1979 GL1000 will not idle


Information and questions on GL1000 Goldwings (1975-1979)
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Grabcon
Posts: 3
Joined: Wed May 22, 2013 10:58 am
Location: Castle Rock, Colorado
Motorcycle: 1991 St1100
1976 CB750F
1974 CB750K
1978 CB550K

1979 GL1000 will not idle

Postby Grabcon » Wed May 22, 2013 11:14 am



Hi
I am new to the forum and am asking this question on behalf of a neighbor. He asked me to work on his bike today. A 1979 GL1000 with about 54k miles.

The bike will not run under 2500 rpms. I kind of went through the things I normally do on my other 4 banger Hondas. I tightened all carb clamps, checked the spark plugs, plug caps and wires, check choke operation, air filter and checked for vacuum leaks on the intake side of the carbs.

I hooked up the sync gauges but idling at 2500 it is hard to get a reasonable read. I was able to drop the idle to 1100 for a couple of minutes and the sync looked good on the carbs. But it would not stay running.

The symptom is the bike will not idle below 2500, if you adjust the idle down you can get it to 2000 but then it just drops off and dies. Hitting the throttle does little good at this point it is hard to recover. The bike also starts hard. It is very finicky when trying to start. Also when he drove away the bike seemed not to have any low end power. He said that it crusies fine on the highway.

I will be honest and say I have never worked on a GL before but things seem straight forward. But I am stumped. Any thoughts?

Thanks



User avatar
virgilmobile
Posts: 7663
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: 1979 GL1000 will not idle

Postby virgilmobile » Wed May 22, 2013 12:30 pm

At 2000 rpm,the bike is drawing fuel from the main jets...I'll bet 34 cents that the idle/slow speed jets are plugged.....It's probably time to do a carb refresh....A complete rebuild may not be necessary if it's just plugged up....I like to use brake cleaner instead of carb cleaner too.

Pay close attention to a few details after cleaning the jets and all the slow speed passages.......
so you don't have to take them off more than once.
1.The slides....they must be polished clean and operate butter smooth in the cap...DO NOT mix them up....eg...this cap,this slide,this carb.....mark them.

2.The composite floats....if your not positive that they do not absorb fuel and sink in the bowl(this happen to me).Dip each one in a can of Polyurethane(2 coats) and dry for 24 hours to seal them.

3..Set the float level by the book.

4..Bench adjust the throttle valves for equal opening...This is a Pre-sync.

5..Hook a shop vac to each carb,one at a time,and operate the throttle.Look at the slide to be certain they do rise and not stick.

6...Hook up a fuel line and fill the carbs....check for leaks...

This way,when you put them back on,just a sync should be all that's necessary.
When you sync the carbs,keep readjusting the engine to 1000-1100 rpm....after it's done,idle it back to the 850-900 range.

User avatar
virgilmobile
Posts: 7663
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: 1979 GL1000 will not idle

Postby virgilmobile » Wed May 22, 2013 12:34 pm

One more thing....Don't expect this to be just a couple of hour job.....
I think when I did mine...and I've done them before,Start to finish was most of the daylight on a Saturday... :D Including lunch.

Depending on how good a neighbor you are...there's the points to look at,ignition timing,timing belts,brakes....oh the list goes on and on.... ;)

Grabcon
Posts: 3
Joined: Wed May 22, 2013 10:58 am
Location: Castle Rock, Colorado
Motorcycle: 1991 St1100
1976 CB750F
1974 CB750K
1978 CB550K

Re: 1979 GL1000 will not idle

Postby Grabcon » Wed May 22, 2013 3:00 pm

Thanks. I was thinking the same. I did ask if he had ever done the carbs and he said no. So he bought the bike in the late 80s so it is time. I will pass this along to him. I am a good neighbor but not that nice where Iwill do all that is listed.

Thanks again.

User avatar
virgilmobile
Posts: 7663
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: 1979 GL1000 will not idle

Postby virgilmobile » Wed May 22, 2013 3:49 pm

I understand...help where you can without being his mechanic. :)

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blackwolfs8
Posts: 34
Joined: Tue Jul 10, 2012 7:51 pm
Location: Devils Lake, North Dakota
Motorcycle: 1981 GL1100 interstate

Re: 1979 GL1000 will not idle

Postby blackwolfs8 » Sat May 25, 2013 9:39 pm

Just somethin I bumped into my 81 wouldnt idle after replacing my fuel pump it purrs,,,

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bohdan
Posts: 189
Joined: Thu Apr 12, 2012 7:39 am
Location: Venice, Florida
Motorcycle: 1977 GL1000
1977 GL1000
1977 GL1000
1993 GL1500
2013 GL1800
2013 GL 1800 trike
2009 Yamaha

Re: 1979 GL1000 will not idle

Postby bohdan » Mon May 27, 2013 8:01 pm

Check your ballast resistor. If it has one. not sure about the 79's. My 77 wouldn't idle either. Start like a champ and die. Just recently changed the ballast resistor and once it got hot it too went south. Try to bypass as a temporary measure. If it runs, maybe it is time to get new coils.




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