need carb pros 82 GS1100E jetting

[Guest]

I have an 82 GS1100E, it has K&N oval pods, V&H 4 into 1. Right off idle it has a flat spot, not big or long, but it is there. I can barely roll on the gas, and go through the gears, and I wont feel it. But the second I pull it open say 1/8 it takes off, small gerbal, and then it goes. It doesnt even feel bad, unless you hold it right there in the nasty little spot. Wide open it goes, really hard. 1/4 throttle or more it goes good. It just has that nasty little small spot. I took the baffle out of the exhaust, and it got a little bit worse, so I am thinking it is running lean on the pilot jets.

Any help or insight would be appreciated.

[cowboyup3371]

Have you done the recommended plug chops yet and tuned from there (procedure on Basscliff's site) to find out for sure?

[Crage]

You should be able to fix this with your idle screws. A low rpm plug chop will help you.

[chef1366]

You running stock jetting?

[Texasgs]

No I put fatter mains in it years ago. I believe I bought a jet kit for it, or was it the black 81, LOL. I have 6 of these 1100E's they sat up for quite a while, but I lost track, life gets in the way sometimes. I didn't ride for years, and later I started riding again. I have always used plug readings for the mains, I have never used any type of plug reading for pilots. If you can use a plug reading to check out the pilot mixture I will try it. I am also being told I can use the idle screws to probably correct this. Any suggestions from here would be appreciated.

[koolaid_kid]

It sounds like you are having issues with the transition from the pilot jet to the needle.
There is no such thing as a pilot screw, unfortunately. There are the air/fuel mixture screws, which I address in the link in my signature. Perhaps that is what you are referring to? I admit that I have never heard of a transition issue with these screws, merely idle issues.
Texasgs, do you have a jet kit in the bike, such as a DynoJet Stage 3 kit? DynoJet spends most of their time tuning the needle, since they feel this needs the most attention on CV carbs. With pods and a pipe the Stage 3 kit is the recommended solution.
The pilot jets are really only for idle. Once you start to accelerate, you are on the needle, with some influence from the main jet.

[John Kat]

I have an 82 GS1100E, it has K&N oval pods, V&H 4 into 1. Right off idle it has a flat spot, not big or long, but it is there. I can barely roll on the gas, and go through the gears, and I wont feel it. But the second I pull it open say 1/8 it takes off, small gerbal, and then it goes. It doesnt even feel bad, unless you hold it right there in the nasty little spot. Wide open it goes, really hard. 1/4 throttle or more it goes good. It just has that nasty little small spot. I took the baffle out of the exhaust, and it got a little bit worse, so I am thinking it is running lean on the pilot jets.

Any help or insight would be appreciated.

I had exactly the same issue on my GS 1000 with CV carbs, pods and a Dynojet stage 3 kit.
It drove me crazy because I tried almost everything possible without fixing it until...I replaced the Dynojet needle by a Mikuni needle
Now I have European spec carbs and that might explain my particular issue?

[hjfisk]

I would shim the needle up a little

[Texasgs]

I meant idle mix screws, must have been late. As far as the flat spot it is gone at 1/16 throttle. If I am just barely off idle, and I mean barely it is the only time it does it. That is why I was thinking pilot jet problems.

[Texasgs]

It sounds like you are having issues with the transition from the pilot jet to the needle.
There is no such thing as a pilot screw, unfortunately. There are the air/fuel mixture screws, which I address in the link in my signature. Perhaps that is what you are referring to? I admit that I have never heard of a transition issue with these screws, merely idle issues.
Texasgs, do you have a jet kit in the bike, such as a DynoJet Stage 3 kit? DynoJet spends most of their time tuning the needle, since they feel this needs the most attention on CV carbs. With pods and a pipe the Stage 3 kit is the recommended solution.
The pilot jets are really only for idle. Once you start to accelerate, you are on the needle, with some influence from the main jet.

I will try that method you outlined, because it is a very very small stumble.

[chef1366]

I'd verify a DJ kit and put one in if not.