EVO All Evo Model Discussion

DTT Single fire mode not functioning

Thread Tools
 
Search this Thread
 
Old Jun 28, 2020 | 05:30 AM
  #1  
shovelhead716's Avatar
shovelhead716
Thread Starter
|
Intermediate
Joined: Sep 2008
Posts: 44
Likes: 3
Default DTT Single fire mode not functioning

Howdy,
Yesterday I took V&H pro pipe off my 1997 Fatboy and replaced with Rush dual header with crossover. After installation, bike wouldn’t start. Tried switching from single fire on my Twin Tec ignition to dual fire mode and it started right up. I never thought to disconnect battery before pipe install. Did I somehow cook module?
Any help would be greatly appreciated.
 
Reply
Old Jun 28, 2020 | 07:37 AM
  #2  
grbrown's Avatar
grbrown
Club Member
15 Year Member
Liked
Loved
Community Favorite
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Default

It is wise to disconnect the battery when doing work on our bikes, however I'm not sure swapping exhausts represents a threat! You say the engine started, but have you ridden it in the current setting?
 
Reply
Old Jun 28, 2020 | 08:28 AM
  #3  
texashillcountry's Avatar
texashillcountry
Dirt don't hurt
Veteran: Navy
15 Year Member
Top Answer: 1
Top Answer: 3
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Default

Originally Posted by shovelhead716
Howdy,
Yesterday I took V&H pro pipe off my 1997 Fatboy and replaced with Rush dual header with crossover. After installation, bike wouldn’t start. Tried switching from single fire on my Twin Tec ignition to dual fire mode and it started right up. I never thought to disconnect battery before pipe install. Did I somehow cook module?
Any help would be greatly appreciated.
If all you did was change pipes I don't see anyway that could have cooked your module.
 
Reply
Old Jun 29, 2020 | 07:43 AM
  #4  
shovelhead716's Avatar
shovelhead716
Thread Starter
|
Intermediate
Joined: Sep 2008
Posts: 44
Likes: 3
Default

Put 100 miles on her yesterday. Runs excellent on dual fire mode. But want my single fire mode.
 
Reply
Old Jun 29, 2020 | 09:16 AM
  #5  
texashillcountry's Avatar
texashillcountry
Dirt don't hurt
Veteran: Navy
15 Year Member
Top Answer: 1
Top Answer: 3
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Default

Originally Posted by shovelhead716
Put 100 miles on her yesterday. Runs excellent on dual fire mode. But want my single fire mode.
FWIW ignition problems are easier to diagnose in dual fire mode.
 
Reply
Old Jun 29, 2020 | 10:05 AM
  #6  
Beemervet's Avatar
Beemervet
Ultimate HDF Member
Veteran: Army
Joined: May 2006
Posts: 6,590
Likes: 444
From: Ohio
Default

Originally Posted by texashillcountry
FWIW ignition problems are easier to diagnose in dual fire mode.
How so?
 
Reply
Old Jun 29, 2020 | 11:26 AM
  #7  
texashillcountry's Avatar
texashillcountry
Dirt don't hurt
Veteran: Navy
15 Year Member
Top Answer: 1
Top Answer: 3
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Default

Originally Posted by Beemervet
How so?
If you have a spark problem and it changes when you switch the wires at the coil that tells you your problems are at or before the coil and if it doesn't it tells you your problems are after the coil.
 
Reply
Old Jun 29, 2020 | 01:08 PM
  #8  
Beemervet's Avatar
Beemervet
Ultimate HDF Member
Veteran: Army
Joined: May 2006
Posts: 6,590
Likes: 444
From: Ohio
Default

Thank you
 
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Jun 30, 2020 | 10:35 AM
  #9  
shovelhead716's Avatar
shovelhead716
Thread Starter
|
Intermediate
Joined: Sep 2008
Posts: 44
Likes: 3
Default

Short wire to top coil terminal? Correct?
 

Last edited by shovelhead716; Jun 30, 2020 at 10:37 AM.
Reply
Old Jun 30, 2020 | 11:31 AM
  #10  
texashillcountry's Avatar
texashillcountry
Dirt don't hurt
Veteran: Navy
15 Year Member
Top Answer: 1
Top Answer: 3
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Default

Originally Posted by shovelhead716
Short wire to top coil terminal? Correct?
With dual fire it doesn't matter with single fire you have to follow the wiring for the ignition.
The only one I'm familiar with is the 2ki and that one is rear on bottom and front on top.
 
Reply



All times are GMT -5. The time now is 08:51 PM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE