New RS38's, what main jet to start?

[Guest]

You need to get a pingle.
It's time

[JimmyR]

Oh yeah the pingel is a must if you don't have one already. I can't help much because I am using RS36s in my GS1100, but I did discover that the pilot jet seemed to be more critical than the main jet for regular riding. Obviously both have to be right, but for getting my bike running well for around the town stuff I could use various values of main, but only one size of pilot would work.

[posplayr]

With my GS1100ED 36mm CV and 0.340 lift cams I would get fuel starvation issues in 5th gear with a stock petcock.

After the 1166, and head work it happened much quicker.

I now have a pingle single tap and don't have anymore starvation problems.

I was wondering if you believe the AFR reading from you meter. AFR 10 is pretty darn rich and you should be seeing soot on the plugs.

[gearhead13]

I have been thinking of getting a pingel for a while now, do I have to have a dual outlet or can I use my T fitting?
The a/f is in question because I ran the bike for a while with it unpowered. I recalibrated it but I dont know what effect running it unpowered would have. The plugs look fine, it runs ~13-1 at cruise and 13-14 under 1/2 throttle. 99.9% of the time I am at part throttle.
With the 130's its closer but still not right, I am thinking of pulling the carbs and rechecking my float level.

[Billy Ricks]

Make sure float height is where it's supposed to be so you're not chasing you tail on jetting. 17mm regardless of what size carbs you have.

I'm running a single outlet Pingel and granted mine is just a 700 but it never starves for fuel.

[Billy Ricks]

I just read where you stated that if you open it up it sputters. Don't worry about this too much when your just cruising along you can't just grab a handful of throttle with these carbs. They'll take a big gulp of air and a big squirt of fuel from the A/P and you lose your intake velocity. Then you have to partially close the throttle until the engine breaths right again. Without downshifting you have to roll the throttle to keep from bogging it. That lets you take the most advantage of the pump anyway. Once you get some rpm up you can keep them pegged.

[7981GS]

He has stated that he disabled the pumps.

Eric

[Billy Ricks]

He has stated that he disabled the pumps.

Eric

Still, whacking RS flatslides open at cruising speed just bogs the engine. You have the slides lifted completely instead of vacuum lifting them with CVs. No velocity equals no power.

[gearhead13]

I have opened it up at anywhere from 4-7k rpm same effect.
Are you running a single outlet with a T?
I would like to get one with reserve, dont like the idea of running out of gas and having to walk
Found a non-reserve dual outlet on sale, and a dual with reserve for $30 more

[Billy Ricks]

I have opened it up at anywhere from 4-7k rpm same effect.
Are you running a single outlet with a T?
I would like to get one with reserve, dont like the idea of running out of gas and having to walk
Found a non-reserve dual outlet on sale, and a dual with reserve for $30 more

I run a single outlet with a T and it does have reserve.

Even at 7k and steady throttle the slides aren't that far up, probably about 1/3 throttle if that. That still leaves a lot of slide lift when you whack it open and velocity goes to hell. Just for grins see how much throttle you're at when you are at 6 or 7k, probably not much.

[Guest]

Just an observation. At 3000 rpm, in 3rd gear,pointed srtraight ahead,I can go full throttle with no bog. Of course I am looking at nothing but blue sky, so panic sents in and I have to shut it off. I looked at the build sheet and I think my carbs are not 38's. I think they are 33's or 36's. maybe thats why I have bigger jets in the mains. I submit the video below to give you an idea how it runs at the track... The video starts slow but it gets better. Times are 10.30's to 10'40's with a trap speed of 125...
Curt

http://www.youtube.com/watch?v=lByQl1w-QtM

[7981GS]

http://www.youtube.com/watch?v=lByQl1w-QtM

That track looks slick!
Who keeps breaking out? I see a lot of red lights at the start.

Eric

[Guest]

If you are running solo, the other lane shows red. And the slickness is due to a 5 inch tire and a bad rider...But I am learning...
Curt

[7981GS]

I don't think so much of the slickness is a bad rider as much as it is bad track prep.

Eric

[gearhead13]

Well, I pulled the carbs last night, reset the floats to 18mm, same 130 main, dropped the needle 1 notch and tossed my inline fuel filter She pulled ok wide open, and 14-15-1 a/f at 1/4 to 3/4 throttle. Checked a plug and looked too lean. Less than 10% of the time wide open so the plug color due to the needle I think. Theres no way I can look down at the gauge wide open, have to hook up the laptop and go for a ride.
I will be ordering a pingel when I can.