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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 3rd April 2012
marty_hart marty_hart is offline
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Default Sportster 883 95 coughing need help

Hi everyone.
Here's my probleme. I have a 95 sportster with stock pipe and stock CV carb with the original jetting inside. The only change I've made last year was a retro air filter .When I ride it around 45 mph on the 3rd or 4th gear (give just a little bit of throttle), my carbs start to cough sometime. One shot or two times in a row. I have no probleme to start the bike.

I wonder what to check first? Intake gasket leak? Jetting? Air/fuel mixture screw? I need some advises. Thanks!

By the way sorry for my english....it's not perfect yet.
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  #2  
Old 3rd April 2012
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JacksBrother JacksBrother is offline
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Quote:
Originally Posted by marty_hart View Post
Hi everyone.
Here's my probleme. I have a 95 sportster with stock pipe and stock CV carb with the original jetting inside. The only change I've made last year was a retro air filter .When I ride it around 45 mph on the 3rd or 4th gear (give just a little bit of throttle), my carbs start to cough sometime. One shot or two times in a row. I have no probleme to start the bike.

I wonder what to check first? Intake gasket leak? Jetting? Air/fuel mixture screw? I need some advises. Thanks!

By the way sorry for my english....it's not perfect yet.
Welcome to the Forum! It sounds a bit like you may be going a little lean when accellerating at lower RPM. That condition is exactly why the CV carb uses an accellerator pump-- it gives a squirt of gas to richen the mix at this critical point. Naturally, the pumps wear out after years of flexing over and over again. Since you are basically running a stock motor (even considering your "retro" air cleaner), your stock jetting should be just fine. If it were me (and it has been) I would replace your accellerator pump-- its fairly cheap, easy to do, and makes a nice afternoon project. Even if its not the root cause, it certainly won't hurt anything on a 17 year old bike. However, I would be willing to bet that it solves your problem. Keep us informed.
Good Luck!
Joe
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Old 3rd April 2012
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Welcome Marty !

I would replace the acc pump

But lets look at the idle mix too !
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Old 3rd April 2012
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To THE FORUM Marty!

I have nothing else to add, because I agree with both of them!
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