Backfire through the carb under hard throttle.....unless I remove the air filter
Thread Starter
|
Novice
Joined: May 2019
Posts: 23
Likes: 0
From: Mount Olive, NJ
Backfire through the carb under hard throttle.....unless I remove the air filter
My FX runs great. Nice low idle. Really a pleasure to ride......until I goose the throttle under load. For the hell of it I tried removing the air filter which to my surprise helped. When this resolved the issue (only with a very slight hesitation) I went and replaced the air filter element. I'm using the stock air cleaner (green foam with oil). After installing the new one the problem returns. Should I go ahead and install a high flow air filter? I was really trying to keep things stock and not sure a high flow element will help. Carb mixture is non adjustable and is stock. Stock mufflers/exhaust as well.
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
if your trying to keep it stock why are you thinking about putting hi flow air filter on it
right now in NW jersey its over 100 degrees with super hi humidity and we are a 1000 feet up from sea level - no carb will work correctly
right now in NW jersey its over 100 degrees with super hi humidity and we are a 1000 feet up from sea level - no carb will work correctly
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
i would sonic clean the carb and kit it THAT is if you have owned it for a while and it did not do this till ( It was like this for a while ) I have no idea how long that is
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,569
Likes: 3,324
From: Cental, MI
Sponges are for washing the Bike... Paper is for taking tuning notes...K&N alone, Makes air Filters...and there is one that fits an O.E. Box...
If yer not gonna do it right... well.....good luck!
If yer not gonna do it right... well.....good luck!
Seasoned HDF Member
Joined: Oct 2005
Posts: 7,488
Likes: 3,687
From: Santa Klaus County, Cali
If you are gonna use the foam filter I would not oil it. Guess it works out if you live on back roads that are unpaved but other than that why?
My 49 and 65 use the copper mesh. Never oiled them and have had no problems. My 78 and 84 use the foam filter (unoiled and I have had no problems with either bike. Maybe not “stock” but I am the only one who can see it. K&N filter are probably the best on the market. not cheap but a. Worthwhile investment for sure.
My 49 and 65 use the copper mesh. Never oiled them and have had no problems. My 78 and 84 use the foam filter (unoiled and I have had no problems with either bike. Maybe not “stock” but I am the only one who can see it. K&N filter are probably the best on the market. not cheap but a. Worthwhile investment for sure.
Trending Topics
Seasoned HDF Member
Joined: Apr 2010
Posts: 9,524
Likes: 7,861
From: Long Island, New York
1- K&N makes filters that will fit stock air cleaner assemblies, I like W&W in Germany for finding the right one. Google them.
2- Carb rebuilds will clean away many issues with old units, I would buy a good kit, break it down and clean it real good (sonic if available) and put it back on the bike. You will be pleasantly surprised how much better she will run. They get gummed up in all the little passages and crevices, modern fuel sucks, it is a very worthwhile effort.
Good luck.
2- Carb rebuilds will clean away many issues with old units, I would buy a good kit, break it down and clean it real good (sonic if available) and put it back on the bike. You will be pleasantly surprised how much better she will run. They get gummed up in all the little passages and crevices, modern fuel sucks, it is a very worthwhile effort.
Good luck.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
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
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,569
Likes: 3,324
From: Cental, MI
If you are gonna use the foam filter I would not oil it. Guess it works out if you live on back roads that are unpaved but other than that why?
My 49 and 65 use the copper mesh. Never oiled them and have had no problems. My 78 and 84 use the foam filter (unoiled and I have had no problems with either bike. Maybe not “stock” but I am the only one who can see it. K&N filter are probably the best on the market. not cheap but a. Worthwhile investment for sure.
My 49 and 65 use the copper mesh. Never oiled them and have had no problems. My 78 and 84 use the foam filter (unoiled and I have had no problems with either bike. Maybe not “stock” but I am the only one who can see it. K&N filter are probably the best on the market. not cheap but a. Worthwhile investment for sure.
Hell... I gots friends in town who use Velocity stacks and about any old "bird catcher"...
They don't ride out to my Place!!!!
Last edited by Racepres; Jul 22, 2019 at 08:35 AM.
