701 dual 44's sbn jetting

xavix85 · Aug 19, 2016

i read a lot in this forum but didn't get enough confidence to try one of the suggested settings because all the other skis was different from mine. most have been ported and mine is stock. also the recommended settings are different from each other.
i want to swap from single 46 to dual 44's (oem from 760).
I'm going to use the stock manifold and stock air box from the 760.
the carbs came with : 1.5 n\s . 95gram spring. 115 pilot. 135 main.
my ski have all the bolt-on's: vf3, light flywheel,msd enhancer, head (37cc), b-pipe, rrp couplers, magnum pump, 9\15 impeller. fresh rebuild 82mm pistons. read 185\183 psi. 61x\62t.
sea level.

jonolove · Aug 20, 2016

100main 120 pilot 85g 1.5ns if you want to reverse jet it

xavix85 · Aug 20, 2016

what is the benefit from reverse jetting?
also regular base line (not reverse) is like 120m and 100p?

SELF27 · Aug 20, 2016

I have a close set like yours except ported cylinder, 35cc domes and I just put gp760 carbs and intake with choke plates removed and filled crossover but jetting right now is 115 pilot, 120 mains, 65 gram springs, 1.5 n/s. Stock flame arrestor and it runs great.

xavix85 · Aug 21, 2016

SELF27 said:
I have a close set like yours except ported cylinder, 35cc domes and I just put gp760 carbs and intake with choke plates removed and filled crossover but jetting right now is 115 pilot, 120 mains, 65 gram springs, 1.5 n/s. Stock flame arrestor and it runs great.

sounds good. what is the high needle and low needle opening? and why you closed the crossover?

SELF27 · Aug 21, 2016

xavix85 said:
sounds good. what is the high needle and low needle opening? and why you closed the crossover?

Mine are around 1 turn out on both, but I would start 1 1/2 and go from there. I have not done anykind of wot testing yet, since motor is in a bob gn 2 hull and mainly just play around, no high speed runs. There is a thread or discussion about filling crossover in FAQ I believe. For the most part it isolates each carb to that cylinder for easier tuning .

SELF27 · Aug 21, 2016

xavix85 said:
sounds good. what is the high needle and low needle opening? and why you closed the crossover?

Here's discussion on filling crossover.

http://www.x-h2o.com/index.php?threads/filling-crossover.11270/

xavix85 · Aug 24, 2016

i read this thread and still there is no "right way" to do it.
some say better with the crossover and some say that its not.

SELF27 · Aug 24, 2016

Yes, I got same thing from thread. I was recommend to do it by guy helping me with porting specs and jetting specs. I really couldn't tell you if it made any difference as far as power, but with crossover filled and jetted the way he suggested ski runs great!