1985 GL1200 Runs Rough


Information and questions on GL1200 Goldwings (1984-1987)
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captbob
Posts: 2
Joined: Fri Aug 21, 2015 10:05 am
Location: Camdenton, Mo
Motorcycle: 1985 GL1200 Interstate

1985 GL1200 Runs Rough

Postby captbob » Fri Aug 21, 2015 10:15 am



I have 1985 GL1200 with only 17K miles on it. I was out riding last week and pretty high in the rpm's while accelerating and all of a sudden my bike started missing badly. I was able to ride it the 10 miles home but the miss never went away and was present at all rpm levels. I have replaced and gapped the plugs, did a compression test which was dead on, checked the timing and it was good. I am getting spark to all 4 plugs. I even swapped out the cdi from another bike but the issue still exists. Sprayed wd 40 around intake boots but did not affect the idle. The bike starts right up and idles fine but when I give it gas it has a constant miss. It does not smoke or backfire. Has anyone had this issue. It came on suddenly and I was at a higher rpm.



User avatar
wingman12
Posts: 610
Joined: Fri Aug 22, 2014 5:01 pm
Location: Land of Lincoln
Motorcycle: 1999 gl1500 se

Re: 1985 GL1200 Runs Rough

Postby wingman12 » Fri Aug 21, 2015 11:55 am

my guess would be your carbs are dirty. Your bike is 30 years old and only got 17,000 miles, that means it has not run much. If I were you I would load up with a fresh tank of 87 oct gas and add 1 16 oz can of seafoam, take it for a short ride to get the seafoam into the carbs, let the bike sit until the next day while you change the plugs etc. more importantly do you have any idea if the timing belts have been changed recently??? if not, you need to do that before you go for a ride again, the last thing you want to happen is break an old belt and possible ruin your new ride. :D :D

captbob
Posts: 2
Joined: Fri Aug 21, 2015 10:05 am
Location: Camdenton, Mo
Motorcycle: 1985 GL1200 Interstate

Re: 1985 GL1200 Runs Rough

Postby captbob » Fri Aug 21, 2015 12:08 pm

Thanks for the response. I have cleaned the carbs and put a new rebuild kit in them. I also checked the fuel pump and filter. The timing belts have been changed recently. The problem just came on all of a sudden while I was winding up through the gears. Seems to be a constant miss. I have owned and worked on bikes for a long time and never ran into this issue. It holds good compression when doing a compression test which should eliminate any type of valve issue. It is getting a good spark to all 4 cylinders. I have put close to 3k on it in the past year since I have owned it with no issues. I have owned and worked on bikes for 30 years and always seem to figure it out but this has me stumped.

User avatar
wingman12
Posts: 610
Joined: Fri Aug 22, 2014 5:01 pm
Location: Land of Lincoln
Motorcycle: 1999 gl1500 se

Re: 1985 GL1200 Runs Rough

Postby wingman12 » Fri Aug 21, 2015 12:31 pm

ok then, you just eliminated any possibilities that I would have started with. I read a thread yesterday concerning a similar symptom you are describing, it had to do with the voltage being too high or too low out of the regulator. I will see if I can find it and let you know. My mind these days is getting cloudier as time goes on. :D :D

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virgilmobile
Posts: 7656
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: 1985 GL1200 Runs Rough

Postby virgilmobile » Fri Aug 21, 2015 3:21 pm

A sudden stop of one running cylinder usually indicates a loss of fuel.Start from cold.. Idle the engine for 8 seconds and shut down..lightly tap each header to identify which cylinder is dead.Open the drain screw on that carb with a rag under it.drain it..blow air into the intake if you can to force any gunk out.Restart and test.
It sounds like there's water/slimy gunky stuff in the bowl.it will not flow through the jets well and usually plugged them up.




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