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  #1  
Old 22nd March 2023
berickson64 berickson64 is offline
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Sportster/Buell Model: XLH 1100
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Default Carb question

Good morning. I need some help with troubleshooting. I have an '86 1100 with about 10k miles on it. It has a cam, open exhaust and a screaming eagle air cleaner. I rebuilt the carb about 3 years ago because I was having all kinds of issues and it was fine since then.

Recently, when I get on the throttle more than 1/4 of the way, it coughs and sputters until I ease up. I cleanded the tank and checked the petcock for blockage/steady flow. I have pulled the carb and cleaned it making sure the jets were clear. It was already remarkably clean. I expected more varnish.

I am guessing it may be something with the accelerator pump. Could that diaphragm have gone bad in three years? I don't see any cracks.

Any other thoughts?
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  #2  
Old 22nd March 2023
John Harper John Harper is offline
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Have you change your intake manifold gaskets, they could be 37 years old.

John
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  #3  
Old 22nd March 2023
berickson64 berickson64 is offline
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I changed them 3 years ago and haven't taken the manifold off since. Do you think the VOE switch could be causing this? I haven't tested that yet.
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Old 22nd March 2023
JB in NC JB in NC is online now
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It is possible that your problem is ignition related. When you open the throttle you are loading the motor and if the ignition is marginal, you will get misfires.

Jim
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Old 22nd March 2023
rwharris rwharris is offline
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Check gas cap to see if it is venting . Roger
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