Super Jet who tunned this kind of protec pipe

[King of the Js550]

 

[BruceSki]

what are you asking?

 

[tor*p*do]

I have one on my 650 backup motor, runs great!

 

[King of the Js550]

i need to know the jeting specs do i need differnt jets

 

[BruceSki]

yes you do. I ran dual carbs on my 61x 701 when i used that pipe. I used my dual 38's off my superjet. I ran the same jetting i used for a factory pipe.

I would think you need something like a 145 main and 120 low I think that is what factory pipe suggests for a single 44. I would check their installation guide for the exact numbers though. That will get you close then you can tune more from there.

 

[King of the Js550]

would it be the same on 650 motor

 

[ryan]

would it be the same on 650 motor

not at all

 

[King of the Js550]

see thats my problem im running it on a 650

 

[BruceSki]

sorry. can't help with that. the 701's are close. They differ only in the intake manifold and fuel delivery.

 

[tor*p*do]

on my 650 with hi compression head, MSD, etc
I am running 120 Lo, 115 Hi jets
1.5 n&s, silver spring
hi speed screw 1 turn
lo spd screw 1.25 turn
FYI

 

[King of the Js550]

do you know the stock 650 specs

 

[jetfreak78]

1991 650 SN Superjet-stock

Mikuni SBN 44mm

115 high jet
120 low jet
1.5 needle valve
115 gramm spring
1 1/2 high screw
2 1/8 low screw