Quinc
Buy a Superjet
- Location
- California
Carburetor (specs) Database: SuperJet and Blaster 1
- Thread starter Sanford
- Start date
unfortunately, since there are not alot of riders with the taper bores and my setup, neither group k or jetmaniac can reccommend settings. Jetmaniac did reccommend to go richer since the new motor will need more fuel than before. I was at 145 hsj before at 1 1/2. I was really hoping for at least one person with taper bores to put up their settings.. After I got the carbs back from group k, I had jetting adjusted by local shop who at least got it running but there was a low speed hesitation and would go into limp mode on wol. After reading every article on jetting out there, I started adjusting myself. It was running good at the end of last season.. at the previous settings and 145, but loaded up on idle, (lsscrew needed a little adjustment) Well, I guess better to start too rich than too lean.
Quinc
Buy a Superjet
- Location
- California
@speedysprocket Also does taper boring for 38's. He might have an idea on jetting changes after boring.
- Location
- ocean city Maryland
What's a good base tunE for a stock bore 61x with single 44 mikuni and a factory b pipe
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cookn
Kamikaze
- Location
- where you live
@eastcoastx2
Main Jet : 145
Pilot Jet : 120
High speed screw : 1-2 turns out from closed
Low speed screw : 2 turns out from closed
Needle & Seat : Stock
Spring : 95 gram
these specs are from factory pipe website, so If i remember stock 61x jetting you are going up from 135 main and 115 pilot and changing the spring to 95gram
Main Jet : 145
Pilot Jet : 120
High speed screw : 1-2 turns out from closed
Low speed screw : 2 turns out from closed
Needle & Seat : Stock
Spring : 95 gram
these specs are from factory pipe website, so If i remember stock 61x jetting you are going up from 135 main and 115 pilot and changing the spring to 95gram
So I was looking on here and couldn't find exactly what I may need for a good starting point so if anyone has any ideas for me that would be awesome!
Just got a new motor and can't decide to run with the 38s it came with (like jet maniac suggested (I should probs go with his suggestion)) or tune the 44s I have.
So with 44s
B pipe
R and d intake
Ada head with 35's I think
Jet maniac 771 ported motor.
V force reeds
Solas mag 144
10/16 prop.
At 600-1100 ft alt.
Would like to add msd enhancer, lightened flywheel, bored reduction nozzle. If these would change jetting at all.
Just got a new motor and can't decide to run with the 38s it came with (like jet maniac suggested (I should probs go with his suggestion)) or tune the 44s I have.
So with 44s
B pipe
R and d intake
Ada head with 35's I think
Jet maniac 771 ported motor.
V force reeds
Solas mag 144
10/16 prop.
At 600-1100 ft alt.
Would like to add msd enhancer, lightened flywheel, bored reduction nozzle. If these would change jetting at all.
Mike W
Infidel
- Location
- North Florida
If you prefer plug and play, go with the 38s. My JM 735 was spot on with minimal tuning.
- Location
- Austin, Texas
I have a 735 with similar setup, except with All the stuff you want to add and running a 9/15 hooker. Matt at HPE suggest this jetting and it was almost perfect except had to adjust low and high speed a little.
GP760 44's a good starting point is
115 pilot
125 mains
1.5 n/s
65 gram springs
1 1/2 high and low to start with.
Remember may need bigger main since a 771.
i just finished to jet my 44s and it runs perfect.
main jet- 100 (started with 120 and had to go down to 100)
pilot jet- 115
needle- 2.0
spring- 95gr
high needle- .75
low needle- 1.25
should have 25psi pop-off, tried few different springs to get it correct (all new 95gr springs read 22-27psi pop off)
i run the carbs with dual separate stock air boxes (leaves more room)
i have stock engine fresh bored to 82.5mm. i use the stock 760 intake with blocked cross-over.
ada head 37cc, msd enhancer, b-pipe, mag pump, 9\15 prop, vforce3, tbm light flywheel, rrp couplers.
main jet- 100 (started with 120 and had to go down to 100)
pilot jet- 115
needle- 2.0
spring- 95gr
high needle- .75
low needle- 1.25
should have 25psi pop-off, tried few different springs to get it correct (all new 95gr springs read 22-27psi pop off)
i run the carbs with dual separate stock air boxes (leaves more room)
i have stock engine fresh bored to 82.5mm. i use the stock 760 intake with blocked cross-over.
ada head 37cc, msd enhancer, b-pipe, mag pump, 9\15 prop, vforce3, tbm light flywheel, rrp couplers.
Mike W
Infidel
- Location
- North Florida
Just tuned my B1 and it's spot on.
Brand = Mikuni
Model = OEM
Size = 44
Quantity = 1
Main Jet = 140
Pilot Jet = 120
Needle/Seat = 2.0
Spring = 115
Pilot screw = 2
Main Screw = 2
- - - - - -
Gas Octane = 89 ethanol free
Altitude = sea level
Main type of riding = flat water
Would it pass the 10 second WOT test = sure
Powerband =
Motor type/setup = 61x/61x totally stock with Riva red pipe, stock f/a with three screens
Brand = Mikuni
Model = OEM
Size = 44
Quantity = 1
Main Jet = 140
Pilot Jet = 120
Needle/Seat = 2.0
Spring = 115
Pilot screw = 2
Main Screw = 2
- - - - - -
Gas Octane = 89 ethanol free
Altitude = sea level
Main type of riding = flat water
Would it pass the 10 second WOT test = sure
Powerband =
Motor type/setup = 61x/61x totally stock with Riva red pipe, stock f/a with three screens
Brand = Mikuni
Model = Novi
Size = 48
Quantity = 2
Main Jet = 135
Pilot Jet = 147
Needle/Seat = 2.5
Spring = 65g
Pilot screw = 1
Main Screw = 3/4
- - - - - -
Gas Octane = 94
Main type of riding = Flatwater
Would it pass the 10 second WOT test = I think so
Motor type/setup = 910cc ADA 5mm stroker , novi 48, boyseen reeds/intake, powerfactor, msd enhancer
Model = Novi
Size = 48
Quantity = 2
Main Jet = 135
Pilot Jet = 147
Needle/Seat = 2.5
Spring = 65g
Pilot screw = 1
Main Screw = 3/4
- - - - - -
Gas Octane = 94
Main type of riding = Flatwater
Would it pass the 10 second WOT test = I think so
Motor type/setup = 910cc ADA 5mm stroker , novi 48, boyseen reeds/intake, powerfactor, msd enhancer
- Location
- Winston Salem, NC
Was this your final carb settings? If so, how was the throttle response on the bottom to mid?
Thanks,
Kevin
Mike W
Infidel
- Location
- North Florida
Final for now. Throttle response is crisp all through the powerband. No hesitation at all when I nail it. Waiting to run a couple tanks to see what the piston wash looks like. But the plugs look good.
- Location
- Washington
Picked up my first ski, starts up and runs but not making power above 5/8 to 3/4 throttle, had it out today after reading all 17 pages trying to tune it but didn't have much luck. I tried pilot screw 7/8 to 1 1/4 and main screw 1 1/4 all the way to 2.5 out and everything in between with not much change. seems to be running lean i tried a plug chop at 2 out on the main and all white ceramic.
Current mods are:
Dual 38's prok F/A's
High comp head 35cc domes
Port matched coffman sizzler/TDR waterbox
Jetski solutions coil with msd boots
Dual cooling
Current carb specs:
Brand= Mikuni
Model= OEM
Size= 38
Quantity= 2
Main Jet= 135
Pilot Jet= 70
Needle/Seat= 1.5
Spring= 95
Pilot Screw= 7/8
Main Screw= 1 1/4
running 92 octane 40:1 castor 927. 500-800 above sea level. Looking for low to mid end power I was going to order a rebuild kit with new mains and needle/seat, any suggestions would be greatly appreciated
Current mods are:
Dual 38's prok F/A's
High comp head 35cc domes
Port matched coffman sizzler/TDR waterbox
Jetski solutions coil with msd boots
Dual cooling
Current carb specs:
Brand= Mikuni
Model= OEM
Size= 38
Quantity= 2
Main Jet= 135
Pilot Jet= 70
Needle/Seat= 1.5
Spring= 95
Pilot Screw= 7/8
Main Screw= 1 1/4
running 92 octane 40:1 castor 927. 500-800 above sea level. Looking for low to mid end power I was going to order a rebuild kit with new mains and needle/seat, any suggestions would be greatly appreciated
- Location
- Michigan
Need assistance:
Been trying to tune my single 44 but can't get that perfect sweet spot.
61x ported cylinders
Freshly bored to 82mm
Stock x cases
PSI pipe
ADA head 35cc domes
Stubby cone
Bored nozzle to 86mm
Solas 13/17 prop
Riva cone F/A
Stock ignition
Carb specs:
Brand = Mikuni
Size = 44
Quantity = 1
Main Jet = 150
Pilot Jet = 125
N/S = 1.5
Spring = 65g (tried 95g also)
Pilot Screw = 1.5
Main Screw = 1.5
Currently running 32:1 93 octane since I'm still breaking the bore in. Usually run 50:1. Looking for that low end grunt. Freestyle rider of course! Plugs are usually black and wet and I'm always running overly rich. What would the desired popoff be and should I be using 2.0 or 2.3 N/S? Any advice would go a long way! Thanks.
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Been trying to tune my single 44 but can't get that perfect sweet spot.
61x ported cylinders
Freshly bored to 82mm
Stock x cases
PSI pipe
ADA head 35cc domes
Stubby cone
Bored nozzle to 86mm
Solas 13/17 prop
Riva cone F/A
Stock ignition
Carb specs:
Brand = Mikuni
Size = 44
Quantity = 1
Main Jet = 150
Pilot Jet = 125
N/S = 1.5
Spring = 65g (tried 95g also)
Pilot Screw = 1.5
Main Screw = 1.5
Currently running 32:1 93 octane since I'm still breaking the bore in. Usually run 50:1. Looking for that low end grunt. Freestyle rider of course! Plugs are usually black and wet and I'm always running overly rich. What would the desired popoff be and should I be using 2.0 or 2.3 N/S? Any advice would go a long way! Thanks.
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Quinc
Buy a Superjet
- Location
- California
try a 2.0 seat 95g spring and 155 main jet.
- Location
- Michigan
try a 2.0 seat 95g spring and 155 main jet.
What would an ideal popoff be for my setup? And what is the best way to adjust high and low screws? Seems like there are many ways to go about it. Mikuni says to dial in the idle screw till a steady idle then turn low speed 1/4 in or out till engine rpm rises. Tried that yesterday but couldn't find that spot where rpm increased.
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