Carb jetting

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Jan 25, 2019 | 02:49 AM

05sportie

Thread Starter

Cruiser

Joined: Jan 2019

Posts: 132

Likes: 8

From: Oklahoma

Carb jetting

ok so my 05 sporty 883 has a cough and I know it needs rejected. It’s all stock except the cone air filter and the screaming eagle 2 exhaust without baffles. Does anybody know a good starting point on my jetting and settings. Thanks for the help. I tried searching but didn’t find the answer I was needing.

Jan 25, 2019 | 05:41 AM

grbrown

Club Member

Joined: Jun 2007

Posts: 45,429

Likes: 2,898

From: Bedford UK

You have two options IMHO. Any suggestions we make may get you closer to running good, but are not guaranteed to achieve that, so you could learn how to tune your carb yourself. Alternatively seek out a local indy who can probably get things just right for you in a darned sight less time. I learned that decades ago!

Jan 25, 2019 | 08:09 AM

hscic

Grand HDF Member

Joined: Dec 2014

Posts: 4,890

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From: USA

Not going to make any recommendations on jetting as there are too many variables besides mods. Not every bike is the same. As grbrown suggested, play around with the jetting yourself depending on the symptoms, you can determine if your focus should be on main or intermediate jetting adjustments. If your cough happens at high rpm, play with your main jetting. If at low to mid rpm, play with your intermediate jettting.

Here is a good video IMO that may help you with jetting....may not be the same carb or bike but the application is the same. What is helpful in this vid is they show what happens (symptoms) when the bike is running too lean or too rich for both the main and intermediate jetting.

Don't forget to reset your idle mixture, idle speed, and accelerator pump too. There are vids on how to do this.

Have fun with it.....if you learn how to tune, you will have an easier time troubleshooting.

Last edited by hscic; Jan 25, 2019 at 08:47 AM.

Jan 25, 2019 | 08:41 AM

60Gunner

Grand HDF Member

Joined: Sep 2017

Posts: 4,359

Likes: 1,219

From: Dubuque, IA

The main is rich from the factory. It's the slow and needle that are lean from the factory. A good starting point would be a 45 slow most likely. I'm running an N65C needle shimmed .040 and actually dropped to a 170 main with it on a 1200. I'll have to start over tweaking the carb and timing now tho since I just put the jackhammer 570 cams in.
But you really should start at the beginning because as was said, a lot of variables. An excellent write up on doing this at the sportster only forum in our one of a kind sportsterpedia database.

Last edited by 60Gunner; Jan 25, 2019 at 08:44 AM.

Jan 25, 2019 | 12:23 PM

John Harper

HDF Community Team

Joined: Dec 2011

Posts: 8,587

Likes: 4,019

From: San Diego, CA

Most of us seem to end up with a 45 pilot jet. Some or all of your problem could simply be adjusting your idle mixture screw. 2 1/2 turns out seems a good starting point for the mix screw, then you can fine tune from there.

John

Last edited by John Harper; Jan 25, 2019 at 12:24 PM.

Jan 25, 2019 | 06:02 PM

05sportie

Thread Starter

Cruiser

Joined: Jan 2019

Posts: 132

Likes: 8

From: Oklahoma

Awesome thank you guys so much for the info, this helps me a lot and get me in the right direction

Feb 25, 2019 | 02:43 PM

Kaljammer

Stage I

Joined: Feb 2019

Posts: 1

Likes: 0

From: Minnesota

883 1200 conversion carb jets

hi, I’ve got a 1999 883 that I did a 1200 conversion on myself. Trying to finish up but the 175 jet that I got does not fit! I got the 45 jet installed though. It currently has a 170 jet. I live in Minnesota. Do you think with a little tuning it would rock? Or should I get a new main jet fitting that will fit the 175? I have straight pipes screaming eagle and a performance air intake too, programmable ignition module too.