Still have Carb issues on a 93 FXLR
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Joined: Apr 2008
Posts: 82
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From: newbury, England
Still have Carb issues on a 93 FXLR
I have checked the mixture, bike starts first time, runs well, idle good.
when i back off the thottle it backfires a little, and at 70mph, the occasional cough from the carb. Plugs colour is a eggshell or very light tan.
I am running a OEM carb with 2 into 1 Vance and Hines, with a K&N filter.
I have read that you can upgrade the needle to one from a Sportster, but what year?
What do i need to do to sort this slightly annoying problem.
I live in the country, and the bike scares the **** out of horses most times, but when it coughs back in the carb, horses and riders get really pissed.
Any help guys.
Dee
PS I dont want to changed the Carb to a Mikuni etc.
when i back off the thottle it backfires a little, and at 70mph, the occasional cough from the carb. Plugs colour is a eggshell or very light tan.
I am running a OEM carb with 2 into 1 Vance and Hines, with a K&N filter.
I have read that you can upgrade the needle to one from a Sportster, but what year?
What do i need to do to sort this slightly annoying problem.
I live in the country, and the bike scares the **** out of horses most times, but when it coughs back in the carb, horses and riders get really pissed.
Any help guys.
Dee
PS I dont want to changed the Carb to a Mikuni etc.
Road Warrior
Joined: Nov 2007
Posts: 1,641
Likes: 4
From: south of Boston
your plugs seems okay, but you might be running a little lean considering the K&N and 2-1 pipes
if the carb is truly stock like you say, you probably have a 175 main and 40 pilot... you could probably use at least a 185 and 45
also, you gotta dig out the air/fuel adjuster underneath and make some adjustments, afterward
if the carb is truly stock like you say, you probably have a 175 main and 40 pilot... you could probably use at least a 185 and 45
also, you gotta dig out the air/fuel adjuster underneath and make some adjustments, afterward
Outstanding HDF Member
Joined: Nov 2010
Posts: 2,591
Likes: 68
From: Big Bear City, CA
Another option would be having yours Performance Tuned by Dale at Killer MC Products. A lot of positive feedback on his carbs has been posted here in the Evo section as well. I ordered one 4 weeks ago. I'll post results as well once I receive & install it. You can read more about it on his eBay auction: http://www.ebay.com/itm/270620924203...84.m1423.l2649
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
You could chase your tail around and round looking to cure this and we will share your pain, but diagnosing elusive problems over the internet is not easy! There comes a time when a visit to an expert can pay dividends, as he may well put his finger straight on the problem and sort it in no time. So don't spend too much time annoying the local horses, go and get it fixed!
Intermediate
Joined: Jun 2011
Posts: 32
Likes: 0
From: Fairfield, CT
This is the needle http://www.cv-performance.com/cvp-n65-needle/
Here is a good article on CV carbs http://www.nightrider.com/biketech/hd_cv_mods.htm great site lots of good info.
Running a K&N filter and 2 into 1 exhaust with stock carb setup will make your engine run on the lean side as already mentioned. It's not ideal to keep running like that IMO. That being said I think you should have the carb re-jetted and tuned. As far as your problem of little back firing and carb cough up at speed. Other than the carb being the problem, you could have vacuum/intake leak or a faulty V.O.E.S.
good luck
Here is a good article on CV carbs http://www.nightrider.com/biketech/hd_cv_mods.htm great site lots of good info.
Running a K&N filter and 2 into 1 exhaust with stock carb setup will make your engine run on the lean side as already mentioned. It's not ideal to keep running like that IMO. That being said I think you should have the carb re-jetted and tuned. As far as your problem of little back firing and carb cough up at speed. Other than the carb being the problem, you could have vacuum/intake leak or a faulty V.O.E.S.
good luck
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
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I have checked the mixture, bike starts first time, runs well, idle good.
when i back off the thottle it backfires a little, and at 70mph, the occasional cough from the carb. Plugs colour is a eggshell or very light tan.
I am running a OEM carb with 2 into 1 Vance and Hines, with a K&N filter.
I have read that you can upgrade the needle to one from a Sportster, but what year?
What do i need to do to sort this slightly annoying problem.
I live in the country, and the bike scares the **** out of horses most times, but when it coughs back in the carb, horses and riders get really pissed.
Any help guys.
Dee
PS I dont want to changed the Carb to a Mikuni etc.
when i back off the thottle it backfires a little, and at 70mph, the occasional cough from the carb. Plugs colour is a eggshell or very light tan.
I am running a OEM carb with 2 into 1 Vance and Hines, with a K&N filter.
I have read that you can upgrade the needle to one from a Sportster, but what year?
What do i need to do to sort this slightly annoying problem.
I live in the country, and the bike scares the **** out of horses most times, but when it coughs back in the carb, horses and riders get really pissed.
Any help guys.
Dee
PS I dont want to changed the Carb to a Mikuni etc.
The needle you want is from an 1988 XLCH I think it's an N65C but check it first.I use this needle in a CV carb.
All my engines burble on decel,they're basicially registered race engines, It's when the carb goes back on the pilot ,makes sense as if it don't burble it's too rich FOR ME. Don't give a toss what others do.Burble good bang and explode bad.
Ever heard a race engine that don't burble on decel.
Anyhoo sounds lean somewhere to me.
Cheers hth.
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