Backfire
Thread Starter
|
Road Captain
Joined: Jun 2010
Posts: 711
Likes: 0
From: Eastern Shore, MD
Backfire
Since i had the 1000 mile service done, i've noticed a backfire that sounds like its coming from the air cleaner/carb, right when i rev the engine before engaging the clutch to pull out in first gear from a stop. Doesn't do it every time. Maybe 50% of the time. Any ideas ?
Road Warrior
Joined: May 2008
Posts: 1,718
Likes: 1
From: manhattan beach
does the bike seem to have more power than before you took it in?
my first guess is also the rich/lean issue- and as above, you can tell if its too rich by pulling a plug and looking at it.
if it is too rich, it should be pulling stronger than before. the factory sets the bikes a bit too lean for fuel economy. it is possible that they adjusted this.
my first guess is also the rich/lean issue- and as above, you can tell if its too rich by pulling a plug and looking at it.
if it is too rich, it should be pulling stronger than before. the factory sets the bikes a bit too lean for fuel economy. it is possible that they adjusted this.
Thread Starter
|
Road Captain
Joined: Jun 2010
Posts: 711
Likes: 0
From: Eastern Shore, MD
Seems to have the same amount of power.
I ask them about it today. They said they did no adjustment. They just pulled the plugs and put them back. It was also a quart low on oil when i got it back.
The mechanic admitted to checking the oil with the bike standing straight up and not leaning on the jiffy stand like he should have. They say they test drove it 8 miles after the service and found no problems.
I'll look at the plugs in the morning. Too dang hot out right now.
I ask them about it today. They said they did no adjustment. They just pulled the plugs and put them back. It was also a quart low on oil when i got it back.
The mechanic admitted to checking the oil with the bike standing straight up and not leaning on the jiffy stand like he should have. They say they test drove it 8 miles after the service and found no problems.
I'll look at the plugs in the morning. Too dang hot out right now.
Last edited by Cazimere; Jul 23, 2010 at 04:07 PM.
Road Master
Joined: May 2009
Posts: 1,180
Likes: 3
From: utah
Yeah, that's kinda wierd that they didn't do any tune adjustment and it's backfiring. Man, you have an 06 with only 1000 miles on it!
I wouldn't think the oil level would have a lot to do with the backfiring. +1 one on seeing what the plugs look like. Did they change the plugs or just put the same ones back in?
I guess you could also see if there's any type of leak on the exhaust gaskets. Usually they will warranty their service for a month or so as well; you might be able to bring it back in and have them try to figure it out. Did you have it done at the stealer?
Good luck!
I wouldn't think the oil level would have a lot to do with the backfiring. +1 one on seeing what the plugs look like. Did they change the plugs or just put the same ones back in?
I guess you could also see if there's any type of leak on the exhaust gaskets. Usually they will warranty their service for a month or so as well; you might be able to bring it back in and have them try to figure it out. Did you have it done at the stealer?
Good luck!
Trending Topics
Thread Starter
|
Road Captain
Joined: Jun 2010
Posts: 711
Likes: 0
From: Eastern Shore, MD
Yeah, that's kinda wierd that they didn't do any tune adjustment and it's backfiring. Man, you have an 06 with only 1000 miles on it!
I wouldn't think the oil level would have a lot to do with the backfiring. +1 one on seeing what the plugs look like. Did they change the plugs or just put the same ones back in?
I guess you could also see if there's any type of leak on the exhaust gaskets. Usually they will warranty their service for a month or so as well; you might be able to bring it back in and have them try to figure it out. Did you have it done at the stealer?
Good luck!
I wouldn't think the oil level would have a lot to do with the backfiring. +1 one on seeing what the plugs look like. Did they change the plugs or just put the same ones back in?
I guess you could also see if there's any type of leak on the exhaust gaskets. Usually they will warranty their service for a month or so as well; you might be able to bring it back in and have them try to figure it out. Did you have it done at the stealer?
Good luck!
They put the same plugs back in. Yup, the stealer.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
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
The Best and Worst Harley-Davidson Moves of 2025
Verdad Gallardo
Road Warrior
Joined: Sep 2006
Posts: 1,278
Likes: 2
From: Mission,BC.Canada
An 06 with 1000 miles, sounds like the bike was sitting for a while. If it was improperly stored, the carb could be gummed up. The carb mite need to be cleaned, something your tech should have thought of. What color are your spark plugs?
Sounds like a pretty standard lean backfire,or in other words "carbfart"
Do a search,you'll find hundreds of posts.
Initial mixture is lean and when then vacuum increases the slide lifts allowing a lean mix of air and fuel in,and then it backfires.
I run a custom made intake breather setup on my 883 with a 48 slow at 1/2 turn out.
Ive tried alot of options,from different needles,needle shims,various main jet sizes,,and One of the best options personally i feel would be a higher flow accelerator pump,with a 45 pilot.
I dont beleive the stock pilot/needle combo responds efficiently to the air intake amount
Do a search,you'll find hundreds of posts.
Initial mixture is lean and when then vacuum increases the slide lifts allowing a lean mix of air and fuel in,and then it backfires.
I run a custom made intake breather setup on my 883 with a 48 slow at 1/2 turn out.
Ive tried alot of options,from different needles,needle shims,various main jet sizes,,and One of the best options personally i feel would be a higher flow accelerator pump,with a 45 pilot.
I dont beleive the stock pilot/needle combo responds efficiently to the air intake amount