Carburetor (specs) Database: SuperJet and Blaster 1

[eel]

Brand = fullspec
Model = 48
Size = 48
Quantity = 2
Main Jet = 135
Pilot Jet = 122.5
Needle/Seat = 2.0
Spring = 95
Pilot screw = 1 to 1/2
Main Screw = approx 1/2
- - - - - -
Gas Octane = 98
Altitude = 0
Main type of riding = surf freeride
Would it pass the 10 second WOT test = yes
Powerband = everywhere
Motor type/setup = eel 73mmX83mm 61x/62t

 

[Seb62T]

Brand = Mikuni
Model = (From XL760)
Size = 44mm
Quantity = 2
Pilot Jet = 110
Main Jet = 130
Needle/Seat = 2.0
Spring = 95g
Pilot screw = 1-1/2
Main Screw = 1-1/4
- - - - - -
Gas Octane = 98
Altitude = Sea level
Main type of riding = Freeride
Would it pass the 10 second WOT test = YES !!
Powerband = Bottom to midrange
Motor type/setup = 760 (62T 84.25mm cyl/62T case), soft case porting, 165PSI ADA Girdled head, VFORCE 2 reeds, Factory "limited" B Pipe, 650 cutted F/A with 2 screens, 4° static advance on stock CDI, R&D ported intake manifold, dual signal lines/ dual fuel lines.

 

[Mike W]

lets keep this going...

 

[special fx]

701 Stock bore 61x
Wet Jet intake w/stock reeds
46mm carb
FX-1 B-pipe
Freestyle ported cylinder (from template)
Lightened/balanced flywheel

tried a lot of jetting combos, here's what worked for me:

12psi popoff w/2.3 needle & seat
115 low speed jet
145 high speed jet
low screw out 1/2 turn
high screw out 1 1/2 turns

 

[JetSkiDood]

Resurecting an oldie.....

I have seen several threads linking to this one......I think it is a great idea. I started on a DB for part numbers to cross referance between models. Ideally I would like to make an application that would be free to all and include PN's and everytihing.....big project, but if you have skills that would help and would like to contribute some time, let me know.......

 

[stand-up-pride]

i got a stock 760 with a single 46 oem exhaust any thoughts before i get into it. It has reeds, compression and an msd. i was thinking like
Brand = Mikuni
Model = SBN
Size = 46mm
Quantity = 1
Pilot Jet = 120
Main Jet = 135
Needle/Seat = 1.5
Spring = 80g
Pilot screw = ?
Main Screw = ?

 

[kevbo]

Your pilot and pop-off should be a bit lean with the specs you listed. I would drop the spring to 65G and get all pilot jet sizes from 120-130. The pilot jets meters nearly all fuel flow at 1/4 throttle, so its easy find what you need. I like popoffs around 25psi, you can use more or less, a 2.0 needle allows a wide range with the available springs. The only safe way to find the high speed setting is by opening the needle 3 turns and see if it fourcycles at full throttle. If it does then start closing the needle until it cleans up and note how many turns out. If out more than 2 turns use a larger main jet and repeat the test. I would buy a 150 and 170 main and start with the 170. Its very foolish to use settings from a different boat when its so easy to find what is correct for yours.

 

[hangtime]

Great thread but keep in mind that even though you might have the exact same motor setup as someone else ,their jetting system might not work for you .

Certainly a good starting point for ideas though .

I noticed that a few people have real similar setups as me but I'm jetted differently then them .

here's mine

Brand = mikuni
Model = oem
Size = 38
Quantity = dual
Main Jet = 137.5
Pilot Jet = 75
Needle/Seat = 1.5
Spring = 95 g stock spring
Pilot screw = 1
Main Screw = 1/14
F A type = stock
- - - - -
Gas Octane = 93
Altitude = sea level
Main type of riding = ocean riding
Would it pass the 10 second WOT test = yes
Powerband = all the way through
Motor type/setup = PCM ported 701 62t/61x ,b-pipe TNT,msd,ada185comp,

 

[BROSS]

Brand = mikuni
Model = oem
Size = 38
Quantity = dual
Main Jet = 135
Pilot Jet = 65
Needle/Seat = 2.0
Spring = 65g/22-25psi popoff
F A type = stock
- - - - -
Gas Octane = 93
Altitude = sea level
Main type of riding = flatwater/boat wake
Would it pass the 10 second WOT test = yes....pipe is set up for bottom end.
Powerband = low to mid
Motor type/setup = Ported 701 61x/62t, b-pipe, MSD enhancer, head-185psi, 6m6/61x electrics, 13/17 solas concord, WW cone, bored nozzle.

Soon to be 771 flat top:smokin:

 

[Shonuff]

Memory Post

 

[Mike W]

Changed my setup a bit. Still working on my jetting and I will post what I end up with when I'm done:
Brand = Mikuni
Model = Retail
Size = 46mm
Quantity = 1
Main Jet = 135
Pilot Jet = 125
Needle/Seat = 2.0
Spring = 115
Popoff = 28psi
Pilot screw = 7/8
Main Screw = 2
- - - - - -
Gas Octane = 93
Altitude = sea level
Main type of riding = freestyle/freeride
Would it pass the 10 second WOT test = Dont know. Not going to try.
Powerband = low/mid
Motor type/setup = 62T/61X (unported), ATP Intake, V Force 3 reeds, Stock F/A

 

[hangtime]

Aren't you supposed to go to the next jet size if your more than 1 full turn out ???

Changed my setup a bit:
Brand = Mikuni
Model = Retail
Size = 46mm w/ Riva intake
Quantity = 1
Main Jet = 130
Pilot Jet = 125
Needle/Seat = 2.3
Spring = 95gm
Pilot screw = 1 1/8
Main Screw = 2 1/2
- - - - - -
Gas Octane = 93
Altitude = sea level
Main type of riding = freestyle/freefide
Would it pass the 10 second WOT test = probably but not going to try
Powerband = low/mid
Motor type/setup = 62T/61X unported

 

[Mike W]

Aren't you supposed to go to the next jet size if your more than 1 full turn out ???

Yes but I just have not got around to doing it. Been busy lately.

edit: accually I was at 1 1/2 turn out with my stock F/A but I went with a Tau Ceti. It took an entire turn out to get rid of the lean hesitation.

 

[Matt_E]

Lowering popoff may be a better way to go.

 

[ventec]

Drypipe

Anyone running a drypipe factory or sppedwerx?? with dual 44 or 46mm??

 

[doctorrob]

what is the deal with pop off pressure--i keep reading using the 115 spring or 95--what is the problems incurred when using 65 gram spring lowering pop off pressure? i am running
oem 38 mikuni
140 main
75 pilot
1.5 needle
65g spring
high speed screw at 1
low speed at 1
pro-k's, b-pipe, ada head 35 cc domes, enhancer, riva light flywheel, bubba at riva port work, v-force reed cages/reeds, doukas water box
i think or should i say i guess my pop off is too low-----any issues running it around 30 psi pop off??

 

[Matt_E]

Read this first.

Popoff pressure controls how much vacuum in the intake tract it takes before the fuel supply needle "pops" open.
In short, it affects the fuel delivery curve on the bottom end of the RPM range.
A lower popoff pressure will provide fuel sooner. However, excessively low popoff values may result in fuel dribbling.
It is very much dependent on the setup you run.

Btw, popoff is determined by a combination of the size of the needle valve and the spring.

 

[doctorrob]

pop off

ok but does running a lower pop off have any ill effects other than fuel dribbling? is it better to run the 95 gram spring? the 115? the reason i am asking is because my cylinder looks a bit "fuel washed".---i think...

 

[Matt_E]

Don't concentrate on springs. Concentrate on popoff pressure numbers.

If your cylinder is fuel washed, it may be because it's too rich.
Please read the manual I linked. It will answer many questions.

The point is this: an engine can be tuned to run right at various popoff pressures. There are five factors here: low adjuster, popoff pressure, pilot, main, hi adjuster.
All need to be tuned right.
Simply raising your popoff may or may not cure the rich condition. I suggest familiarizing yourself with how the carburetion system works and tuning it right.
Or, if you are not comfortable with that, find a pro that can do it for you.

 

[waxhead]

Matt is right
think of the jets as the amount it flows and the pop off pressure as when the fuel starts to flow
If you have pop off to low trying to get more fuel then you will not get the right throttle reponse
If you keep pop off to high trying to lean it out you may find you get a rich area in the mid range
Its all about understanding how carbs work and what your engine is telling you

Even high pop off will dribble
Needle and seats are a wearing item and they need to be replaced