Go Back   Harley Davidson Forums > Harley Davidson Motorcycles > Sportster Models
Sign in using an external account
Register Forgot Password?
Search


Sportster Models 883, 883 Custom, 1200 Custom, 883L, 1200L, 1200S, 1200 Roadster, XR1200, and the Nightster.
Sponsored by: Rush Racing Products

Reply
 
 
 
P
 
Thread Tools Search this Thread
  #1  
Old 03-27-2010, 06:53 PM
matt_883 matt_883 is offline
Hang Around
Join Date: Sep 2009
Posts: 73
Default cause of carb hesitation, sputter fart?

Background info...2006 883, mostly stock. Last weekend I put on Vance & Hines shortshots, SE stage 1 intake that uses stock ham can and cleaned and re-jetted the carb with 44 pilot jet and 175 main jet and set also set mix screw to 2.5 turns out. The temps last weekend were mid 70's and the bike ran flawless all weekend! Not the slightest sign of a carb fart or any hesitation in any gear.

Fast forward to this weekend with the temps in the mid 50's. I took the bike out for a ride and did my usual ride the first few miles with choke out and gradually pushed it all the way in when it was warmed up. As soon as the choke was pushed all the way in the bike would hesitate, sputter and carb fart at about a steady 1/8-1/4 pretty regularly? What gives? Why would it all of a sudden start doing this after it ran perfectly last weekend? Should I up the pilot jet to a 45 or is does my bike really dislike the cokd weather that much? FYI the hesitation/sputter carb farts are worse in 2nd, 3rd and sometimes 4th gear and like I said at about 1/8-1/4 steady throttle or on a slight uphill. Thanks in advance and sorry for the long post.

Matt
Reply With Quote
  #2  
Old 03-27-2010, 07:26 PM
kevmic28's Avatar
kevmic28 kevmic28 is offline
Road Warrior
Join Date: Sep 2009
Location: Fort Worth, Texas
Posts: 1,411
Send a message via Yahoo to kevmic28
Default

Cold weather does crazy things to our bikes. You rejetted it and adjusted the A/F when it was 20 degrees hotter. When it gets hotter you will have to adjust the A/F again. Its a never ending battle. Thats why the call it a love hate relationship with a Harley.. lol
__________________
"You all can go to Hell Im going to Texas"
1985 KDX200 for sale
1995 kx 100
1970 GMC truck restoration in progress for sale
1988 Harley 1200 Sportster
http://www.facebook.com/home.php?ref...in?ref=profile
Reply With Quote
  #3  
Old 03-27-2010, 07:41 PM
Hitechluddite's Avatar
Hitechluddite Hitechluddite is offline
Road Warrior
Join Date: May 2008
Location: Indianapolis
Posts: 1,556
Default

Did you take the rubber diaphram out of the top when you did the carb or did you do everthing with just the floatbowloff? Those rubber diaphrams are a bear to get seated right and if they aren't after a while a little pinch will become a tear or hole...

The pilot can make a difference. CV performeance makes a EZ adjustable Pilot screw kit that will allow you to fairly easily optimize your pilot while the bike is running.
__________________
Any wimp can put 100k on a Ultra, it takes a real man to put 100k on a 883 Sportster!

Politically incorrect Since 1981!
Reply With Quote
  #4  
Old 03-27-2010, 07:56 PM
BLKBAGGER's Avatar
BLKBAGGER BLKBAGGER is offline
Outstanding HDF Member
Join Date: Oct 2007
Location: El Cajon Ca.
Posts: 3,451
Default

I would take it up to a 45 slow jet.
__________________
Reply With Quote
  #5  
Old 03-28-2010, 07:30 AM
murphy08's Avatar
murphy08 murphy08 is offline
Hang Around
Join Date: Jul 2008
Location: saco maine
Posts: 72
Default

+1 on the 45 I just did my on sat it was 20-30 out side and left the 175 main and change 44 to a 45 and the plugs and i'm 2 turns out no carb farts ect
__________________
mods- 3 and a half inc rise 32inc drag bar cycleshack turn out stage 1 se/ac highway peg kit


A wise man once said there no such thing as bad weather for riding it's the poor judgement in clothing
Reply With Quote
  #6  
Old 03-28-2010, 11:19 AM
WRAITH's Avatar
WRAITH WRAITH is offline
Road Warrior
Join Date: Sep 2006
Location: Mission,BC.Canada
Posts: 1,278
Default

Check your spark plugs. What color are they. You may have fouled them. With stage 1 jetting you shouldn't need the choke on for more than 30-60 seconds.
__________________
2006 XL1200c. Stage 1, Chain drive(say no to rubber bands). I am a Rider, not just an owner.
Reply With Quote
  #7  
Old 03-28-2010, 12:42 PM
ranger007's Avatar
ranger007 ranger007 is offline
Hang Around
Join Date: Jan 2010
Posts: 20
Default

I had the same problem with my carb when I re-jetted. Check the idle jet and main jet for obstructions. It seems stupid but it can cause this problem... It did it to me..
Reply With Quote
  #8  
Old 03-28-2010, 04:08 PM
matt_883 matt_883 is offline
Hang Around
Join Date: Sep 2009
Posts: 73
Default

I did not touch the top of the carb when I re-jetted it for fear of said diaphram issues.

I do plan on this week changing the plugs (and checking the color or the existing ones) and changine the oil as well as putting in a 45 pilot jet this week. I'll also check for obstructions in the jets but I highly doubt it since they are brand new and I usually run an ounce or so of PJ1 carb cleaner with every other tank of gas.

If the plugs are in fact fouled then why would my bike run like a scalded dog under hard accelerations then? It really ones stutters and hesitates under light load with the throttle and runs like a bat outta heck when I hit the throttle (it definitely seems like its searching hard for either more air or gas or both).

Thanks for suggestions and I'll report back with findings.

-Matt
__________________
2006 XL883 - V&H Shortshots: SE intake: 45 slow jet, 175 big jet: Custom 6" extended forwards: Sundowner
Reply With Quote
  #9  
Old 04-08-2010, 09:10 PM
Strick's Avatar
Strick Strick is offline
Prospect
Join Date: Sep 2008
Location: Reno NV
Posts: 113
Default

Cold weather = richer jetting. I would go to a 45 (period). Then for the sake of seasonal adjustment, buy an external mixture screw (the one with a big ****). This will allow you to adjust up to one pilot size in a matter of seconds. Easy stuff!


Oh, and I live at altitude 4500', which means I can run leaner jetting than most. I also have a 180 main with drilled out stock exhaust (differusers removed) and open air box (4 add'l - 1" holes drilled) with K&N filter on my wife's bike. My wife's 883 RUNS!!
Good Luck!
__________________
Strick
'10 FLHX, '04 VRSCB, '06 XL1200L(wife's), '07CRF150R(wife's) '04CRF450, '78-SR500 (streettracker), '67 Camaro 'vert (505hp/510tq)

Last edited by Strick; 04-08-2010 at 09:15 PM..
Reply With Quote
  #10  
Old 04-08-2010, 09:22 PM
matt_883 matt_883 is offline
Hang Around
Join Date: Sep 2009
Posts: 73
Default

Great news! I did change the pilot jet to the 45 like you all suggested. I also put the mix screw to 2.25 turns out and it has fixed 99% of my carb farts hesitations so far. My only concern is that I have only run the bike this way in temps that have been in the 70's-90's. Before when it was hesitating and sputtering, the temps were in the low to mid 60's. I am going to contribute the sputtering and carb farts before to the 44 pilot jet for now until I can run it in its current 45 pilot jet state in some cooler temps. I'll keep everyone posted.

P.S. My new-to-me bike (2006 XL883 has approx. 8,000 miles on it as of last week. I have put about 1,000 miles on it since I got it in February. It was mostly stock when I got it. After about a month of riding (before I did my re-jet, pipes and AC) it started running terribly. It would idle ok but would hesitate majorly around 2-3K rpm. It would run ok when I really got on the throttle. I checked the codes and it really didnt show anything major. After experiencing the same major hesitating problems coming off idle after re-jetting with the pipes and AC, I replaced the crank position sensor on the front of the engine and this fixed the problem perfectly and it has run like a scalded dog since. Moral of the story if you think you are having a carb/fuel issue and are dealing with some stumbling and hesitating off idle you may have a bad sensor. It is worth checking rather than pulling your hair out adjusting the carb. The sensor was only $50 at the stealer and if it is not the cause of your problem, throw it in the tool box for when it does go bad later.

-Matt
__________________
2006 XL883 - V&H Shortshots: SE intake: 45 slow jet, 175 big jet: Custom 6" extended forwards: Sundowner
Reply With Quote
Old 04-08-2010, 09:22 PM
 
 
 
P
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
What jet sizes would you recommend? matt_883 Sportster Models 10 07-09-2014 01:00 PM
Slow jet is too small? jokenroll Evo Classic Models 41 06-25-2012 11:24 AM
01 883 carb farts madmike1735 Sportster Models 2 09-19-2011 06:39 PM
Carb jetting and Stage 1 kit The Jerk Dyna Glide Models 1 04-04-2011 10:52 AM
Ist long ride since stage 1 davidc Sportster Models 11 03-28-2007 07:43 PM


Tags
2000, carb, carbureted, davidson, davidsoncarb, fart, forums, gear, harley, hesitates, load, sportster, sputter, sputtering, stutters


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join HDForums

Advertising
Featured Sponsors
Vendor Directory
Sponsors

All times are GMT -5. The time now is 07:50 AM.


Internet Brands, Inc.