Carburetor (specs) Database: SuperJet and Blaster 1

[Sanford]

The SuperJet and B1 Carburetor Database

I'm in the process of putting a pair of 46mm Mikuni's on my SJ to see if I like them and have been thinking of how I plan to jet them. I then though how helpful it would be if we all had a large database list of what others run with their given setup. Since many of us run pretty similar motor setups, it would be useful for the next build or give others an idea of where to start.

To prevent repeat information, if you see exact jetting specs that you are running (same carbs/motor), then please don't add to the list again.

Lets try to keep this list consistent and most importantly, concise.

===========

Brand =
Model =
Size =
Quantity =
Main Jet =
Pilot Jet =
Needle/Seat =
Spring =
Pilot screw =
Main Screw =
- - - - - -
Gas Octane =
Altitude =
Main type of riding =
Would it pass the 10 second WOT test =
Powerband =
Motor type/setup =

============

(please copy & paste above and fill out in your own post)
​

Okay, I'll start off with my jetting specs for my RN SJ:

Brand = Mikuni
Model = OEM
Size = 38mm
Quantity = 2
Pilot Jet = 75
Main Jet = 135
Needle/Seat = 2.0
Spring = 95g
Pilot screw = 1-1/4
Main Screw = 1-1/2
- - - - - -
Gas Octane = 93
Altitude = Sea level
Main type of riding = Freeride
Would it pass the 10 second WOT test = YES!
Powerband = Bottom to midrange
Motor type/setup = 701 (61x cyl/62t case), mild cylinder porting, 190psi head, Vforce2 reeds, Factory "mod" B Pipe, MSD Enhancer, stock F/A.

Legal Disclaimer: The information provided here is only to be used as a guideline and should not be used as the definitive answer. Jetting should only be performed by experienced mechanics. Improper jetting will result in severe engine damage.

 

[Matt_E]

Brand = Mikuni
Model = Retail
Size = 44mm
Quantity = 2
Pilot Jet = 115
Main Jet = 122.5
Needle/Seat = 2.0
Spring = 95g
Pilot screw = 1-1/4
Main Screw = 1-1/2
- - - - - -
Gas Octane = 93
Altitude = Sea level - 700ft
Main type of riding = Freeride
Would it pass the 10 second WOT test = YES!
Powerband = Bottom, midrange, top
Motor type/setup = 717 (61x cyl/62t case), heavy homemade cylinder porting, case porting, 175psi head, Vforce2 reeds, Factory "mod" B Pipe, Total Loss, stock F/A.

 

[Matt_E]

Brand = Full Spectrum / Mikuni
Model = Full Spectrum
Size = 48mm
Quantity = 1
Pilot Jet = 132.5
Main Jet = 145
Needle/Seat = 2.0
Spring = 80g
Pilot screw = 1
Main Screw = 5/8
Return line restrictor = 60 Main
- - - - - -
Gas Octane = 93
Altitude = Sea level - 700ft
Main type of riding = Freeride
Would it pass the 10 second WOT test = No - Needle and seat too small
Powerband = Bottom, midrange, top
Motor type/setup = 701 (61x cyl/62t case), heavy homemade cylinder porting, heavy case porting, 175psi head, Vforce2 reeds, Factory "mod" B Pipe, Total Loss, Tau Ceti.

 

[Matt_E]

Brand = Riva / Mikuni
Model = Powerbomb 48
Size = 48mm
Quantity = 1
Pilot Jet = 117.5
Main Jet = 132.5
Needle/Seat = 2.5
Spring = 114g
Pilot screw = 1-1/4
Main Screw = 1-1/2
Return line restrictor = 60 main
- - - - - -
Gas Octane = 93
Altitude = Sea level - 700ft
Main type of riding = Freeride
Would it pass the 10 second WOT test = YES!
Powerband = Bottom, midrange, top
Motor type/setup = 760 Frankenstein (62T cyl/61X case), heavy homemade cylinder porting, case porting, 175psi head, Factory "mod" B Pipe, Stock ignition, lightened stock Flywheel, stock F/A.

 

[special fx]

Fantastic idea!!!

 

[Sanford]

In a SN SJ:

Brand = Mikuni
Model = Retail
Size = 46mm
Quantity = 1
Pilot Jet = 120
Main Jet = 150
Needle/Seat = 2.5
Spring = 80g
Pilot screw = 1-1/4
Main Screw = 1-1/2
- - - - - -
Gas Octane = 93
Altitude = Sea level
Main type of riding = Freeride
Would it pass the 10 second WOT test = YES!
Powerband = Bottom to midrange
Motor type/setup = 701 (61x cyl/61x case), mild cylinder porting, 180psi head, Boyson Pro series reeds, Factory "limited" B Pipe, stock F/A.

 

[Crab]

How about some specs. for a type 4 drypipe and A/M dual carbs?

 

[just joe]

Legal Disclaimer: The information provided here is only to be used as a guideline and should not be used as the definitive answer. Jetting should only be performed by experienced mechanics. Improper jetting will result in severe engine damage.

:haha:

RN SJ

Brand = Mikuni
Model = I-body
Size = 40mm
Quantity = 2
Main Jet = 155
Pilot Jet = 80
Needle/Seat = 2.0
Spring = 80
Pilot screw = 1.0
Main Screw = 1.5
(June setting)
- - - - - -
Gas Octane = 93, 40:1, 30% castor
Altitude = sea level
Main type of riding = freeride
Would it pass the 10 second WOT test = all the time
Powerband = mid to high
Motor type/setup = Riva TJ 61X cyl, 62T case, 167lbs comp, Type IV dry pipe w/200 jet, MSD TL, VF2 reeds

Static timing: 29
Start ret: 5000
Rev: 8250
Final timing: 12

 

[junkman]

Killer Thread!

 

[godocgo]

blaster


Brand = Mikuni/novi
Model = ?
Size = 48 mm
Quantity = 2
Main Jet = 150
Pilot Jet = 155
Needle/Seat = 2.5
Spring = gold
Pilot screw = 1.0
Main Screw = 1.0

- - - - - -
Gas Octane = 110, 32:1 klotz r50
Altitude = sea level
Main type of riding = race
Would it pass the 10 second WOT test = all the time
Powerband = low to mid and high
Motor type/setup = judge race ported dasa pv 8 mil stroker, 62T case, 200+ compression, octane dry pipe, MSD TL, VF2 reeds

almost the same jetting on my ss motor with novi's and speedwerx pipe otherwise similar with standard stroke and big bore 61x cylinder

 

[Sanford]

Please, keep this going. A database is useless without your input.

Where are all the tuners and weekend warriors because :sucks: without YOU!

 

[Sanford]

Only 4 people with carbs and mods?

 

[SuperJETT]

Only 4 people with carbs and mods?

While this is a nice idea in theory, I have found that a lot of people have deficiencies in their carb tuning, like a lean spot, or rich, etc. Unless I've ridden a ski and know it's tuned properly, then to me these numbers are worthless.

This is not to disrespect anyone that has posted, and I'm also not saying my tuning is perfect either. I just think that to post numbers/setups here, your engine should run like an electric motor, perfectly tuned, pull the throttle a little more and it revs a little more, etc. My current setup is not like that, it's close, but I still have some tweaking to do and it's 100% rideable.

Also, there are sooo many variables to this it's not even funny.

 

[Matt_E]

I just think that to post numbers/setups here, your engine should run like an electric motor, perfectly tuned, pull the throttle a little more and it revs a little more, etc.

That's exactly how my setups run/ran. :biggthumpup:

However, it took a while to get there.

 

[Kaveman]

Brand = Mikuni
Model = Full Spectrum
Size =48mm
Quantity = 2
Main Jet = 132.5
Pilot Jet = 122.5
Needle/Seat = 1.8
Spring = 95g
Popoff=23psi
Pilot screw =1.25
Main Screw = 1.00
- - - - - -
Gas Octane = 114 rockett brand 40:1 maxima super m
Altitude = 700
Main type of riding = flatwater freestyle
Would it pass the 10 second WOT test = yes
Powerband = IMMEDIATE HUGE hit, hard pull throughout
Motor type/setup = 840cc pv lamey, freestyle porting (lpw), 6mm stroker(stock length rod), 85mm r&d dominator, ada girdled 26cc flattop domes, 238psi (with power valves installed), factory "B" mod, boyesen manifold and r131A rad valves, mildly ported 62t cases, fly racing flame arrestors, pro digital tl, 26 static, retard begin 5000, limit 8500, total retard 14, final 12

Disclaimer: The infor lamey pmation provided here is only to be used as a guideline and should not be used as the definitive answer. Jetting should only be performed by experienced mechanics. Improper jetting will result in severe engine damage.

 

[feartheride]

While this is a nice idea in theory, I have found that a lot of people have deficiencies in their carb tuning, like a lean spot, or rich, etc. Unless I've ridden a ski and know it's tuned properly, then to me these numbers are worthless.

This is not to disrespect anyone that has posted, and I'm also not saying my tuning is perfect either. I just think that to post numbers/setups here, your engine should run like an electric motor, perfectly tuned, pull the throttle a little more and it revs a little more, etc. My current setup is not like that, it's close, but I still have some tweaking to do and it's 100% rideable.

Also, there are sooo many variables to this it's not even funny.

True but still gives people a starting point and will give people somewhere to go rather then another what jetting should I use thread:banghead::banghead:

 

[aqua]

what everyone running dual carbs needs to add is whether or not the crossover tube is filled on the intake. this makes a huge difference in jetting.

 

[aqua]

Brand =mikuni
Model =sbn oem
Size =38
Quantity =2
Main Jet =132.5
Pilot Jet =70
Needle/Seat =1.5
Spring =115
Pilot screw =3/4
Main Screw =1 5/8
- - - - - -
Gas Octane =89
Altitude =600ft
Main type of riding =freestyle
Would it pass the 10 second WOT test =yes
Powerband =low mid
Motor type/setup = 709cc 61x home ported, ada 37cc domes, cross over tube filled in manifold, factory b mod pipe, choke plates removed, cases ported.

 

[Sanford]

While this is a nice idea in theory, I have found that a lot of people have deficiencies in their carb tuning

I believe my setup on my RNSJ is VERY typical and quite possibly, very common. (all) My chit runs like an electric motor without any flat spots. I'm real fussy about that. If you find most have a poor running motor, maybe after reading some of these specs they will improve (learn?) on what others have spent a good deal of time with "tuning."

There are no guarantees in life and YMMV!!!

Like I originally said...

The information provided here is only to be used as a guideline and should not be used as the definitive answer. Jetting should only be performed by experienced mechanics. Improper jetting will result in severe engine damage.

 

[Flash-FX]

Thanks Sanford! Although every ski/motor setup/riding environment is different, this thread really helps to sort things out in a more organized fashion. I've searched for hours trying to find similar carb settings like mine and they are scattered everywhere. This is a good starting point.
I will post my info when things get "dialed in" better.

:brap: