1986 GL1200 runs rough at low rpm


Information and questions on GL1200 Goldwings (1984-1987)
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bwagner6
Posts: 88
Joined: Wed May 30, 2012 6:16 pm
Location: Norwalk, Ohio
Motorcycle: 1986 Gl1200A Aspencade

1986 GL1200 runs rough at low rpm

Postby bwagner6 » Wed May 30, 2012 6:28 pm



Hello everyone... I just purchased a 1986 Aspencade with only 5000 miles! She is clean and well taken care of but obviously hasn't been driven much. It is running poorly at lower rpms and pops back through the carb. Very cold blooded. Has a fresh set of plugs and air filter. Any clues on where to start in solving this issue? Also, at what mileage do you worry about the timing belts?
Thanks for the input in advance.



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seabee_
Posts: 494
Joined: Sun May 29, 2011 8:17 pm
Location: sterling heights, mi
Motorcycle: 1985 Honda Goldwing GL1200
117k miles
1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: 1986 GL1200 runs rough at low rpm

Postby seabee_ » Wed May 30, 2012 6:44 pm

Sounds like the low speed idle circuits are clogged. Probably the result from sitting for long lengths of time. Goldwings don't take well to sitting around. They like to be ridden. :D How old is the gas in the tank? You might try running 1/2 a can of Seafoam in the gas tank to try and clean the carbs out. Not a guaranteed fix, but might help. Worst case, I suggest removing the carbs and doing a complete cleaning and rebuild on them. Then have the carbs synched. Congrats on the new 'wing and welcome to the site. 5,000 miles on the clock? WOW, what a find.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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bwagner6
Posts: 88
Joined: Wed May 30, 2012 6:16 pm
Location: Norwalk, Ohio
Motorcycle: 1986 Gl1200A Aspencade

Re: 1986 GL1200 runs rough at low rpm

Postby bwagner6 » Wed May 30, 2012 6:51 pm

Thanks for the reply... I have heard that seafoam is a good start so I will take your advise. Sure hope it smooths out... Pulling the carbs and rebuilding sounds like a big project. Is one tank full usually enough??

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virgilmobile
Posts: 7644
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: 1986 GL1200 runs rough at low rpm

Postby virgilmobile » Wed May 30, 2012 7:32 pm

Timing belts deteriorate from use AND age.For the cheap cost....just replace them regardless of how they look or miles on them.When you do maintenance,replace them every 20-30k miles or 2-3 years.

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bwagner6
Posts: 88
Joined: Wed May 30, 2012 6:16 pm
Location: Norwalk, Ohio
Motorcycle: 1986 Gl1200A Aspencade

Re: 1986 GL1200 runs rough at low rpm

Postby bwagner6 » Wed May 30, 2012 7:56 pm

Thanks... Where can I purchase the belts and can a novice change them?

User avatar
virgilmobile
Posts: 7644
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: 1986 GL1200 runs rough at low rpm

Postby virgilmobile » Wed May 30, 2012 10:22 pm

Look in the "HOW TO "section for instructions.The gl1100 and 1200 are about the same.
A "novice" is someone that just has never done it before.
Most of us fall into that category.Changing timing belts is not complex.Just follow the instructions to a "T".
And always hand turn over the engine a few times to recheck for the third time on the timing marks.They MUST be right.
Average time to replace them....about 3 hours.Including a Coke break.Cost....about $45.Here's the numbers...
GL1200
Gates - #5043 or #T070 (2 ea.) or
NAPA - #250070 (2 ea.) or
Goodyear - #40070 (2 ea.)
Read all you can first.There's plenty of that in the search section.
Just get right down on the ground to get a accurate view of the marks.

Now onto the carbs,if the snake oil doesn't fix it...
My 1200 was the easiest of all my wings to service.It took 45 minutes to get them out and 4 hours of detailed cleaning to get then to work right.
A good sync and,my God,it will loosen your shoulder joint right up.here's my sync tool...http://www.goldwingdocs.com/forum/viewt ... 94&p=40711

User avatar
bwagner6
Posts: 88
Joined: Wed May 30, 2012 6:16 pm
Location: Norwalk, Ohio
Motorcycle: 1986 Gl1200A Aspencade

Re: 1986 GL1200 runs rough at low rpm

Postby bwagner6 » Thu May 31, 2012 4:18 am

Is it best to have a complete rebuild kit if I need to do a carb cleaning or just pull them apart and clean what is there? Never done that before either! Will need a service manual for these projects I would think....

User avatar
seabee_
Posts: 494
Joined: Sun May 29, 2011 8:17 pm
Location: sterling heights, mi
Motorcycle: 1985 Honda Goldwing GL1200
117k miles
1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: 1986 GL1200 runs rough at low rpm

Postby seabee_ » Thu May 31, 2012 5:30 am

Yes, buy the whole kit. The bike may not have high mileage but all the rubber, seals and gaskets are old. Do it right the first time so you won't be pulling and doing it again. You should get the kit from Randakks. You'll find the website thru google search. Randakks has the best quality set. Don't forget to replace the fuel filter.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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bwagner6
Posts: 88
Joined: Wed May 30, 2012 6:16 pm
Location: Norwalk, Ohio
Motorcycle: 1986 Gl1200A Aspencade

Re: 1986 GL1200 runs rough at low rpm

Postby bwagner6 » Thu May 31, 2012 9:53 am

Just put my first full tank with seafoam in the ole girl.... Hoping for the best. If I do need to pull the carbs what manual should I purchase?

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zamboni920
Posts: 250
Joined: Sun Aug 14, 2011 5:15 am
Location: Stavanger, Norway
Motorcycle: 1996 GL1500 SE with Hannigan 2+2 sidecar

Re: 1986 GL1200 runs rough at low rpm

Postby zamboni920 » Thu May 31, 2012 8:59 pm

I would say Clymers repair manuals are best. .......and I always hated Clymer :lol: .......now it is my bible for my GL1200 and GL1500.

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bwagner6
Posts: 88
Joined: Wed May 30, 2012 6:16 pm
Location: Norwalk, Ohio
Motorcycle: 1986 Gl1200A Aspencade

Re: 1986 GL1200 runs rough at low rpm

Postby bwagner6 » Mon Jun 04, 2012 5:59 pm

ok Just ordered my carb kit, manual and fuel filter from Randakk.... Seafoam isn't getting the job done fast enough for me. It's riding season! Wish me luck.... Any insights for saving time would be welcome.

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zamboni920
Posts: 250
Joined: Sun Aug 14, 2011 5:15 am
Location: Stavanger, Norway
Motorcycle: 1996 GL1500 SE with Hannigan 2+2 sidecar

Re: 1986 GL1200 runs rough at low rpm

Postby zamboni920 » Mon Jun 04, 2012 6:14 pm

Try spraying some WD-40 , carb cleaner or dish soap around intakes and hoses, while running.....you could simply have an intake air leak.

User avatar
seabee_
Posts: 494
Joined: Sun May 29, 2011 8:17 pm
Location: sterling heights, mi
Motorcycle: 1985 Honda Goldwing GL1200
117k miles
1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: 1986 GL1200 runs rough at low rpm

Postby seabee_ » Mon Jun 04, 2012 7:14 pm

When you start to tear down your carbs, take lots of pictures. They may save you time when trying to figure what goes where.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

User avatar
bwagner6
Posts: 88
Joined: Wed May 30, 2012 6:16 pm
Location: Norwalk, Ohio
Motorcycle: 1986 Gl1200A Aspencade

Re: 1986 GL1200 runs rough at low rpm

Postby bwagner6 » Thu Jun 07, 2012 7:04 pm

Well I pulled the carbs and found slow jets clogged. Its all back together and running great! Thank you all for the help!

User avatar
seabee_
Posts: 494
Joined: Sun May 29, 2011 8:17 pm
Location: sterling heights, mi
Motorcycle: 1985 Honda Goldwing GL1200
117k miles
1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: 1986 GL1200 runs rough at low rpm

Postby seabee_ » Thu Jun 07, 2012 9:17 pm

That's great. Now to get some seat time on her.
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Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic


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