Engine Mechanical Topics Discussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.

Unknown Issue

Thread Tools
 
Search this Thread
 
Old Dec 4, 2019 | 01:34 PM
  #1  
Pearlsnapz's Avatar
Pearlsnapz
Thread Starter
|
Stage III
Joined: Aug 2019
Posts: 3
Likes: 0
From: TX
Default Unknown Issue

Hi All,

I am at a loss with that's wrong with my bike. 08 Ultra Classic.... When I bought the bike everything was fine, I removed the baffles from the stock pipes and everything was still running good, less fuel mileage but running decent. There was an constant flame coming from the exhaust and burning the pipe, and horrible backfire. So I bought a fuelpak 3 to hopefully correct it. That's when everything went down hill, the flame didn't stop, still backfiring like crazy regardless of what time Vance and Hines sent me... I went ahead and bought a pair of megaphone slip ons and tuned again. Backfiring and flame has stopped but I have basically lost all power in 6th gear. I can run it up to 90 95 in 5th an the moment shift to 6th, I slow down, throttle wide open.

I checked timing and everything I can think of, I'm low on funds so taking it to the dealership is not an option... My next route to check would be the valves. However, is there something else I could be missing? Is there a way to check which cylinder might be messing up? Maybe burnt a valve? Is there a way to narrow down which cylinder might have the burnt valve without taking the motor apart. I can get the valves done if that's what's needed but I can't go replacing parts that are fine, which I'll have to do if I just guess and it's the wrong cylinder.

Thanks in advance.
 
Reply
Old Dec 4, 2019 | 10:36 PM
  #2  
Max Headflow's Avatar
Max Headflow
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,962
Likes: 8,056
From: poway
Default

I know what the issue is.. You messed with the bike.
 
Reply
Old Dec 4, 2019 | 10:45 PM
  #3  
50pannmore's Avatar
50pannmore
Cruiser
Joined: Mar 2018
Posts: 197
Likes: 46
From: Rubidoux ca
Default

Put the restrictive exhaust back on and Flash the stock map back into your bike with your fp3 and see if that clears it up I seriously doubt you have a burnt valve or anything else wrong with it other than and I hate to say it probably the fp3 I have a fP3 on my 15 Road Glide with thunderheader slip ons and it started running like s*** so I ran Auto-Tune and then reflashed it and set my throttle Progressive tivity back to moderate and it started running a lot better our local dyno tuner has a box of old fp3
 
Reply
Old Dec 5, 2019 | 06:56 AM
  #4  
marcodarq's Avatar
marcodarq
Grand HDF Member
10 Year Member
Liked
Loved
Top Answer: 1
Joined: May 2014
Posts: 3,856
Likes: 1,184
From: florida
Default

Have you checked your fuel pressure?
m
 
Reply
Old Dec 5, 2019 | 10:19 AM
  #5  
V&HBryan's Avatar
V&HBryan
Banned
Joined: Sep 2019
Posts: 241
Likes: 137
From: Los Angeles
Default

Originally Posted by Pearlsnapz
Hi All,

I am at a loss with that's wrong with my bike. 08 Ultra Classic.... When I bought the bike everything was fine, I removed the baffles from the stock pipes and everything was still running good, less fuel mileage but running decent. There was an constant flame coming from the exhaust and burning the pipe, and horrible backfire. So I bought a fuelpak 3 to hopefully correct it. That's when everything went down hill, the flame didn't stop, still backfiring like crazy regardless of what time Vance and Hines sent me... I went ahead and bought a pair of megaphone slip ons and tuned again. Backfiring and flame has stopped but I have basically lost all power in 6th gear. I can run it up to 90 95 in 5th an the moment shift to 6th, I slow down, throttle wide open.

I checked timing and everything I can think of, I'm low on funds so taking it to the dealership is not an option... My next route to check would be the valves. However, is there something else I could be missing? Is there a way to check which cylinder might be messing up? Maybe burnt a valve? Is there a way to narrow down which cylinder might have the burnt valve without taking the motor apart. I can get the valves done if that's what's needed but I can't go replacing parts that are fine, which I'll have to do if I just guess and it's the wrong cylinder.

Thanks in advance.
Sounds like you may have an issue other than tuning, but at least I can help you cross something off your list.

Navigate to the Customer Support Menu, select Vance and Hines Support, then scroll down and press Upload ECU Content. From there send me an email at FPPro@VanceandHines.com with the details of the parts installed on your bike, and the last 6 of your VIN, and I'll look into your tune personally.
 
Reply
Old Dec 5, 2019 | 02:41 PM
  #6  
Pearlsnapz's Avatar
Pearlsnapz
Thread Starter
|
Stage III
Joined: Aug 2019
Posts: 3
Likes: 0
From: TX
Default

Originally Posted by V&HBryan
Sounds like you may have an issue other than tuning, but at least I can help you cross something off your list.

Navigate to the Customer Support Menu, select Vance and Hines Support, then scroll down and press Upload ECU Content. From there send me an email at FPPro@VanceandHines.com with the details of the parts installed on your bike, and the last 6 of your VIN, and I'll look into your tune personally.
Thank you. I've tried doing this before and nothing seemed to change when this came back.. I will do this after work.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
wengerda
Tri Glide, RG3 & Freewheeler Models
6
Oct 2, 2018 01:27 PM
RustyCage
Dyna Glide Models
5
Aug 7, 2014 04:10 PM
Chris07
Ignition/Tuner/ECM/Fuel Injection
1
Oct 11, 2013 11:59 AM
FASTTED
Exhaust System Topics
3
May 19, 2012 05:52 AM
NCtaxguy
Touring Models
6
Apr 10, 2010 11:52 AM




All times are GMT -5. The time now is 09:23 PM.

story-0
Jason Momoa Is Turning Classic Harleys Into PHEVs

Slideshow: Jason Momoa's latest restoration project blends 1920s Harley-Davidsons with modern electric technology, creating some of the most unusual hybrid motorcycles ever built.

By Verdad Gallardo | 2026-06-10 17:18:58


VIEW MORE
story-1
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom

Slideshow: Killer Custom's latest build relies on styling changes rather than performance upgrades, giving the cruiser an entirely different personality.

By Verdad Gallardo | 2026-06-03 18:28:05


VIEW MORE
story-2
6 Weirdest Harley-Davidsons Ever Sold to the Public

Slideshow: From military-inspired singles to scooters and three-wheel utility vehicles, these Harleys took the company far outside its comfort zone.

By Verdad Gallardo | 2026-06-02 18:34:10


VIEW MORE
story-3
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-4
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-5
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-6
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-7
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-8
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-9
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