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> Carb problems?
Brush
post Jan 29 2016, 06:23 PM
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Have a problem with my 01 Duece. It runs and idles fine until I hit the throttle hard to pass someone. It starts to crap out, coughing and popping. I was running a 185 main and a 45 pilot jet so I went to a 190/48. It still does the same thing but it doesn't seem to be as bad.
This is the air cleaner I put on it and when I noticed the problem so I went to bigger jets thinking it was running lean.
(IMG:http://s6.postimg.org/udp79t97l/image.jpg)
When I took the carb apart to check things this is what it has as a jet needle. Should I move these washers? If so which way?
(IMG:http://s6.postimg.org/up6nmkpnl/image.jpg)
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Blackcloud
post Jan 29 2016, 06:50 PM
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Watching this thread. Maybe I'll learn something.
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screwball
post Jan 29 2016, 07:45 PM
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Did it do that before the new air cleaner?? If not, put the old air cleaner back on

OR

keep screwing with the jets
learn to live with the hesitation

Good Luck
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Bamsambo
post Jan 29 2016, 08:15 PM
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I'm with Steve. If you weren't having problems before the new air cleaner then I would suspect it to be the culprit.
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Brush
post Jan 29 2016, 08:28 PM
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I wasn't able to drive the bike very much before I put the new air cleaner on so I really don't know if it was an issue before . I gave the old air cleaner to a friend who was in need so I can't put it back on . I have a 200 main jet. I guess I could put it in and see. I know there is a fix for this just got to find it..someone has the answer. The washers on the jet needle are there for some kind of adjustment I think.
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Bamsambo
post Jan 29 2016, 09:16 PM
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Is it the stock Keihin carb?
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Brush
post Jan 29 2016, 09:43 PM
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It's a CV but it wasn't stock. It had a big flow air filter, that jet needle is not stock, the hole on the slider was drilled out, and the air mixture screw plug had been removed. Someone had done some work to it for probably the same time they had added the Vance and Hines exhaust.
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Bamsambo
post Jan 30 2016, 08:46 AM
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I understand that it's a CV but who made it? What brand is it?
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Brush
post Jan 30 2016, 12:12 PM
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QUOTE(Bamsambo @ Jan 30 2016, 05:46 AM) *
I understand that it's a CV but who made it? What brand is it?


Sorry (IMG:style_emoticons/default/unsure.gif) ...it's a Keihin stock Harley carb.
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Bamsambo
post Jan 30 2016, 03:56 PM
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Sounds like whoever had it before you screwed something up. Start here >>>> Nightrider Carb Rebuild

This post has been edited by Bamsambo: Jan 30 2016, 03:57 PM
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Brush
post Feb 1 2016, 11:12 AM
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I put the ECM off of my 03 FLHT, which is a SE 7000 rpm racing module, on the deuce and it runs the same no change. So I'm not hitting my rev limiter. I think the rev limit on the deuce is around 5000 rpm. I am going to borrow a carb from a friend and see if that makes any difference. I think I'm having a issue with my pilot jet system. It runs great up to around 45/50 mph in second gear on hard throttle. Then it begins to stumble and sputter as if it is starving for fuel. If I go easy there's no problem. Only under hard acceleration. (IMG:style_emoticons/default/banghead.gif) (IMG:style_emoticons/default/banghead.gif)
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Brush
post Feb 1 2016, 11:17 AM
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Sounds like whoever had it before you screwed something up. Start here >>>> Nightrider Carb Rebuild
I looked at that before and followed their instructions

I put the ECM off of my 03 FLHT, which is a SE 7000 rpm racing module, on the deuce and it runs the same no change. So I'm not hitting my rev limiter. I think the rev limit on the deuce is around 5000 rpm. I am going to borrow a carb from a friend and see if that makes any difference. I think I'm having a issue with my pilot jet system. It runs great up to around 45/50 mph in second gear on hard throttle. Then it begins to stumble and sputter as if it is starving for fuel. If I go easy there's no problem. Only under hard acceleration. (IMG:style_emoticons/default/banghead.gif) (IMG:style_emoticons/default/banghead.gif)
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Buck
post Feb 1 2016, 11:30 AM
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QUOTE(Brush @ Jan 29 2016, 08:43 PM) *
It's a CV but it wasn't stock. It had a big flow air filter, that jet needle is not stock, the hole on the slider was drilled out, and the air mixture screw plug had been removed. Someone had done some work to it for probably the same time they had added the Vance and Hines exhaust.


Only way to tune a Harley carb is to drill out the plug in the Air Mixture screw tower. Anyone running high flow air cleaners and pipes has to do it. Sounds like to me you need to rejet. Most folks look at their spark plugs to determine whether the mixture is too rich(black,sooty,oily deposits on tip) or too lean (very white with glazed deposits on the insulator tip). Light tan or grey are normal.


Good place to learn how to basic tune a HD carb.....

Idle Mixture

Rejetting
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Brush
post Feb 1 2016, 05:35 PM
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I do appreciate all your help. I was running a 185 main and a 45 pilot jet so I went to a 190/48 no change in performance. Then I went to 200/52 and still no change. You would think with all these different jet changes there would be a noticeable change one way or the other. That's way I think something in this carb is not functioning right. I have another carb I'm going to install and see what happens..
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Brush
post Feb 1 2016, 05:52 PM
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I have a question. If you look at the picture of the needle jet I posted, aren't those washers supposed to be on the other side of the retaining clip?
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Bamsambo
post Feb 1 2016, 06:00 PM
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I had the same problem with the same stock carb for two years. It just wouldn't feed the high speed jet enough fuel. I finally got fed up and dropped $300 on a Mikuni 42mm. Best thing I ever did. Increased quicker throttle response, easier start and increase in HP.

Mikuni HSR42 EZ KIT
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Brush
post Feb 1 2016, 08:39 PM
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QUOTE(Bamsambo @ Feb 1 2016, 03:00 PM) *
I had the same problem with the same stock carb for two years. It just wouldn't feed the high speed jet enough fuel. I finally got fed up and dropped $300 on a Mikuni 42mm. Best thing I ever did. Increased quicker throttle response, easier start and increase in HP.

Mikuni HSR42 EZ KIT


A mikuni may be in my future but I think I found the problem. I didn't like how that needle jet was set up so I took it out and replaced it with a more stock one I had. Went back to a 185/48 and things are a whole lot better now. Now I think I can play with the jets and mixture screw and get it dialed in. Thanks for all your input..I will keep you posted with any changes I make. Thanks again. (IMG:style_emoticons/default/cheers.gif)
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afterburn549
post Jul 4 2016, 05:53 PM
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1st Guess- The jetting is about right---
My first thought is KISS- sounds like a fouled plug(s) Put in a fresh set, see what happens.
Next - for those of us that do not want to guess about AFR, I highly recommend an AEM gauge .
It comes with a WB sensor and it is the BEST mod I have done to my lil bike.
It gives the AFR right now so fast it is changing several times per sec.
I know, it takes the guess work out of reading plugs....but that was kind of a boorish thing to do anyway.
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