rough at lower rpm's


Information and questions on GL1100 Goldwings (1980-1983)
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oswoody
Posts: 18
Joined: Fri Jan 24, 2014 2:12 pm
Location: Louisburg, NC
Motorcycle: 1981 GL1100i

rough at lower rpm's

Post by oswoody »



I have a 1981 GL1100 I. 45,000 original miles. Lately, after the bike is well warmed up, I find that when cruising at 35 mph to 45 or 50, it will periodically miss. It feels and sounds like one or more cylinders are not firing. then, after a few seconds, it's back to running smoothly. No backfire. At high rpm and speed it does not do this. I thought perhaps carbs needed sync. So I got a gauge set and sync'ed the carbs. Although it did run better, I still had the issue of miss firing or not firing at all at low rpms for a few moments. This has me pretty perplexed. Any help would be appreciated. I don't know if this helps, but at times it is difficult to start. Seems easy to flood. I realize this might be a completely separate issue.


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virgilmobile
Posts: 9101
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: rough at lower rpm's

Post by virgilmobile »

Corroded electrical connection at the pulse coil 4 wire plug.
Low battery volts.
Start it cold.Idle only.do not rev.run for 20 seconds.shut down.. Lightly tap each header to check exhaust temp..They should all be equally warm..The cold one is the misfiring one...
Start it again.. idle only..locate near the battery the 4 wire plug..wiggle it about..a poor connection there can cause a poor/intermittent spark..
Also measure the battery volts while your there...it needs to be above 12.5 at a idle and increase to 14.2 at 3500 rpm.
Idle the bike.Lift each plug wire from the plug about a 3/4 inch or so.One at a time.You should hear a good healthy popping.If you pull the plug wire off,that cylinder and it's opposing cylinder should die and most likely kill the engine.
User avatar
virgilmobile
Posts: 9101
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: rough at lower rpm's

Post by virgilmobile »

Also.. the kill switch.. All the ignition electric runs through it.. Corroded contacts and the ignition system suffers. There kinda easy to disassemble and clean..
oswoody
Posts: 18
Joined: Fri Jan 24, 2014 2:12 pm
Location: Louisburg, NC
Motorcycle: 1981 GL1100i

Re: rough at lower rpm's

Post by oswoody »

Thank you. I will give that a try.


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