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1983 GL1100 Interstate

So...now that I have a properly-functioning electrical system, I need to get some advice on the engine....

While working on the wiring today, I had to let the engine run for a bit to keep the battery charged because I'd had the lights on for so long. She started up just fine and sounded good with the choke full-on (it was about 69-70 degrees at the time here in New Hampshire). After she warmed up a bit I closed the choke about half-way and she started to sound really, really rough. Sort of like she was running along on only two cylinders. When I tweaked the throttle (gently, of course) she caught up to herself and sounded perfectly smooth. Combine this little incident with the fact that she's a bit rough going down the road and I'm wondering if I've got more than a carb-rebuild on my hands....?

Ideas, anyone? Thanks a bunch!

Jeremy
 

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Good chance you have dirty carbs. It's worth a try to run a couple of tanks of fuel thru it with seafoam additive if it runs well enough for you to ride it. If no do zsearch on carb cleaning; lots and lots of infor here. Good luck. (this approack made my recently acquired GL1500 run much better after the 3rd tankful with seafoam.)
 

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Jeremy, cldryder has good advice. I used Seafoam in my 1200 after it had been sitting for 2 years. I used it a bit stronger than the can says with no problems. In the end, I had to pull the carbs and clean them one at a time with spray carb cleaner and compressed air. But the Seafoam did help.
 

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I also agree, Sea foam brought my 82 1100 from 25 to 32 MPG in 3 tanks full. But after cleaning the carbs it runs like a champ and I'm getting 42 MPG.
 

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garthfan0523 wrote:
1983 GL1100 Interstate

So...now that I have a properly-functioning electrical system, I need to get some advice on the engine....

While working on the wiring today, I had to let the engine run for a bit to keep the battery charged because I'd had the lights on for so long. She started up just fine and sounded good with the choke full-on (it was about 69-70 degrees at the time here in New Hampshire). After she warmed up a bit I closed the choke about half-way and she started to sound really, really rough. Sort of like she was running along on only two cylinders. When I tweaked the throttle (gently, of course) she caught up to herself and sounded perfectly smooth. Combine this little incident with the fact that she's a bit rough going down the road and I'm wondering if I've got more than a carb-rebuild on my hands....?

Ideas, anyone? Thanks a bunch!

Jeremy
Jeremy, what you experienced is not all that uncommon.. Running with full enrichener (choke) tends to load the spark plugs with fuel. Even going back to 1/2 enrichener after they are loaded a little will still leaves a little uneven running. If you were riding the bike you would be up off the idle circuit & probably wouldn't notice any problem. When idling for a while you really should open the enrichener as far as possible then use the throttle lock (if you have one) to hold the idle up..

The rough running going down the road could be a carb problem, could be a spark plug problem, or could be a plug wire problem, or could be engine mechanical related like compression, valves or, intake leak.. You will have to do some testing & looking to distinguish what is causing your problem.


Twisty
 
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