BST36SS "Slingshot" Carb Question

[Carter Turk]

I was joking about the methods of this jet kit and that one.
With regard to the pilot jet, I was merely mentioning what I was running.
His readings of richness at low rpms/throttle openings, seems to suggest a smaller unmodifed motor wouldn't like such large pilots (40).
Says the neanderthal talking to the engineers whose test methods I'll never grasp.

The tuning method is based on the carburetor designs and not the specific type of jet.

The main jet feeds the needle/emulsion tube so adjusting the needle without having the main set is meaningless because it will change again once the main is set. IIRC the pilot might be independent but it is such a small contributor, it would be like using the fine adjust on a meter and then as a final set set the coarse adjust. Changing the coarse adjust totally invalidated the fine adjust.

Granted with a O2 Sensor (at various throttle settings) you can make pilot and needle adjustments together easier, you still do the main first.

Without the O2 sensor you are at such a disadvantage that it is pretty much a waste of time to do anything that the order of adjustment mention.

 

[posplayr]

I was joking about the methods of this jet kit and that one.
With regard to the pilot jet, I was merely mentioning what I was running.
His readings of richness at low rpms/throttle openings, seems to suggest a smaller unmodifed motor wouldn't like such large pilots (40).
Says the neanderthal talking to the engineers whose test methods I'll never grasp.

sorry, I did not pick up on the irony although I was a bit surprised by the comment .
Hope I was not being too pedantic.

 

[TxGSrider]

I actually think I may be chasing down the "perfect" needle position forever as long as I keep using the DJ Gsxr1100 needles. I believe the taper is probably too steep so when I get it set right at 1/2 throttle its a little too lean at 1/4 throttle and a little too rich at 3/4 throttle. It may also be the cause of some of my rich mid-rpm reading at full throttle. Theres a pretty big difference in a fuel curve for a 140+hp GSXR from a 110hp GS1100. I do have a set of DJ needles for a GSX1100G (bst36ss, similar hp to my gs) that I have yet to try, just by looking at them, there doesn't seem to be hardly any difference in shapes, but I suppose that dealing with .001" differences may be a little hard to see. I was just trying to get it in the ballpark before making anymore changes (like the needles). One change at a time is usually the best method.
Also, I broke down and bought another LM-2 so I can continue testing again after I get back from a little vacation this weekend.

 

[posplayr]

I was using the DJ needles from the gs1100-1150 kit and came to a similar conclusion. I think it ran a little rich but without a dyno I had no way to convert afr to hp so it became a "close enough" situation. I had actually considered trying to sand down the needles a bit to make adjustments but in the end that was going to take too much effort.

sorry this was on the bs36 carbs .