EVO All Evo Model Discussion

1990 FLHTC Carb problem

Thread Tools
 
Search this Thread
 
Old Jun 2, 2024 | 01:09 PM
  #1  
Don R's Avatar
Don R
Thread Starter
|
Intermediate
Veteran: Army
Joined: Jun 2020
Posts: 35
Likes: 17
From: Wilkes-Barre PA
Default 1990 FLHTC Carb problem

Folks I"m at a loss here.
My friends 90 flhtc carb is giving me a fit. It seems that the carb is slipping out of the intake.

this has been happening since his he hit a deer back in march...The bike layed down on left side...saw no damage to carb or air cleaner.

We have changed the Carb seal...was badly cracked
monday we changd the intake seals....seemed to be original to bike..were rather hard..

rode the bike all week with no problems.. then saturday we rode out and put about 100 good miles on the bike.
stopped for a bit and on restart bike would not idle again..

reset the carb back into the intake and all was good again....

can't figure out what is causing this problem
 
Reply
Old Jun 2, 2024 | 07:02 PM
  #2  
IBDAGRIZ's Avatar
IBDAGRIZ
Road Master
10 Year Member
Liked
Loved
Community Favorite
Joined: Sep 2013
Posts: 1,054
Likes: 441
From: Tejas
Default

Doesn't the air cleaner assembly bolt to the heads holding the carb in place?

Griz
 
Reply
Old Jun 2, 2024 | 07:19 PM
  #3  
Don R's Avatar
Don R
Thread Starter
|
Intermediate
Veteran: Army
Joined: Jun 2020
Posts: 35
Likes: 17
From: Wilkes-Barre PA
Default

It does...

find no damage to the mounting plate...not warped...no cracks found..alignment is good...

that is whats puzzling me

 
Reply
Old Jun 3, 2024 | 03:02 AM
  #4  
Spanners39's Avatar
Spanners39
Seasoned HDF Member
15 Year Member
Photogenic
Liked
Loved
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
Default

If it has the plastic air cleaner box with the inserted brass threads, then they come loose and this sorta thing happens.
 
Reply
Old Jun 3, 2024 | 07:20 AM
  #5  
Yankee Dog's Avatar
Yankee Dog
Grand HDF Member
Veteran: Navy
15 Year Member
Liked
Community Favorite
Joined: Apr 2007
Posts: 3,725
Likes: 3,070
From: Brighton, MI
Default

Backing plate attaches to carb with bolts, and backing plate also attaches to cylinder head by way of cylinder head mounting bolts. Like Spanners mentioned, something is amiss. There is no way it can pop off if everything is properly attached. Yes, the carb to manifold seal can get old and leak, but that seal is not designed to hold the carb on. That is the job for the air cleaner backing plate.

Can you post a pic of the setup?
 
Reply
Old Jun 5, 2024 | 12:49 PM
  #6  
Don R's Avatar
Don R
Thread Starter
|
Intermediate
Veteran: Army
Joined: Jun 2020
Posts: 35
Likes: 17
From: Wilkes-Barre PA
Default

trying to get some pics for you...anything specific you want to see
 
Reply
Old Jun 5, 2024 | 01:09 PM
  #7  
Yankee Dog's Avatar
Yankee Dog
Grand HDF Member
Veteran: Navy
15 Year Member
Liked
Community Favorite
Joined: Apr 2007
Posts: 3,725
Likes: 3,070
From: Brighton, MI
Default

pic of the carb and backing plate mounting
 
Reply
Old Jun 16, 2024 | 08:59 AM
  #8  
Don R's Avatar
Don R
Thread Starter
|
Intermediate
Veteran: Army
Joined: Jun 2020
Posts: 35
Likes: 17
From: Wilkes-Barre PA
Default

Sorry about the delay ...Things are on hold.....The bike was STOLEN from in front of his house...

If it comes back I'll get the photos


 
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
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
pacman552sd
Carburetor Related
6
Jun 3, 2015 10:39 PM
Bruno2
Dyna Glide Models
2
Mar 2, 2009 08:29 AM
timberwolfz28
Dyna Glide Models
1
Aug 3, 2008 06:46 PM
csd4682
Ironhead
5
May 13, 2008 09:38 PM
Beeracuda
Exhaust System Topics
13
Dec 27, 2005 03:16 PM




All times are GMT -5. The time now is 09:29 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