Bpipe configuration

[bondra131]

On my 2014 superjet I am putting a head with 35cc domes, bpipe, and MSD enhancer. No other modes stock carbs, anyone know what the correct main and pilot jets are and also correct needle and seat size and weight of spring? Pretty basic set up I'm sure tons are running this correct carb configuration

 

[bondra131]

Oh.. Huh. The factory site listed 140 and 70-80 can't remember which of the 3 but that was for the pipe on a stock ski, not with the head. Also listed ns and spring but those may have been the same as stock

 

[bondra131]

Actually, it says 140 main and 120 pilot... 120? Isn't that huge wtf

 

[BruceSki]

That's for a single 44 on a 61x motor.

135 main
75 pilot
95 gram spring(with open flame arrestors or two screens removed from oem flame arrestor)
1.5 needle and seat

 

[Lumpy]

Their instructions are for a single carb 61x I believe. I run 75/135 with enhancer and 33cc domes and b pipe. Dont remember pop off think it was around 28-30 but that could be wrong

 

[bondra131]

Oh wtf are they posting specs for a friggin single carb 61x for lmao. Ok cool thanks guys. I also got 35cc domes cuz I've always been told that's standard puts it at like 180psi but now someone just told me at 2,200 feet where I live, 35cc is too big.. Idk I guess I will just pressure test and go from
There

 

[BruceSki]

I've always ran 33cc domes for that little extra oomph. Some people say it requires race has or at least a partial race has blend with pump gas.

However I've been running mine like this a few years with pump 93 and lots of WOT.

 

[bondra131]

And you ride sea level? I'm at 2,200ft. With that being said, think I will exchange the 35's for 33's. I run 92 ethanol free

 

[BruceSki]

Yes sea level. But I think I have lower popoff and larger needle and seat. Like 2.0 instead of 1.5.

 

[DAG]

dome size and compression numbers don't effect your air fuel ratio. Domes only change how much volume that A/F ratio is squeezed into

 

[bondra131]

That's what I thought... Then I was told differently lol

dome size and compression numbers don't effect your air fuel ratio. Domes only change how much volume that A/F ratio is squeezed into

 

[Fro Diesel]

I've always ran 33cc domes for that little extra oomph. Some people say it requires race has or at least a partial race has blend with pump gas.

However I've been running mine like this a few years with pump 93 and lots of WOT.

Jetmaniac sells 34cc. Works great n safe on pump gas at sea level. In the past I have run 205psi on pump gas just fine