Surging idle


Information and questions on GL1000 Goldwings (1975-1979)
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jwheels14
Posts: 9
Joined: Tue Jul 31, 2012 8:14 am
Location: Randall, IA
Motorcycle: 1979 GL1000

Surging idle

Post by jwheels14 »





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Here is a video of my problem, the idle is surging. I don't touch the throttle except for when you see my hand. It starts when it is warmed up, when it was cold it was not surging. The idle is set high to keep it running at the low point, When I turn the idle down it still surges it dies at the low point. Anybody have any ideas what is wrong.


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terryt
Posts: 288
Joined: Mon Jul 23, 2012 4:52 pm
Location: United Kingdom
Motorcycle: 1979 gl1000 trike
1989 gl1500 trike
1995 Kawasaki gt550 Trike

Re: Surging idle

Post by terryt »

Hi have you checked for any air leaks on the carbs. the plastic tops on the pistons and the rubber conectors on the manifolds. and where the manifolds bolt to the head
one thing i did notice in the vidio was the volt meter was olny reading 11volts you need to check that out as well
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Fred Camper
Posts: 1339
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: Surging idle

Post by Fred Camper »

Good video, but you have me stumped as well.
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dingdong
Posts: 4025
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: Surging idle

Post by dingdong »

It does sound like perhaps a vacuum leak. Could also be plugged idle circuits or jets. Then may be a carb sync issue.
TheArtist
Posts: 70
Joined: Fri Apr 08, 2011 1:13 pm
Location: dell rapids
Motorcycle: 1979 GL 1000

Re: Surging idle

Post by TheArtist »

I would also say carb sync. Mine did the same thing along with occasional backfire. I had one carb out of sync when i put the vacuum gauges on. You should also notice a miss on that bank.
jwheels14
Posts: 9
Joined: Tue Jul 31, 2012 8:14 am
Location: Randall, IA
Motorcycle: 1979 GL1000

Re: Surging idle

Post by jwheels14 »

I think I found the problem, one intake manifold had a broken O-ring. Now I think will get the carbs synced and that should do it.
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User avatar
Fred Camper
Posts: 1339
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: Surging idle

Post by Fred Camper »

well that broke o-ring would lean out that cylinder, so sounds like a good plan to sync once you fix that.
sfruechte
Posts: 219
Joined: Tue Mar 09, 2010 12:53 pm
Location: La Crosse, WI
Motorcycle: 1977 GL1000

Re: Surging idle

Post by sfruechte »

Good find. Just curious, how did you find it? Start taking it apart or did you spray carb cleaner or propane or something else around that area?
Thanks!
jwheels14
Posts: 9
Joined: Tue Jul 31, 2012 8:14 am
Location: Randall, IA
Motorcycle: 1979 GL1000

Re: Surging idle

Post by jwheels14 »

It is really easy to take them off so I started with the easiest thing and I lucked out and found the bad O-ring.


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