Tryin to help a friend
Thread Starter
|
Road Captain
Joined: Dec 2005
Posts: 705
Likes: 3
From:
Tryin to help a friend
I know this topic has been beat up and down but this one is a little strange. My friend has an 05 Fatboy FI with V&H Big Radius pipes, K&N air filter and factory download. He has had it since new.It ran great with just the factory download until the last couple of months. Now he'sgotthe dreaded decel popping. We cleaned the air filter, put dry gas in, replaced plugsand checked for exhaust leaks. What else could be the problem?We know heneedsto fix this before installing any fuel management system (Sert, PCIII), as he never had this problem before. Nothing was changed. Any ideas?
Outstanding HDF Member
Joined: Jul 2007
Posts: 2,424
Likes: 0
From: Hoboken, New Jersey
RE: Tryin to help a friend
ORIGINAL: SoCal_Pappy
Check for a Vac Leak @ or around the Intake.....
Check for a Vac Leak @ or around the Intake.....
Road Warrior
Joined: Nov 2007
Posts: 1,800
Likes: 307
From: Houston, Texas
RE: Tryin to help a friend
I had an 05 Nightrain with the exact same setup. Mine developed a real bad intermitten stumble and bad decel popping. Took it toa dealer and they found a bad fuel regulator at 44,000 miles. Not sure if that's your problem but it fixed mine.
Laughed at them when they kept asking me what kind of fuel management system I was using because they couldn't find one. Said I had to have one with the stage 1 air cleaner and V&H pipes. The dealer I boughtit fromdownloaded a map direct to the stock ecm. It ran great and got 50 miles to the gallon. Saved me money as I had no plans on changing anything.
Laughed at them when they kept asking me what kind of fuel management system I was using because they couldn't find one. Said I had to have one with the stage 1 air cleaner and V&H pipes. The dealer I boughtit fromdownloaded a map direct to the stock ecm. It ran great and got 50 miles to the gallon. Saved me money as I had no plans on changing anything.
Thread Starter
|
Road Captain
Joined: Dec 2005
Posts: 705
Likes: 3
From:
RE: Tryin to help a friend
Thanks for the tips guys. I didn't think of a vacuum leak. That would be easy to check. Any ideas how I can check the fuel regulator because I took the bike out and did notice the engine miss a little?
Mannish Hawg, he never had a problem before. The factory ecm download worked great for him for three years and he wanted to fix the problem first before introducing any other variable.
Mannish Hawg, he never had a problem before. The factory ecm download worked great for him for three years and he wanted to fix the problem first before introducing any other variable.
Elite HDF Member
Joined: Feb 2006
Posts: 3,515
Likes: 6
From:
RE: Tryin to help a friend
Decel pop is caused by a lean condition created by suddenly shuting down the throttle , something has changed if it did not do it before. A lean condition can be caused by more air coming in, or more exhaust flowing out faster. Has he replaced the air filter element with another? Or it could be his exhaust has burned out some and this is the cause. Even new bikes with stock muffs decell pop if you drop the throttle quick to off, you just dont hear it thru the stock muffs.
Trending Topics
Thread Starter
|
Road Captain
Joined: Dec 2005
Posts: 705
Likes: 3
From:
RE: Tryin to help a friend
Yeah gunrunner, I was thinkin the same thing. Maybe he blew out some of his exhaust packing (if it even has any). I'm not sure if those pipes came with any packing. They are pretty loud. We could check that.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Road Master
Joined: Sep 2007
Posts: 1,019
Likes: 7
From: Chester County, PA
RE: Tryin to help a friend
ORIGINAL: Hardly Dangerous
I know this topic has been beat up and down but this one is a little strange. My friend has an 05 Fatboy FI with V&H Big Radius pipes, K&N air filter and factory download. He has had it since new.It ran great with just the factory download until the last couple of months. Now he'sgotthe dreaded decel popping. We cleaned the air filter, put dry gas in, replaced plugsand checked for exhaust leaks. What else could be the problem?We know heneedsto fix this before installing any fuel management system (Sert, PCIII), as he never had this problem before. Nothing was changed. Any ideas?
I know this topic has been beat up and down but this one is a little strange. My friend has an 05 Fatboy FI with V&H Big Radius pipes, K&N air filter and factory download. He has had it since new.It ran great with just the factory download until the last couple of months. Now he'sgotthe dreaded decel popping. We cleaned the air filter, put dry gas in, replaced plugsand checked for exhaust leaks. What else could be the problem?We know heneedsto fix this before installing any fuel management system (Sert, PCIII), as he never had this problem before. Nothing was changed. Any ideas?
1) lean running
2) air leak, likely right at the head connection
PCIII can reset if there's a power spike. Have it checked for setting/programming retention. Obviously check for leaks.
Thread
Thread Starter
Forum
Replies
Last Post