Harley Davidson Forums

Loading


Hello

Guest

Welcome to the harley davidson forum. Join our discussion today for FREE!

CREATE ACCOUNT

Membership Benefits

Get your questions answered by harley davidson community gurus and industry experts. Exchange your experience with another members. Access full features forum. Get a members discounts for your harley parts & accessories.

Carburetor high speed jet cleaning

Sportster Models

Reply
 
Thread Tools Display Modes
Old Nov 18th, 2007, 06:22 AM     #1
New Family
Ride: 1986 Sportster XL883
 
Join Date: Nov 18th, 2007
Posts: 4
My Mood: My Mood
germaic is an unknown quantity at this point
Talking Carburetor high speed jet cleaning

My Sportster carburetor does not work well at high speed. What do I need to do to clean my high speed jet?
Could someone, please, help me?
germaic is offline   Reply With Quote
Old Nov 18th, 2007, 07:33 AM     #2
Wise Member
Ride: 0
 
Join Date: Jun 21st, 2007
Posts: 26,212
My Mood: My Mood
glider is on a distinguished road
Re: Carburetor high speed jet cleaning

Assuming that it is jetted properly,It sounds like you have a buildup of sediment from the tank in the bottom of the float bowl. If it ran fine previously, then this is probably what the problem is if it looses power in the upper throttle positions like high speed.

The high speed jet is at the lowest point in the float bowl so it is the first affected when you have sediment in the float bowl.

Look between the cylinders from the horn side of the bike and you'll see a brass screw in the base of the float bowl. Open it up a few turns and allow a few ounces of fuel to drain out which will come out in front of the rear tire. The petcock should be open when you do this and if you have a vacuum petcock you'll have to apply vacuum to open it being the motor isn't running when you do this.
Take it for a ride and when you come back, do it again.

glider is offline   Reply With Quote
Old Nov 18th, 2007, 12:05 PM     #3
Community Guru Wannabe
Ride: 1995 FLHTC
 
Join Date: Oct 14th, 2007
Location: Ontario
Posts: 923
My Mood: My Mood
dangerdan is an unknown quantity at this point
Re: Carburetor high speed jet cleaning

How is it possible for sediment to enter a carb from the tank with an inline gas filter.
dangerdan is offline   Reply With Quote
Old Nov 18th, 2007, 12:47 PM     #4
Community Guru Wannabe
Ride: 1995 FLHTC
 
Join Date: Oct 14th, 2007
Location: Ontario
Posts: 923
My Mood: My Mood
dangerdan is an unknown quantity at this point
Re: Carburetor high speed jet cleaning

What about EFI models...
I dont know anything about Harley EFI but the Honda VTX1800 has Advanced high-pressure programmed fuel injection (PGM-FI) features 42mm-diameter throttle bodies delivering air to two specially designed Denso(r) 50-psi high-pressure fuel injectors. Fuel is delivered through 12 nozzle holes in each injector, producing an atomized fuel mixture that is highly combustible for maximum efficiency and power.

So how does Honda with EFI get around this. The last thing you want is to clog up the injectors or is this really an issue with any EFI system
dangerdan is offline   Reply With Quote
Old Nov 18th, 2007, 01:09 PM     #5
Community Guru Wannabe
Ride: 1995 FLHTC
 
Join Date: Oct 14th, 2007
Location: Ontario
Posts: 923
My Mood: My Mood
dangerdan is an unknown quantity at this point
Re: Carburetor high speed jet cleaning

Ok that makes sense.

Are there prooven product that I can use to clean my SS Super E carb without having to take it apart ?
dangerdan is offline   Reply With Quote
Old Nov 18th, 2007, 01:21 PM     #6
Community Guru Wannabe
Ride: 1995 FLHTC
 
Join Date: Oct 14th, 2007
Location: Ontario
Posts: 923
My Mood: My Mood
dangerdan is an unknown quantity at this point
Re: Carburetor high speed jet cleaning

Thanks Hobbit
dangerdan is offline   Reply With Quote
Old Nov 18th, 2007, 03:47 PM     #7
Wise Member
Ride: 0
 
Join Date: Jun 21st, 2007
Posts: 26,212
My Mood: My Mood
glider is on a distinguished road
Re: Carburetor high speed jet cleaning

Quote: Originally Posted by dangerdan View Post
How is it possible for sediment to enter a carb from the tank with an inline gas filter.

Like Hobbit said it only stops the larges particles. The sediment is so fine that it goes right through that screen in the tank.
glider is offline   Reply With Quote
Old Nov 18th, 2007, 03:50 PM     #8
Wise Member
Ride: 0
 
Join Date: Jun 21st, 2007
Posts: 26,212
My Mood: My Mood
glider is on a distinguished road
Re: Carburetor high speed jet cleaning

Quote: Originally Posted by dangerdan View Post
What about EFI models...
I dont know anything about Harley EFI but the Honda VTX1800 has Advanced high-pressure programmed fuel injection (PGM-FI) features 42mm-diameter throttle bodies delivering air to two specially designed Denso(r) 50-psi high-pressure fuel injectors. Fuel is delivered through 12 nozzle holes in each injector, producing an atomized fuel mixture that is highly combustible for maximum efficiency and power.

So how does Honda with EFI get around this. The last thing you want is to clog up the injectors or is this really an issue with any EFI system
Can't comment on the Honda's, but the Harley FI bikes have a fuel filter inside the tank in the line that takes most everything out of the fuel because of the orifices in the injectors being so small.

You can see the filter here closest to the box coming from the pump.


Last edited by glider; Nov 18th, 2007 at 04:06 PM.
glider is offline   Reply With Quote
Old Nov 20th, 2007, 02:07 AM     #9
New Family
Ride: 1986 Sportster XL883
 
Join Date: Nov 18th, 2007
Posts: 4
My Mood: My Mood
germaic is an unknown quantity at this point
Re: Carburetor high speed jet cleaning

Thanks a lot to allof you for your comments. They are very helpful, particularly the answer from Glider with a nice picture of the carburetor.
Have a nice ride!
germaic is offline   Reply With Quote
Old Jun 13th, 2008, 03:53 PM     #10
New Family
Ride: 1986 Sportster XL883
 
Join Date: Nov 18th, 2007
Posts: 4
My Mood: My Mood
germaic is an unknown quantity at this point
Re: Carburetor high speed jet cleaning

Hello Glider,
I only tried to clean he carb last week and I did not find the screw you showed on the picture. My sportster is a 1986/87. What shall I do?
Remove the carb and dismantle it to clean the main jet and the the little tank?
Thanks a lot for help. I have no access without taking the carb out.
germaic is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ultra front end wobble at high speed doug rooney Touring Models 13 Feb 18th, 2011 01:02 PM
High Speed Wobble Vibratinharley Wheels 21 Jun 14th, 2010 05:59 PM
01 FXDXT High Speed Cornering Wobbles billnapabill Dyna Models 14 Apr 20th, 2010 04:34 PM
Intermittent Popping at High Speed Texicun Engine, Fuel and Exhaust 6 Nov 4th, 2008 04:27 PM
high speed wobble formike56 Wheels 4 Aug 22nd, 2008 11:00 AM