Harley Davidson Forums

Panhead A place to talk about Panhead motors.

high speed backfire

Thread Tools
 
Search this Thread
 
Old Oct 31, 2010 | 09:20 PM
Share
  #1  
g becker's Avatar
g becker
Thread Starter
|
2nd Gear
Joined: Oct 2010
Posts: 6
Likes: 0
Default high speed backfire
need help 49 in a50 frame 4th gear when I get to a steady speed starts backfiring.
 
Reply
0
Old Nov 1, 2010 | 09:34 AM
Share
  #2  
sqdealgeorge's Avatar
sqdealgeorge
Road Warrior
Joined: Dec 2007
Posts: 1,854
Likes: 20
From: Eagle River WI
Default
What carb ? Water in the float?
 
Reply
0
Old Nov 1, 2010 | 08:09 PM
Share
  #3  
g becker's Avatar
g becker
Thread Starter
|
2nd Gear
Joined: Oct 2010
Posts: 6
Likes: 0
Default
new bendix new plugs set@.018 new points at.022 new plug wires and new coil,float is at a heavy 1/4",ajustable main jet.
 
Reply
0
Old Nov 2, 2010 | 07:03 AM
Share
  #4  
Ultra 08's Avatar
Ultra 08
Elite HDF Member
Joined: Jul 2008
Posts: 4,270
Likes: 1
From: Central Virginia
Default
Did it backfire before you put the new stuff on or just start afterwards?
 
Reply
0
Old Nov 2, 2010 | 09:35 AM
Share
  #5  
scottfisher's Avatar
scottfisher
Road Captain
Joined: Oct 2010
Posts: 566
Likes: 3
From: rural ontario
Default
Sounds like some minor tuning to me. Check your timing, check for intake leaks, check the colour of your plugs (white, tan, or dark) and make adjustments accordingly
 
Reply
0
Old Nov 2, 2010 | 12:50 PM
Share
  #6  
48pan's Avatar
48pan
Tourer
Joined: Mar 2009
Posts: 260
Likes: 3
From: Fort Worth, Texas
Default
Plugs should be set at .025 to .030. Backfiring through the exhaust or intake?
 
Reply
0
Old Nov 2, 2010 | 07:25 PM
Share
  #7  
g becker's Avatar
g becker
Thread Starter
|
2nd Gear
Joined: Oct 2010
Posts: 6
Likes: 0
Default
It would hardly run before ,backfiring through the carb, plugs soot up . I have the idle jet at 1.5 turns out main at 4.
 
Reply
0

Trending Topics

Old Nov 2, 2010 | 07:48 PM
Share
  #8  
PakMul's Avatar
PakMul
Cruiser
Joined: Sep 2010
Posts: 178
Likes: 0
From: Albany, Oregon
Default
Sounds awful rich if the plugs are sooting up....
 
Reply
0
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 Nov 2, 2010 | 08:24 PM
Share
  #9  
g becker's Avatar
g becker
Thread Starter
|
2nd Gear
Joined: Oct 2010
Posts: 6
Likes: 0
Default
think I found an intake leak ,how hard is that to fix ?
 
Reply
0
Old Nov 3, 2010 | 10:05 AM
Share
  #10  
sqdealgeorge's Avatar
sqdealgeorge
Road Warrior
Joined: Dec 2007
Posts: 1,854
Likes: 20
From: Eagle River WI
Default
Are you still running the brass seals or are you updated to rubber orings ? If brass I would use hi temp silicone
 
Reply
0



Advanced Search
Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 11:07 AM.

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