Back fire

Closed Thread Subscribe

Thread Tools

Search this Thread

Mar 3, 2009 | 11:05 AM

200488inch

Thread Starter

Novice

Joined: Mar 2009

Posts: 19

Likes: 0

From: Pottstown, PA

Back fire

I went riding this weekend for a decent ride and starting getting back fire when I was on the highway. Any idea on whats causing it and how I might fix it?

Mar 3, 2009 | 11:53 AM

the blob

Road Warrior

Joined: Sep 2006

Posts: 1,570

Likes: 45

check the header bolts mine were less than finger tight!! i think some how mine worked loose.

Mar 3, 2009 | 12:03 PM

LilBudyWizer

Road Warrior

Joined: Mar 2008

Posts: 1,691

Likes: 3

Also check your spark plugs.

Mar 3, 2009 | 12:04 PM

honestbob

Elite HDF Member

Joined: Apr 2008

Posts: 3,900

Likes: 4

From: way down upon the Suwannee River

What year, model, milage, and mods? Does it do it while decelerating or accelerating, High rpm or low, Hot or cold? You need to put out a little more info to get a decent answer.

Mar 3, 2009 | 12:47 PM

Da Gumpmeister

Ultimate HDF Member

Joined: Dec 2007

Posts: 8,642

Likes: 6

From: Forest Lake, Mn

Quote:

Originally Posted by honestbob

What year, model, milage, and mods? Does it do it while decelerating or accelerating, High rpm or low, Hot or cold? You need to put out a little more info to get a decent answer.

Thank You, Bob.
+1

Mar 3, 2009 | 12:49 PM

txfxstrider

Ultimate HDF Member

Joined: Apr 2006

Posts: 6,913

Likes: 87

From:

Also need to know if it is backfiring through the exhaust or carb.

Mar 3, 2009 | 12:50 PM

oldairboater

Ultimate HDF Member

Joined: Jan 2008

Posts: 7,476

Likes: 5

From: Republic of Texas

+1 Is this bike just out of storage? Old gas? From what you posted I can narrow it down for you. Something is wrong with either fuel mixture, or ignition, or timing, or compression. To get a better answer more information is needed.

Quote:

Originally Posted by honestbob

What year, model, milage, and mods? Does it do it while decelerating or accelerating, High rpm or low, Hot or cold? You need to put out a little more info to get a decent answer.

7 Surprising Harley-Davidson Products that Are Not Motorcycles

Verdad Gallardo

8 Best Harley-Davidson Motorcycles Ever

Pouria Savadkouei

10 Worst Harley-Davidson Motorcycles Ever

Pouria Savadkouei

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

Verdad Gallardo

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

Verdad Gallardo

Harley-Davidson Reveals Super Cool Cafe Racer Concept

Verdad Gallardo

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Verdad Gallardo

10 Motorcycles You Should Never Buy

Joe Kucinski

10 Things Harley-Davidson Needs to Fix in 2026

Verdad Gallardo

Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

Verdad Gallardo

Mar 4, 2009 | 07:33 AM

200488inch

Thread Starter

Novice

Joined: Mar 2009

Posts: 19

Likes: 0

From: Pottstown, PA

Its a 2004 Night Train FXSTBI. Its the fuel injected model. I bought the bike from a dealership and it was sitting since last riding season. I recently filled the tank with new gas. The only mod is the exhaust. I beleive the back fire is coming from the pipes. It started back firing when I would ease off the throttle at higher RPM or when I down shifted coming off an exit.

Mar 4, 2009 | 07:46 AM

#10

SteelCityScooter

Road Master

Joined: Sep 2006

Posts: 991

Likes: 0

From:

Quote:

Originally Posted by 200488inch

The only mod is the exhaust. I believe the back fire is coming from the pipes. It started back firing when I would ease off the throttle at higher RPM or when I down shifted coming off an exit.

Sounds like you are "sucking air". So check the head bolts, and around the junction of the slipons to the exhaust pipe. Its called "deceleration popping"