Sportster Rejet questions.

[Hammer107]

Guys,

Attempted to rejet my wife's 2005 883 Sportster this weekend to cure a carb sneeze and we previously installed pipes and a Big Sucker.

I had a lot of problems initially...so I removed all Dyno Jet stuff and returned the carb to stock parts...stock needle, spring etc. I did leave the 175 jet in it and the fuel mix screw is set at 2 1/2 turns out.

Bike will start and idle like a champ...runs great.

Any throttle at all or any load and it wants to puke, sputter, pop and generally run like hell.

I have inspected the diaphragm pretty thoroughly and find no rips or tears and I am pretty sure that it is seated correctly....you can feel it when you put the cap on.....by feel it I mean you can feel where it seats down in what I suspect to be correctly.

I have sprayed WD-40 around intake and carb joints with no change in rpm. To be honest the bike was not completely warmed up however it was able to idle with the choke all the way in so I figured it should be good to test.



Here are some key points...the bike WILL run ok with the choke out.

I only see two vacuum lines coming off the carb...one goes to the petcock and the other comes off the fuel bowl and goes down into the sidecover.....that line is NOT connected to anything. Is their only two lines? Have I maybe missed one somewhere?

Here are my questions.

1. Should that bowl vacuum line connect to something and if so what?

2. The bike running with the choke out points to vacuum leak...but I find none. Can you test the diaphragm to see if it is leaking? Should the slide be moving at all at idle? I suspect no as their is no load.

3. I have read about a VOES switch however I see no vacuum port from the carb to any kind of switch....where would I see this or know if her bike is equipped with one of these?


Any and all help is appreciated. Thanks.

[Flyer]

1. No. It's not a vacuum line. It's for overflow.
2. You have no vacuum leak.
3. VOES is for Cal. models only
What you do have (if I understand your post correctly) is a DJ (DynoJet) main jet and emulsion tube being managed by a stock needle and spring.
Is that the case?

[Hammer107]

No. I removed the DJ emulsion tube and replaced it with the OEM tube.

I currently have all stock parts back in the carb with maybe the exception of the spring. I might have mixed the two up.

I don't think just the spring would give me as severe symptoms as I have but I could be wrong.

I did drill the vacuum hole on the slide to 1/8 inch which I cannot undo.

[Mtclassic]

You can tell the diff. in the springs as the dj spring is shorter. YOu can use jb weld to plug the hole and redrill. Soldier works too. make sure the needle (goes on top of the emulsifier tube) is not put in upside down. That will cause the symptoms you describe.

[Hammer107]

The needle on top of the emulsifier tube only seemed to fit one way.

If I put it with the long end up it would not seat far enough in to screw the emulsifier tube in.....Is that normal or did I just not work it the other way enough?

When I took it apart it dropped out before I noticed which end was up.....which end is supposed to go up?

[Mtclassic]

long end goes up. Now go give a homeless person a dollar.

[Flyer]

Needle can only sit inside vacuum piston one way.
Emulsion tube threads into carb main body one way.
Main jet threads into emulsion tube one way.
Am I missing something here?
Check to see if needle keeper (plastic doohicky sitting on top of needle head inside slide) is oriented the right way. Via spring pressure, it keeps needle firmly planted on slide.

[Mtclassic]

Originally Posted by Flyer

Needle can only sit inside vacuum piston one way.
Emulsion tube threads into carb main body one way.
Main jet threads into emulsion tube one way.
Am I missing something here?
Check to see if needle keeper (plastic doohicky sitting on top of needle head inside slide) is oriented the right way. Via spring pressure, it keeps needle firmly planted on slide.

needle jet and needle are two diff. things. the needle jet sets on top of the emulisifier tube. You don't see it unless it falls out.

[Hammer107]

I will go check this again...because I think mine is short end up.

I tried long end up I think (I've tried about every combination) and the needle jet wouldn't go in far enough to thread the emulsion tube into the carb.

[Flyer]

"The needle on top of the emulsifier tube only seemed to fit one way."

So, he's talking about the needle jet! What a difference a three letter word can make. Actually you can see it, from the throat side of the carb.

...ok, looking for a dollar!

[Hammer107]

You could see it from the throat before too.

It still would only go in short end up....so I fiddled and fiddled and fiddled and all of a sudden pop...up it goes.

Long end up....bike is back to at least running although it will occasionally sneeze through the carb still...which was the original issue I wanted to fix.

Any thoughts here...I am going to go put the Dyno Jet parts back into the bike...so maybe that will cure it.

What actually causes the carb to sneeze...I am assuming it is transitioning from one idle circuit to a cruise circuit based on where it is.....but any input would be great.

I love this site...if I need to know whether to wave or not I can go to some of the other sites but this one rules!

Thanks guys for your help.

[Bubba Neil]

My wifes 05 883 has the same issue, have made it better by going farther out on the fuel mix screw.... you said you have it out 2 1/2 turns.
I have a Ness B/S on it along with the 50 state SE slip-ons.
Also have heard about shimming the needle upward helps too.
Try this site for some more info http://xlforum.net/vbportal/forums/f...splay.php?f=34

[Flyer]

If you're sneezing while on steady cruise throttle it's the needle and needle jet you're on, and it's running lean. Shim the needle.
Sneezing at idle, use your mixture screw to correct.

[Hammer107]

It will sneeze at very slight part throttle. It doesn't do it often but it freaks her out and she's convinced it will stall and she will explode into a fiery hunk of steel.

So I want to fix it....so she'll leave me alone.

I will fiddle with the settings and see...If you shim the needle which way goes richer and which way goes leaner?

I would assume moving the little "e" clip up the notches say from the 4th to the 3rd notch from the top of the needle would seat the needle deeper into the needle jet and would lean it out.

Am I right?

It may not even be an issue once I get the DJ stuff back in......I want to ride but I don't want to leave her home pouting.

[Hammer107]

Initial test ride done...no sneeze...starts much better and seems to run much better as well.

Thanks again guys for the help.