FXR Models Discuss the FXR Models in here

Issue with 89 FXRP

Thread Tools
 
Search this Thread
 
Old Nov 4, 2025 | 06:18 PM
  #1  
78Gold's Avatar
78Gold
Thread Starter
|
6th Gear
Liked
Joined: Sep 2025
Posts: 10
Likes: 16
From: Sydney
Default Issue with 89 FXRP

Hi All,
Having an issue with my 89 FXRP swingarm chop.
It was playing up a few months ago and it was the VOES hose to manifold that had come off.
I am running an Eliminator II SU Carby
The hose was refitted and all seemed fine but was getting a very occasional miss.
As this was getting worse and the plugs were showing it was running lean even with the mix screw adjusted almost fully.
Put a larger jet in and in all but the same throttle/RPM range it seems to be running better but now the miss and backfire appear worse.

My thoughts:
  1. Not a problem at Idle
  2. Not a problem when not under load (Higher RPM in neutral)
  3. Only an issue in a small rev/throttle range. ie: At 95Kph (In Top) its fine just low Rpm,
    At around 98 Kph to about 105 Rpm its terrible, missing and backfiring, after that fine again.
    I rode it over 2000 Klm's like this by watching my Rpm in each gear and it got me home fine.
  4. Not a fuel starvation issue, Petcock flows fine and no difference if cap loosened.
  5. At time it smells like its running rich to mates behind me.
  6. Running stock ignition.
I am thinking it's got to be Timing and/or VOES issues but I am no mechanic so was wondering if anyone has had similar before and what was needed to fix it.


 
Reply
Old Nov 5, 2025 | 08:58 AM
  #2  
Racepres's Avatar
Racepres
Seasoned HDF Member
Community Builder
Loved
Community Favorite
Top Answer: 1
Joined: Jul 2014
Posts: 8,590
Likes: 3,362
From: Cental, MI
Default

I doubt that it is Ignition related...But... Maybe not getting to Full Advance...Maybe..More likely Carburetion.. tho, If Drag Pipes..We have Found yer Problem!!!
 
Reply
Old Nov 9, 2025 | 02:49 AM
  #3  
78Gold's Avatar
78Gold
Thread Starter
|
6th Gear
Liked
Joined: Sep 2025
Posts: 10
Likes: 16
From: Sydney
Default Pipes

Originally Posted by Racepres
I doubt that it is Ignition related...But... Maybe not getting to Full Advance...Maybe..More likely Carburetion.. tho, If Drag Pipes..We have Found yer Problem!!!
Running cocktail shakers on stock style header (no crossover)
SU Carby and have gone up a needle/jet size as seemed to be running lean. No real change. Still playing up in same Rev range.
 
Reply
Old Nov 9, 2025 | 09:33 AM
  #4  
Racepres's Avatar
Racepres
Seasoned HDF Member
Community Builder
Loved
Community Favorite
Top Answer: 1
Joined: Jul 2014
Posts: 8,590
Likes: 3,362
From: Cental, MI
Default

I guess you need to start at Vacuum leaks..then, Maybe Ignition system...But...No Way I troubleshoot with That Carb... I do Not know enough about them, except to Avoid it For me.. I am more likely to make the Stock Ka-sneeze work properly.. But.. I never warmed up to them British carbs!! Even on My MG...
What Ignition are you Running??? Stock??
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
MarkSG
Panhead
6
May 1, 2023 08:13 AM
hd4evr2008
General Harley Davidson Chat
12
Sep 3, 2020 04:54 PM
RATROD HOG
Sportster Models
3
May 22, 2007 12:58 AM
bleeper
Exhaust System Topics
5
May 11, 2007 02:01 AM
Clove88
Exhaust System Topics
2
May 4, 2007 03:11 PM




All times are GMT -5. The time now is 05:46 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