Need Help Getting Carbs Dialed in

[Anonymous]

Here is the story,

82 GS1100 GL
Newly rebuilt carbs
Jardine 4-into-2 exhaust
Emgo Pod air filters
Stage III K&N jet kit
Using K&N needles on recommended #3 groove setting
Stock pilot jets
Air Screws 1 1/2 turns out

I didn't put the K&N jets in, I am using mikuni jets - #120 - 5 steps bigger than stock #115's.

Here's what I have:

Bike starts without any choke at all.
Idles great

Cruising speed - 2000-4000 RPM I get a steady miss on all cylinders...

WOT - Pulls hard

I am guessing, based on what I've read on other threads that I have a pilot jet, or needle position issue.

Plugs are showing it running rich.

Any help would be great.
Thanks.

 

[rodcwer]

PM EARL THAT'S YOUR BEST BET

 

[stiksave]

Same problem here. I'll wait for some input.
83 gs1100 e
dynojet stage III
K&N pods
4 x1
R1 can

Idle to about 2500 runs rough, hit's the jets, squeeze your kneeze.

Thanks,
Chris

 

[KEITH KRAUSE]

PM EARL THAT'S YOUR BEST BET

Certainly no disrespect to Earl, but PM's about technical stuff only gives you one opinion, even if that opinion is a trusted one.
I get PM's about this stuff and that's the first thing I say now. It's better to get more people involved and we all read and learn.
Rice is nice, if you still need help let us know.

 

[Anonymous]

Yes, definitely.

Advise away....

 

[pano]

Stiksave

Look here for some info for a bike like yours

http://www.thegsresources.com/_forum/viewtopic.php?t=34447

 

[stiksave]

Pano,

Thanks. Did you put the DJ air jets in? Where did you buy the 50 pilots?

Thanks,
Chris

 

[pano]

I don't remember if I put the air jets in, if they were optional I probably did not.

Joe Nardy bought some #50 pilots and gave me the part#. I will look to find out where and what the part# was.

 

[hoyterb]

If you check Mikuni jets go in 2.5 increments.You only went up 2 jet sizes.This should help you.
http://www.motorcyclecarbs.com/mikuni/mikuni.htm
You didn't say if you have tried changing float height.Some times lowering the fuel level will lean the low-mid range just enough.My 82 GS850 has 115's stock.I'm going to go to 120's if you want to sell yours.If you know some one that deals with Kimpex you can get Mikuni close-tolerance jets for 1.50 each. I also have a new set of 117.5's if you want to try them.Trade?Keep trying-it just takes a while to get all the combo's right.
BTW-Did you sinc them?

 

[Jethro]

I got #50 pilot jets from Bike Bandit. I think they were $2.50 ea? They were on back order and took about 3 weeks to get to me. This was a couple of months ago.

 

[Anonymous]

If you check Mikuni jets go in 2.5 increments.You only went up 2 jet sizes.This should help you.
http://www.motorcyclecarbs.com/mikuni/mikuni.htm
You didn't say if you have tried changing float height.Some times lowering the fuel level will lean the low-mid range just enough.My 82 GS850 has 115's stock.I'm going to go to 120's if you want to sell yours.If you know some one that deals with Kimpex you can get Mikuni close-tolerance jets for 1.50 each. I also have a new set of 117.5's if you want to try them.Trade?Keep trying-it just takes a while to get all the combo's right.
BTW-Did you sinc them?

Are you talking to me or the guy who hijacked my thread?

 

[stiksave]

Hijacked? No. Shairing the same problem? Yes.

CYa

 

[Anonymous]

Bike starts without any choke at all.
Idles great

Cruising speed - 2000-4000 RPM I get a steady miss on all cylinders...

WOT - Pulls hard

I am guessing, based on what I've read on other threads that I have a pilot jet, or needle position issue.

Plugs are showing it running rich.

Hey Rice,

A couple of things first:
1) the throttle position is much more important than the rpm when sorting carb issues. Take a piece of tape and put it on your throttle housing, then mark 1/8, 1/4, 3/8, and 1/2 throttle positions so you know where you are at on the carb circuits. Telling us 2000-4000 rpm is not that useful without knowing the throttle setting. Since you say at cruising speed, I will take that to mean 1/8-1/4 throttle, which will be the pilot and needle circuits.

2) As pointed out, the 120's are only two steps bigger than the 115's.

It sounds like you are rich on your needle circuit. Instead of guessing what is going on, you need to be methodical and try things to confirm your thoughts. I would lower the needles one groove and see if that helps your problems or not. If it gets better, then you went in the right direction. Worse means the wrong direction. You need to sort the pilot and needles first, then sort the main jet. Personally, I would run the DJ jets if I was running the DJ needles, just to be sure of a matched system.

I think you will find you need several more steps on the mains before they are right. On my 82 1100E I ended up at 142.5 mains with pods and a 4-1 pipe. Stock is 107.5, for a total of 14 steps from stock. Quite a few more than you have at the moment...

Try lowering the needle and see what you get from it and let us know.


Mark

 

[Anonymous]

Ok. By lowering the needle, do you mean raising the E-clip?

 

[Hoomgar]

Rice_is_Nice. You should post this in the tech section. I am not being anal and crying whaaa you shouldn't post this in here because it isn't a performance mod, it's a tech question.

Not at all. I just know that there are a quite a few of our most knowledgable guys who don't always frequent this area of the forum but hang out all the time in the tech section. Just trying to help you muster more help man

If I knew the answer to your questions I would have posted them.


That's not to say the guys posting above don't know their stuff though. It's just a tip for future issues.

Rock on buddy

 

[Anonymous]

Ok. By lowering the needle, do you mean raising the E-clip?

Yup.


Mark

 

[Anonymous]

Ok. By lowering the needle, do you mean raising the E-clip?

Yup.


Mark

OK, just wanted to make sure.... :wink:

Also, you were correct to assume that the missing is occuring at about 1/8th throttle.....

 

[rodcwer]

PM EARL THAT'S YOUR BEST BET

Certainly no disrespect to Earl, but PM's about technical stuff only gives you one opinion, even if that opinion is a trusted one.
I get PM's about this stuff and that's the first thing I say now. It's better to get more people involved and we all read and learn.
Rice is nice, if you still need help let us know.

NO DISRESPECT MEANT IT,S JUST EARL HELPED ME WITH A VERY SIMILAR PROBLEM RECENTLY(SORRY FOR THE CAPS) .I had forgotten that you are just as knowledgeable when it comes to these matters.My bad :wink:

 

[KEITH KRAUSE]

Rice is Nice, remember, the K&N jet kits are designed with K&N pod filters in mind. It will work with your Emgo's, but the jet kits "base settings" will be richer with the more restrictive Emgo's.
Also, a good vacuum synch is required with any re-jetting. You can't get accurate plug reads or best performance without a good vacuum synch.
Also, be sure you replaced any stock jet needle spacer(s) and in the correct order, when re-installing them onto the DJ needles.
If your problem is at about 1/8 throttle position, a poor carb synch will be especially noticable. Don't try to re-jet until the carbs are synched. This is just basic maintenance. After the synch, you may find the problem is gone. If not, the carbs had to be synched anyway. Then you can focus on the pilot and needle circuits, which overlap each other at this throttle position.

 

[KEITH KRAUSE]

PM EARL THAT'S YOUR BEST BET

Certainly no disrespect to Earl, but PM's about technical stuff only gives you one opinion, even if that opinion is a trusted one.
I get PM's about this stuff and that's the first thing I say now. It's better to get more people involved and we all read and learn.
Rice is nice, if you still need help let us know.

NO DISRESPECT MEANT IT,S JUST EARL HELPED ME WITH A VERY SIMILAR PROBLEM RECENTLY(SORRY FOR THE CAPS) .I had forgotten that you are just as knowledgeable when it comes to these matters.My bad :wink:

That's what I mean! If you guys discussed this problem in "public", then this guy and others can read the info and learn.