Carburetor (specs) Database: SuperJet and Blaster 1

[Mike W]

I finally dialed in my carb today so I updated my original post (#51). Needless to say I learned alot. Goes to show that every ski is different because my jetting don't match any that I found on here. Mine liked high popoff which ended up around 30psi which was the ticket for getting rid of the "gurgle" at low speed. Went back to my stock flame arrestor as well.

 

[Matt_E]

Got one to add....


Brand = Dual Full Spectrum 48
Model = FS 48
Size = 48mm
Quantity = 2
Pilot Jet = 122.5
Main Jet = 135
Needle/Seat = 1.8
Spring = 95g
Popoff = 24psi
Pilot screw = 1
Main Screw = 1/2
- - - - - -
Gas Octane = 92
Altitude = Sea level
Main type of riding = Freeride
Would it pass the 10 second WOT test = YES !!
Powerband = Everywhere
Motor type/setup = 760 (61x 84.00mm cyl/62T case), cases ported, cyl ported, ADA Girdled head, Boyesen Dual Stage reeds, Factory Mod B Pipe, Proks, 4° static advance on stock CDI, R&D ported intake manifold, teed pulse lines/ dual fuel lines

 

[Tony]

Hey guys, just change my dual oem 38´s for dual 46 mikuni... What is the proper jetting specs?? Isn´t working good... Has a B pipe, Enhancer, V-Force reeds...

Thanks a lot

 

[Big Kahuna]

search this thread, keep in mind that it is only a starting point.

 

[dawson]

i have a set of 2 x 48 buckshots laying around i was going to put on my b1 surf hack
it has b pipe limited
stock ignition
boysen reeds
old school 61x cases with r&d twin carb manifold
38cc domes

can some one give me a close starting point on what to run
it currently has a signle 44 on it

 

[bad93blaster]

i have a set of 2 x 48 buckshots laying around i was going to put on my b1 surf hack
it has b pipe limited
stock ignition
boysen reeds
old school 61x cases with r&d twin carb manifold
38cc domes

can some one give me a close starting point on what to run
it currently has a signle 44 on it

i had that setup years ago. i remeber the jetting was up side down that is all i remeber

 

[waxhead]

Do yourself a favour Dawson and dont

 

[Mark44]

l

Do yourself a favour Dawson and dont

Listen to Wax he knows carbs!

Mark44

 

[dawson]

Do yourself a favour Dawson and dont

i was woundering how long it would take for you to call me about this LOL

 

[DAG]

my set up on OEM and AM carbs

===========

Brand = Mikuni
Model = Retail OEM
Size = 44mm
Quantity = 2
Main Jet = 100 H
Pilot Jet = 115 L
Needle/Seat = 2.3
Spring = 80
Pilot screw = adj 7/8 turn out
Main Screw = adj 1 turn out
- - - - - -
Gas Octane = 93
Altitude = a tick above sea level
Main type of riding = flatwater
Would it pass the 10 second WOT test = idk, 10seconds is along time:ugh:
Powerband = low-mid
Motor type/setup = see My Ski LPW ported 760 62t/62t, 180 psi, vforce2, b mod pipe, enhancer, prox FA's

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


===========

Brand = Mikuni
Model = AM
Size = 44mm
Quantity = 2
Main Jet = 115 H
Pilot Jet = 120 L
Needle/Seat = 2.0
Spring = 95
Pilot screw = adj 1.5 turn out
Main Screw = adj 1 turn out
- - - - - -
Gas Octane = 93
Altitude = a tick above sea level
Main type of riding = flatwater
Would it pass the 10 second WOT test = idk, 10seconds is along time:ugh:
Powerband = low-mid
Motor type/setup = see My Ski LPW ported 760 62t/62t, 180 psi, vforce2, b mod pipe, enhancer, prox FA's

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

 

[waxhead]

Seriuosly guys come on on this 10 sec run thing
Unless its a full on massive compression engine that making huge hp
You shouldnt have to worry about a 10sec run
thik about the race engines that get built and they get run hard all the time

 

[Freestyle-Medic]

gch

 

[Freestyle-Medic]

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,

My buddy has a

oem 38 mikuni carbs, factory, b-pipe, ada head 35 cc domes, msd enhancer, cf v-force reeds, and wants to know what to set his b-pipe to he has no clue on all of the screws and mine was set for me by a shop so can anyone help out with this one and give some adivce cuz his pipe coming off the adjustment pipe seems to be heating up at times. Or is there a page on the specs on what turns do what for the pipe

 

[Big Kahuna]

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

Brand =-------Mikuni
Model =-------SBN
Size =---------44
Quantity =-----1
Main Jet =-----145
Pilot Jet =-----120
Needle/Seat =- 2.0
Spring =------ 65 gram
Pilot screw = --1.25 turns
Main Screw =--2.25 turns

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

Brand = Mikuni
Model = OEM
Size = 44mm
Quantity = 2
Main Jet = 115
Pilot Jet = 120
Needle/Seat = 2.0
Spring = 95g
Pilot screw = 1.25
Main Screw = .75
Manifold crossover blocked off






Brand = yamaha
Model = superjet
Size = 44
Quantity = dual
Main Jet = 105
Pilot Jet = 120
Needle/Seat = dont be lazy do the popoff correctly
Spring = 15-17 psi
Pilot screw = 1 turn
Main Screw = 1 turn


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

Brand = Mikuni
Model = Retail OEM
Size = 44mm
Quantity = 2
Main Jet = 100 H
Pilot Jet = 115 L
Needle/Seat = 2.3
Spring = 80
Pilot screw = adj 7/8 turn out
Main Screw = adj 1 turn out

Brand = Mikuni
Model = AM
Size = 44mm
Quantity = 2
Main Jet = 115 H
Pilot Jet = 120 L
Needle/Seat = 2.0
Spring = 95
Pilot screw = adj 1.5 turn out
Main Screw = adj 1 turn out







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


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


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


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


Brand = Full Spectrum / Mikuni
Model = Full Spectrum
Size = 48mm
Quantity = 1
Pilot Jet = 135
Main Jet = 145
Needle/Seat = 2.3
Spring = 95g - gives me 21 psi popoff
Pilot screw = 1
Main Screw = 5/8
Return line restrictor = 60 Main


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


Brand = Dual Full Spectrum 48
Model = FS 48
Size = 48mm
Quantity = 2
Pilot Jet = 122.5
Main Jet = 135
Needle/Seat = 1.8
Spring = 95g
Popoff = 24psi
Pilot screw = 1
Main Screw = ½


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




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


Brand = novi
Model = 48 Fbooster
Size = 48
Quantity = 2
Main Jet = 160front 155 back
Pilot Jet = nil
Needle/Seat = 2.5
Spring = 80
Pilot screw = 1/4
Main Screw = shut

 

[Big Kahuna]

combined all the specs.

 

[marcosagud]

Help with dual 44 Mikuni

I have a Juperjet Rius Racing edition, engine is 760, Mach 2 Exhaust and 38 carbs.
I have just installed two Mikuni 44 carbs coming from a blaster, also new 44 R&D mainfold + Spacer + Boyensen reeds.
I am crazzy with the carbs tuning. But I am not sure what can be the problem: It looks there is no fuel after some seconds...

When I go slow and I acelerate it is very fast but after 4 or 5 seconds of big aceleration it loose power and I need to decelerate, If I go slowly for some seconds I can aceleraste again faster. If I go medium speed I can´t accelerate faster, I need to reduce throte and speed. I can´t go fast, engin do not take hi RPM.
Specs:
Brand = Mikuni
Model = (From Blaster760)
Size = 44mm
Quantity = 2
Pilot Jet = 115
Main Jet = 135
Needle/Seat = ?????? What is this????
Spring = ?????? What is this????
L Screw = 2 ( I test dif. positions)
H Screw = 2 ( I test dif. positions)
- - - - - -
Gas Octane = 98
Altitude = Sea level
Main type of riding = fast speed
Would it pass the 10 second WOT test =?????? What is this????
Powerband = now bad.
Motor type/setup = 760
Boyensen reeds
Match II, stock CDI,
R&D 44 intake manifold + spacer, single standard signal lines (Y)/ single standar fuel lines (Bypass between cabs).
My e-mail is marcos_agudo@hotmail.com

Thanks. Marcos

 

[McDog]

That was a freakin awesome post BK. Does anyone know if dome size or the ignition system (total loss vs. stock) affect where the screws should be? If so, how?

 

[mindless]

Finally got my superjet running with vForce 3 reeds. Spent a lot of time fighting these reeds and stuffer in my set up. Hopefully this will help someone else tuning with these reeds/stuffers with a similar set up. Finally with the specs below, it seems to be running pretty well.

Stock 62t case/61x cylinder.
35cc dome R&D head
Factory b-pipe
stock 38 mm carbs
vForce 3 reeds with stuffers
MSD enhancer
Tau ceti flame arresters with outerwears

80 pilot jet
135 main jet
48 psi pop off

low speed 1 turn
high speed 1.25 turn

93 octane gas


I used to have Carbon Tech reeds with a reed spacer. Only difference is the pilot jet was a 70 and 1 turn out on the low speed.

 

[krusty_45]

Anybody have any set ups that ARENT at sea level?

Im up here starving for air and power at 3100 ft, building a 701, bpipe, protec rec head, 81mm, ports cleaned up and need a carb starting point.

 

[Ericfox]

Brand = Mikuni
Model = sbn
Size = 38
Quantity = 2
Main Jet = 135
Pilot Jet = 75
Needle/Seat = 1.5
Spring = 95 gram cut down just slightly
Popoff= about 43psi
Pilot screw = 7/8
Main Screw = 1 and 1/4
- - - - - -
Gas Octane = 93
Altitude = about 800-1200 (I think?)
Main type of riding = Freestyle
Would it pass the 10 second WOT test = yes
Powerband = bottom/mid
Motor type/setup = stock 61x cylinders/ TBM aluminum flywheel/ msd enhancer/ limited chamber b-pipe/ ADA girdled head about 185psi/ choke removed, flame arrestor screens removed all except 1/ Flow Control Valve/ Stock Reeds and Flame arrestor