Carb Weirdness...?
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Tourer
Joined: Jan 2012
Posts: 498
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From: Hampshire, UK
Carb Weirdness...?
So my 2001 883 has stage 1 on it, Screamin Eagle II slip ons and filter so I decided o have a go at adjusting the mixture as she is running very rich.
Turns out the mixture screw is already wound all the way in?!?! Tried to wind out two turns and fuel was pissing everywhere!
No I know she really needs re-jetting (which i am getting done next week now) but this sounds weird....like the needle float fecked???
What do you dudes think?
Turns out the mixture screw is already wound all the way in?!?! Tried to wind out two turns and fuel was pissing everywhere!
No I know she really needs re-jetting (which i am getting done next week now) but this sounds weird....like the needle float fecked???
What do you dudes think?
HDF Community Team
Joined: Dec 2011
Posts: 8,620
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From: San Diego, CA
What jets are in the carburetor now? Maybe someone jetted it too rich. Also, maybe the needle has been moved in your slide, that could cause a rich mixture.
Possibly the previous owner tried to solve one of the above problems by closing off the mixture screw.
John
Possibly the previous owner tried to solve one of the above problems by closing off the mixture screw.
John
Thread Starter
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Tourer
Joined: Jan 2012
Posts: 498
Likes: 25
From: Hampshire, UK
The screw is'nt stripped I don't think, it does actually seat and not just turn....
No idea what jets are in the carb now!?
What do you mean by "the needle moved in the slide" ?
No idea what jets are in the carb now!?
What do you mean by "the needle moved in the slide" ?
Last edited by roundy; Mar 16, 2012 at 02:33 PM.
HDF Community Team
Joined: Dec 2011
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From: San Diego, CA
Roundy,
I'm thinking the needle may be down a notch or two, and the bike is running on the mainjet flow only. Lowering the "c" ring would raise the needle and expose the mainjet circuit.
That would explain the idle screw being bottomed out, your idle circuit may be circumvented by the mainjet. Your idle is only controlled by the idle speed screw now, where your throttle cables meet the carb.
I remember my old dirtbike carb worked on the slide only, and maybe whoever set up the carb figured it was like a dirtbike carb. Idle was controlled by a screw that limited how far the slide went down, not like our CV carbs.
John
I'm thinking the needle may be down a notch or two, and the bike is running on the mainjet flow only. Lowering the "c" ring would raise the needle and expose the mainjet circuit.
That would explain the idle screw being bottomed out, your idle circuit may be circumvented by the mainjet. Your idle is only controlled by the idle speed screw now, where your throttle cables meet the carb.
I remember my old dirtbike carb worked on the slide only, and maybe whoever set up the carb figured it was like a dirtbike carb. Idle was controlled by a screw that limited how far the slide went down, not like our CV carbs.
John
Last edited by John Harper; Mar 16, 2012 at 07:54 PM.
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Tourer
Joined: Jan 2012
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From: Hampshire, UK
Right, so i've stripped the carb from the bike tonight and....
The main diaphram looks good and so do other seals, although I have purchased a rebuild kit anyway. It's 10yrs old after all! I also purchased a 170 main jet to go with it as that seems to be the consensus for stage 1.
Here's the interesting part though....
A: She already has a 180 main jet in?
B: It appears someone has added some washers to the clip at the top of the needle. Isn't this what you do when you use those carbs on a bike like a Suzuki Samurai?
What is the stock positon for that clip, or the best for stage 1?
The main diaphram looks good and so do other seals, although I have purchased a rebuild kit anyway. It's 10yrs old after all! I also purchased a 170 main jet to go with it as that seems to be the consensus for stage 1.
Here's the interesting part though....
A: She already has a 180 main jet in?
B: It appears someone has added some washers to the clip at the top of the needle. Isn't this what you do when you use those carbs on a bike like a Suzuki Samurai?
What is the stock positon for that clip, or the best for stage 1?
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HDF Community Team
Joined: Dec 2011
Posts: 8,620
Likes: 4,058
From: San Diego, CA
I'm not sure of your stock setting, but it does sound like someone has moved the needle position. I'm not aware of a need to move the needle for Stage 1.
Maybe someone put in a Dynojet carb kit and messed up? You can find the dynojet instructions online, that should reference the original position of the needle (i.e which notch) in the vacuum slide. Make sure the needle is installed properly, I think a recent post mentioned getting in positioned incorrectly in the slide during rebuild.
I forget if my service manual goes into that much detail, hopefully someone else has more exact knowledge. I did my dynojet kit over 20 years ago and lost all the instructions long ago.
Sounds like you are on the right track.
John
Maybe someone put in a Dynojet carb kit and messed up? You can find the dynojet instructions online, that should reference the original position of the needle (i.e which notch) in the vacuum slide. Make sure the needle is installed properly, I think a recent post mentioned getting in positioned incorrectly in the slide during rebuild.
I forget if my service manual goes into that much detail, hopefully someone else has more exact knowledge. I did my dynojet kit over 20 years ago and lost all the instructions long ago.
Sounds like you are on the right track.
John
Thread Starter
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Tourer
Joined: Jan 2012
Posts: 498
Likes: 25
From: Hampshire, UK
Thanks John, I'll take a look to get stock settings...
How could the needle be positioned incorrectly? It just goes in a hole doesn't it??
Have been doing some Google'ing, defo seems like my needle is from a DynoJet kit, having trouble finding the instructions though...
How could the needle be positioned incorrectly? It just goes in a hole doesn't it??
Have been doing some Google'ing, defo seems like my needle is from a DynoJet kit, having trouble finding the instructions though...
Last edited by roundy; Mar 20, 2012 at 02:57 PM.