me your email address I can send you a copy.

Just trying to help out don't mean anything derogatory.


Mark44
 
wayne

wayne

wannaroll
Location
Mesquite, Texas
any help is greatly appreciated.

wayne-vaughn@tx.rr.com

here is my email address.

me and my best friend are currrently reinforcing and refoaming our ski's and installing foot holds. i ordered an adapter plate for a single intake, but if the duals are better i can resell the adapter and mani.

matt e sent me the specs for rejetting my 38's

Probably 75-80/135-140 and 95g or 80g springs

any carb tuners please chime in and let me know if this sounds good.

will probably need some help at the LSF to get it tuned properly. i guess my next step is to order t handles for the 38's if that is the best way to go.
 
thegoldenboy

thegoldenboy

RN Surgery... soon
Location
Toronto
Run the dual 38's, they are the best carbs to run on a 62T platform that is stock to mildly built.

I think you'd regret going to the single 44.


After its tuned leave it. I don't see why people are so timid on getting a ski dialed in. Do it once, mark your findings and unless you are changing mods or serious temps/altitude than forget touching it.
 
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
If you do go with a single 44, you'll probably be somewhere in the 130P/150M range.

I would stick with dual 38's. They are easy to tune and very forgiving.
Besides, once you tune them, you leave them alone. So this tuning aspect is done ONCE.
 
wayne

wayne

wannaroll
Location
Mesquite, Texas
yes it is aaron. i am going to stick with the 38's.

you did not need to redo the carbs with the pipe you had on it?

i figured it would not run properly if a pipe was added.
 
hangtime

hangtime

Speak up ,don't kiss azz
Location
WORCESTER,MASS- HAMPTON N.H.
Stick with the 38's .they are very crisp and run well through all the RPM range .What Matt E gave you should be somewhere within that range .Stock springs are 95g

You should check the carb spec thread .Lots of setups there
 
Last edited:
Matt_E

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
wayne said:
yes it is aaron. i am going to stick with the 38's.

you did not need to redo the carbs with the pipe you had on it?

i figured it would not run properly if a pipe was added.
Click to expand...

Stock 38 jetting is 70/130.

Doesn't matter what pipe you stick on there, it will be 72.5-80 pilot, and 132.5-140 main.
Leave the N&S at 1.5, put 95g springs in it.
 
ATS_Aaron

ATS_Aaron

X-
Location
Shady Shores, TX
An R&D dry pipe?

That is basically what that 701 had on it when I had it. I bought my pipe off Ebay from Jeff Jacobs. He said it was the prototype that all dry pipes were later built from. It looked like a Speedwerks/R&D/Factory Type 4 etc, they all kind of look alike to me.

Aaron
 
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