EFI stumble
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5th Gear
Joined: Apr 2007
Posts: 9
Likes: 0
EFI stumble
Just had my heriatage(twin cam 88) dyno tuned,race tuner,screaming eagle AC,After installing Rush slip ons,with 2" baffle. Now I have a stumble when rolling into throttle hard, and on shifting.(76hp/76 torque) HD says mufflers are to blame. Anyone else experiencied this problem? If so what was the fix?
Road Warrior
Joined: Sep 2006
Posts: 1,323
Likes: 88
From: NJ
RE: EFI stumble
Have the same set up on my 07. After tune got 76hp and 87tq. Bike runs like a rice rocket 
Agree with shooter no way should you have any performance problems. Either take it back or try another tuner.
Agree with shooter no way should you have any performance problems. Either take it back or try another tuner.
5th Gear
Joined: Feb 2007
Posts: 9
Likes: 0
From: Coventry, RI
RE: EFI stumble
What year is your bike? I just had a similar experience with my 2006 fatboy, it turned out to be the fuel injectors. H.D went from an 8 degree injector to a 25 degree injector about half way through the model year. I had mine switched out. There is a TSB out about it. I believe it is 1185. I went from the 8 degree to the 25 degree, much better.
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5th Gear
Joined: Apr 2007
Posts: 9
Likes: 0
RE: EFI stumble
It's an 06 heritage,Curious,that's what RUSH mufflers also suggested,said there were problems with 06 injecters when they were doing dyno research.It's scheduled for another dyno end of month. They aslo sent me smaller baffles and torque cones to see if it makes a difference.Will call HD about any recall,Thanks.
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Joined: Feb 2007
Posts: 97
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From: SYRACUSE, NEW YORK
RE: EFI stumble
I have a Heritage 07 with the 2 in Rush Mufflers,aSERT along with the SE air intakeand it has not even been duno tuned. I have not had any problems what so ever no were. I love my bike
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Road Captain
Joined: Nov 2006
Posts: 719
Likes: 35
From: SE New Hampshire
RE: EFI stumble
SERT or PCIII, both offer user adjustability to work out minor fuel delivery issues. I have my Fatboy dialed in perfect with my PCIII, andwith only a slight amount of low speed mapping mods.
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