Coughing and missing out
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4th Gear
Joined: Aug 2008
Posts: 8
Likes: 0
From: Bloomfield,IN
Coughing and missing out
I got a 1985 Sportster XLX 1000 off a guy last week. It starts great, idles great and don't have any hesitation off idle once it is warm. The problem is only at highway speed / constant speed it will cough and miss out. It has a Screamin Eagle carb on it and has 160 and 58 jets. I took the carb apart and cleaned it and it made no difference. The numbers on the side of the carb says 27F8 HF30.
I have checked the timing and that it good. Also has an electronic ignition.
I have checked the timing and that it good. Also has an electronic ignition.
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Joined: Oct 2009
Posts: 1,757
Likes: 8
From: Central Florida
Whats the Plugs look like ?
The wires..to check them for voltage leaks get er In a totally dark garage NO Light.
Cover all the lights up and let yer eyes adjust to the dark.
Have a squirt bottle that will mist water,,
Start the bike,,See any Blue flashes of light round the wires??
Squirt It/ mist It,,look again.
Hold 3,000 mid throttle and do that again..
Lights,,wires leaking voltage,,
If nothing check the coils output per a service book.
Got a good CLEAN air filter In her ???
The wires..to check them for voltage leaks get er In a totally dark garage NO Light.
Cover all the lights up and let yer eyes adjust to the dark.
Have a squirt bottle that will mist water,,
Start the bike,,See any Blue flashes of light round the wires??
Squirt It/ mist It,,look again.
Hold 3,000 mid throttle and do that again..
Lights,,wires leaking voltage,,
If nothing check the coils output per a service book.
Got a good CLEAN air filter In her ???
Ultimate HDF Member
Joined: Mar 2008
Posts: 7,604
Likes: 38
From: Landrum, SC , elevation 986'
May be time to replace the rubber seals on the intake manifold. Where the intake seats to the heads and where the carb seats to the intake. 
PS: On a bike that age you should be concerned about all things made of rubber. Did you change any the gaskets on the carb when you rebuilt it? IE: Rebuild kit.
.
PS: On a bike that age you should be concerned about all things made of rubber. Did you change any the gaskets on the carb when you rebuilt it? IE: Rebuild kit.
.
Last edited by xFreebirdx; Apr 27, 2011 at 12:24 PM. Reason: PS
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