Super Jet Dual or Single 44 Carb 718??? Help!

[Parsonsjb88]

I have the following setup: 735cc 61X Ported Cylinders, 83mm Pro-X Pistons, Agressively Ported 62T Cases, Speedwerx High Comp Head, Ported Factory B Pipe, Dual 44sbn Carbs, MSD Enhancer, Vforce Reeds, #Zero Lightened Flywheel and 85mm Bored Nozzle, Billet Lightweight Couplers.

Due to struggles with nailing tuning last summer I am contemplating going to a single carb setup and wondering if other have experience in this area? Right now I have dual 44's, I can get my hands on an intake manifold that is a single carb to 62T cases and rejet the carb.

My main concern is I don't want to reduce my low--mid range acceleration or hurt throttle response. Would going down to the single 44 has any negatives?

 

[Roseand]

Definitely stick with the duals and get em tuned right.

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[jetx]

id stick with the duals aswell...what jetting have you been running in them?

 

[Parsonsjb88]

110 Pilots, 115 Mains, 2.0 N/S, 115g springs, 30-32psi popoff tested, ~1.5 turns out on HS, ~1.5 turns out on LS. No carbon on the pistons at all which to me meant rich so I tried leaning it out and then it wouldnt idle properly. Its idling rough, hesitation down low, however runs amazing top end. Problem is once I come down from revving high it bogs horribly down low to the point where it will nearly shut off. Blipping the throttle doesn't help, i have to hold the throttle at least 3/4+ throttle to get it to clear out and rev up. If i hold it at 1/4-1/2 throttle once it starts bogging it will just continue to bog and not rev up at all.

Any suggestions?

 

[bored&stroked]

Thought no carbon was lean. Too much fuel= incomplete burn which carbons up the cylinder/piston.

 

[Roseand]

No. No carbon means excessively rich. Unburnt fuel washes the crown clean.

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[iangdesign]

My last setup was a sport-ported 718 61x/61x with a shaved stock head and it ran a single 44. Everyone that rode the ski couldn't believe the bottom to mid range hit it had. Tuned well a single carb is the way to go IMO. Easier to tune and the best part...it sipped fuel. You could probably go with a single 46 and be good to go.

 

[Quinc]

Check your pop off with a tester or air hose and gauge to make sure you do not have a leaky seat. Should be a tight crisp Pop when it releases. Not a hiss and sputter.

 

[Roseand]

I've found all the dual carb setups I've ridden had a more aggressive hit than a single.
You've already went all out with your setup, I wouldn't downgrade your fuel system...


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[eastcoastjumper]

Use a single 44mm mikuni sbn

125 pilot
147.5 main
about 20 psi pop off
use a new 2.0 needle and seat

 

[Roseand]

Well if you endup being convinced to run a single, I'll gladly trade you a very clean 44 for your duals, lol.

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[eastcoastjumper]

once you master tuning that in, try out some dual 38's

 

[eastcoastjumper]

Well if you endup being convinced to run a single, I'll gladly trade you a very clean 44 for your duals, lol.

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Don't trade this kook

 

[Roseand]

once you master tuning that in, try out some dual 38's

Or stick with what you have and dial it in. Dual 44s rip on a ported setup..

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[eastcoastjumper]

I've found all the dual carb setups I've ridden had a more aggressive hit than a single.
You've already went all out with your setup, I wouldn't downgrade your fuel system...


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Its no downgrade. Its all in the tuning. & its not just in the carb that makes it "hit"

 

[Roseand]

Its no downgrade. Its all in the tuning. & its not just in the carb that makes it "hit"

A perfectly dialed dual 44 setup will outperform a perfectly dialed single 44. Can't tell me I'm wrong there..

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[Ducky]

No one asked, but what kind of flame arrestors are you running?

 

[eastcoastjumper]

A perfectly dialed dual 44 setup will outperform a perfectly dialed single 44. Can't tell me I'm wrong there..

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On a basic 701 like this guy has its not enough to make a significant difference.

more fuel consumption, very slight increase in power. still a 701.


Hes using starter jetting from the person he bought the ported cylinders off of and its obv not working.

 

[eastcoastjumper]

No one asked, but what kind of flame arrestors are you running?

look at his build thread, pro k

 

[Parsonsjb88]

On a basic 701 like this guy has its not enough to make a significant difference.

more fuel consumption, very slight increase in power. still a 701.


Hes using starter jetting from the person he bought the ported cylinders off of and its obv not working.

I did all the porting myself, everything is fresh rebuilt engine and carbs, and the jetting was l recommended by Jet Maniac. Just not sure where to go from here.

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