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  #1  
Old 26th January 2008
2007Low's Avatar
2007Low 2007Low is offline
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Join Date: Oct 2007
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Sportster/Buell Model: XL1200 Low/TTS/Gronked
Sportster/Buell Year: 2007
Sportster/Buell Model #2: XLCH1000
Sportster/Buell Year #2: 1975
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Default Engine Stumble On Cold Start-up

I Need Your Help To Solve This Stumbling Problem. I'd Like To Get Everyone Who Has The Same Stumbling Problem On Start-up To Log The Problem In This Thread. Then I Am Going To Take This And Other Info To The Dealer. They Need To See How Many Of Us Are Experiencing This Problem. I'm Taking My Bike To Sturgis This Summer And Am Hoping To Have This Fixed By Then.

They Want My Bike Back Again. I Wrote To Corp Harley About The Fault And They Got Back To Immediately,which Kind Of Surprised Me. The Last Time I Had The Bike To Them For This Problem, They Had Their Analyzing Equip Hooked Up To It And Even As The Problem Was Occurring Nothing Appeared To Be Out Of Wack On The Analyzer. They Told Me Then That I Would Probably Have To Wait Until It Got Worse So It Could Be Picked Up On The Analyzer.

That's When I Resorted To Sending A Two Page Letter To Corp Harley Detailing The Fault And All That Had Been Done. I Have Seen Some Posts Inquiring If Corp Harley Ever Reads These Threads. Well I Don't Imagine That They Do.

So If I Can Get A Response To This Post From All Of You That Have The Problem, I Will Make Sure That At Least My Dealer Sees Them And Corp Harley Also If Theres A Way.

They Told Me That Corp Harley Tech Services Is Going Get Involved In This Now.

I Had My Vid Cam In The Garage Yesterday When I Started The Bike And Of Course The Bike Had A Little Stage Fright And Would Not Stumble Just Idling, But When I Touched The Throttle Just A Smidge It Stumbled And When I Looked At The Recording The Light Was Just Right To Catch The Puff Of Smoke That Came From The Rear Muffler Both Times It Stumbled. So I Will Be Making More Recordings To Take To The Dealer With The Bike. Hopefully I Will Be Able To Capture On Video The Stumble Where It Just Completely Dies Just Sitting There Idling.

Thanks In Advance For Your Help.
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  #2  
Old 26th January 2008
Bob F's Avatar
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Join Date: Feb 2007
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Sportster/Buell Model: XL50 0596 Black
Sportster/Buell Year: 2007
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Mine scoot dosen't die but it will pop and miss a bit when pulling when it is cold. My scoot is a XL50 #0569.
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  #3  
Old 26th January 2008
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my bike always does the stumble you are talking about when cold. I have an 06 1200 custom.
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  #4  
Old 26th January 2008
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Default

Yep mine too it does it with the stock pipes and cycle shacks on. Just when its cold not the weather the bike. It is worse in cold weather it has quit twice on me at idle below 35 f.
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  #5  
Old 27th January 2008
2007Low's Avatar
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Join Date: Oct 2007
Location: Southwestern Minnesota
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Sportster/Buell Model: XL1200 Low/TTS/Gronked
Sportster/Buell Year: 2007
Sportster/Buell Model #2: XLCH1000
Sportster/Buell Year #2: 1975
Reputation: 23358
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Default

Quote:
Originally Posted by mray55 View Post
Yep mine too it does it with the stock pipes and cycle shacks on. Just when its cold not the weather the bike. It is worse in cold weather it has quit twice on me at idle below 35 f.
Hey thanks for responding, I'm going back to the dealer in about two weeks so I hope everyone else that has this problem will respond also. When I take the bike back to them, I hope to have a long list of respondents right here to show them how many FI Sportsters are experiencing the same fault.
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  #6  
Old 27th January 2008
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07 1200N.... Mine will have a complete miss when first started does not have to be cold outside... It might do it once, or it might hit three or four times.. After a few minutes it is fine....
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  #7  
Old 28th January 2008
CrazyDave CrazyDave is offline
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Sportster/Buell Model: 1200 Low
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07 1200L. Stalls when warming up in temps under 45
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  #8  
Old 28th January 2008
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Well I do hope you all can get harley to fix this issue, thank god I have an 02 carb bike...good luck to you all !!!
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  #9  
Old 28th January 2008
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That's just how hd has been setting the bikes up so lean to meet the ever tightening EPA standards. Its been going on for years now, starting with things like they quit putting in adjustable needles in carberators. Next they sealed up the air/fuel adjustment screw so you could no longer richen up the slow speed circuit with it. Of course there where jet kits starting to flood bike magazines so you could get the carb models tuned to a state where they did'nt stumble off idle or anywhere else. They got infamous for backfiring through the carburetor. I ran into a guy that even traded in a almost new sportster because of that factory lean tuning because he just thought it was some sort of defect, not knowing larger jets could fix it. Now '07 and up sportsters with the fuel injection are almost in the same boat as far being set up lean from the factory. The fi models are set up a little better. Their richer in the idle circuit than the carb models but their far from "just right". They too can benefit from better tuning with all the fuelers that are now flooding the market. There must be at least six or more out already, like the Dyna jet power commander, daytona twintec controler,vance&Hines fuel pak, the terry "alpha n" management system, thundermax auto-tune, and even drag specialties has one out too. Its just hd trying to keep air cooled engines around as long as possible but the epa is slowly winning the battle. H2o is getting closer! Look at it this way at least we can still retune them and then they will run smooth as ever!
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  #10  
Old 29th January 2008
2007Low's Avatar
2007Low 2007Low is offline
Senior Chief Harley Engineer 2nd Class
 
Join Date: Oct 2007
Location: Southwestern Minnesota
Posts: 1,692
Sportster/Buell Model: XL1200 Low/TTS/Gronked
Sportster/Buell Year: 2007
Sportster/Buell Model #2: XLCH1000
Sportster/Buell Year #2: 1975
Reputation: 23358
2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all2007Low is a name known to all
Default

Quote:
Originally Posted by Bill2 View Post
That's just how hd has been setting the bikes up so lean to meet the ever tightening EPA standards. Its been going on for years now, starting with things like they quit putting in adjustable needles in carberators. Next they sealed up the air/fuel adjustment screw so you could no longer richen up the slow speed circuit with it. Of course there where jet kits starting to flood bike magazines so you could get the carb models tuned to a state where they did'nt stumble off idle or anywhere else. They got infamous for backfiring through the carburetor. I ran into a guy that even traded in a almost new sportster because of that factory lean tuning because he just thought it was some sort of defect, not knowing larger jets could fix it. Now '07 and up sportsters with the fuel injection are almost in the same boat as far being set up lean from the factory. The fi models are set up a little better. Their richer in the idle circuit than the carb models but their far from "just right". They too can benefit from better tuning with all the fuelers that are now flooding the market. There must be at least six or more out already, like the Dyna jet power commander, daytona twintec controler,vance&Hines fuel pak, the terry "alpha n" management system, thundermax auto-tune, and even drag specialties has one out too. Its just hd trying to keep air cooled engines around as long as possible but the epa is slowly winning the battle. H2o is getting closer! Look at it this way at least we can still retune them and then they will run smooth as ever!
I understand what you're saying about gradually getting leaner, but I think this problem may be the opposite, at least I think mine is. It seems to be over rich during warm up, if you watch closely it is actually smoking a little black during the first couple minutes. Well anyway I'm hoping to get as many FI Sportster riders to respond if they've had these same symptoms. Thanks for your input.
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