Water screw settings for factory pipe

[Ryan.huemmer]

b pipe screw settings?

running a 750 x2 with factory pipe blaster limited chamber what’s a good screw setting on exhaust haven’t run it yet just switched over from a westcoast

10/16 hooker
Factory blaster limited
750small pin
Sbn44
Westcoast exhaust mani
VForce 3 reeds
185 psi head

 

[fastgtfairlane]

Start with 1/2 turn out on top screw and 1/4 turn out on middle screw. Add more water on top screw for more bottom end response. I'm running almost identical setup as yours other than 46 and a 9/15 and I'm at 1 1/4 turn on top screw and 1/4 turn on middle screw. I'm running a dedicated line to the bottom of the headpipe instead of through the engine first so I can better control headpipe temps. I'm running a fully ported #20 sp cylinder as well.

 

[Ryan.huemmer]

Start with 1/2 turn out on top screw and 1/4 turn out on middle screw. Add more water on top screw for more bottom end response. I'm running almost identical setup as yours other than 46 and a 9/15 and I'm at 1 1/4 turn on top screw and 1/4 turn on middle screw. I'm running a dedicated line to the bottom of the headpipe instead of through the engine first so I can better control headpipe temps. I'm running a fully ported #20 sp cylinder as well.

same here on cooling lines and porteeed 22 cyl. what u running for top speed with the 9/15 havent tried my hooker yet

 

[fastgtfairlane]

It's not much on top speed as the 9/15 isnt enough impeller for the 750. Maybe 46ish mph. Worked excellent with the 650. The 10/16 would be ideal honestly

 

[dcwilson]

Start with 1/2 turn out on top screw and 1/4 turn out on middle screw. Add more water on top screw for more bottom end response. I'm running almost identical setup as yours other than 46 and a 9/15 and I'm at 1 1/4 turn on top screw and 1/4 turn on middle screw. I'm running a dedicated line to the bottom of the headpipe instead of through the engine first so I can better control headpipe temps. I'm running a fully ported #20 sp cylinder as well.

I wish I had known these settings when I was trying to tune my 750BP, dual SXR carb and 650FP. Starting from FP's recommended settings, working my way to what you have said here took forever. This is good info for anyone building a 750x2 with a FP.