Super Jet Carb screw adjustment recommendations (62t\62t)

[ncbrock]

I just put new jets in my 38's. 140 mains, 70 pilot, 2.0 needle\seat, 95 gram spring (have 115 if that doesnt work) I need a good base idea on where to tune my screws. I have terrible access to them while on the ski, so while the carbs are off id like to get them as close as possible. The only thing aftermarket on the motor is a b pipe.

 

[sjetrider]

check this page bro all ya need to know.
http://www.factorypipe.com/media/instructions/yamaha/701SJ01.pdf

 

[ncbrock]

ok and just to make sure, which adjusters coorespond to "high speed" and "low speed" jets?

 

[Mark44]

Low is on the right as you are looking at the diaphragm cover or same side as idle stop screw high is on left.

Mark44

 

[ncbrock]

thanks, im going out tomorrow for a ride, hopefully the jets fixed my issues

 

[onedumbtrucker]

check this page bro all ya need to know.
http://www.factorypipe.com/media/instructions/yamaha/701SJ01.pdf

I talked to factort pipe about those numbers yesterday and they are for a single SBN44 not the dual SBN38's
you want this one;
http://www.factorypipe.com/media/instructions/yamaha/701SJ03.pdf

 

[ncbrock]

Well after reading everything on fp's website, I cant get it right. It just bogs with any range of throttle. I left the high speed screws alone at 1 1\2 turns out, and started to try the low speeds, started with 1\2 turn out, and turned in 1\2 increments. I couldnt get anything right, so I left the low's at the recommended 1 1\4 turns out, and tried the same with the highs, I felt no difference, and ran like crap every time I tried it.
Everything internally looked great on the carbs, all the seals and gaskets looked good. Double checked everything that it went back together ok, but with it running like crap in the first place before I changed jets, I cant base anything off that.

 

[Waternut]

Easiest way to remember which screw is which is... low speed screw is lower than the high speed screw.

 

[ncbrock]

Im beginning to wonder if its my overheat\limp mode sensor.

 

[keith t]

Im beginning to wonder if its my overheat\limp mode sensor.

disconnect it then, its the black / pink wires

 

[ncbrock]

should i disconnect it inside the ebox? or just take it out of the head? If I disconnect it from the ebox should i do something the unused connector?

 

[jetski9010]

disconnect it from inside the ebox. Just leave the connector's in there.

 

[ncbrock]

got everything almost worked out, removing the sensor helped. I cant really tell if its hesitation or bogging, but if I grab a handful of throttle it will hesitate\bog for 1 second then it will rip. I think im 1 turn out on the lows, and 1\2 turn out on the highs. Throttle response is good, its just when putsing around doing setup wakes then I get setup and grab the throttle its brrrrrrrrrr then BRAAAPP like a light switch. If I can get the pump to slip a little and get it into the higher rpms then it will rip really hard.
I have it so close, what should I adjust?

 

[Mark44]

got everything almost worked out, removing the sensor helped. I cant really tell if its hesitation or bogging, but if I grab a handful of throttle it will hesitate\bog for 1 second then it will rip. I think im 1 turn out on the lows, and 1\2 turn out on the highs. Throttle response is good, its just when putsing around doing setup wakes then I get setup and grab the throttle its brrrrrrrrrr then BRAAAPP like a light switch. If I can get the pump to slip a little and get it into the higher rpms then it will rip really hard.
I have it so close, what should I adjust?

Read first.

http://www.x-h2o.com/threads/39846-Tuning-tips-for-Rookies.

 

[BruceSki]

when I was running a stock motor with a b pipe I ran 135 mains with 75 pilots. I had stock flame arrestor so I left the spring alone.

 

[ncbrock]

I still cant get it, im leaning towards more electrical problems. Tunning the carbs does nothing other than make the "lightswitch" power come faster or slower, I think if it was JUST a carb problem that I would be able to tune out a low bog. Im thinking coil.