Unbearably high idle


Information and questions on GL1000 Goldwings (1975-1979)
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Drdemos
Posts: 12
Joined: Tue Oct 30, 2012 9:41 am
Location: Shingletown, ca
Motorcycle: 1977 GL1000

Unbearably high idle

Post by Drdemos »



I finally finished my 1977 GL1000, and took it for a ride to town. I live about 45 minutes and 3000 feet elevation higher than "town." Suddenly when I got to town, I'm idling at about 4500-5000 RPMs. This is obviously problematic, and for more than just my wallet.

I rebuilt the carbs as part of restoring this bike - They were pretty fouled up. Is it possible that the throttle plates were "rigged" to be more open by the previous owners to compensate for the poor quality of the fouled up carburetors? And where is the idle adjustment screw?

Any help is greatly appreciated!


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Fred Camper
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Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: Unbearably high idle

Post by Fred Camper »

Sounds like a vacuum leak that opens up hot to me. The idle adjustment screws is down at your right side between the carbs and can be adjusted sitting on the bike, no tool needed. Try to tighten the clamps on the intake runners when it is hot next time.
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Placerville
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Location: Placerville, CA
Motorcycle: 1976 Naked Yellow

Re: Unbearably high idle

Post by Placerville »

Agree with Fred. With the bike at temp and idling, take an unlit propane torch (cracked opened a touch) and pass it slowly around the carb area. When/if you come to an area that's sucking air, the propane will be pulled in and cause the idle to jump up.
Placerville- 1976 Yellow
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dingdong
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Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: Unbearably high idle

Post by dingdong »

Did you synchronize the carbs after working on them?
Drdemos
Posts: 12
Joined: Tue Oct 30, 2012 9:41 am
Location: Shingletown, ca
Motorcycle: 1977 GL1000

Re: Unbearably high idle

Post by Drdemos »

Thanks! Not yet on the carb sync, but I wouldn't have imagined it could cause that big of a problem. It's definitely on the to do list. Thanks Fred and Placerville - I will be trying the propane tonight!
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SteveB123
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Joined: Thu Apr 05, 2012 9:29 am
Location: Winchester, Ontario, Canada
Motorcycle: 1982 1100I, 60A Poorboy, MSD coil

Re: Unbearably high idle

Post by SteveB123 »

How can you have rebuilt the carbs and not discovered the adjustment screws?
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing
Drdemos
Posts: 12
Joined: Tue Oct 30, 2012 9:41 am
Location: Shingletown, ca
Motorcycle: 1977 GL1000

Re: Unbearably high idle

Post by Drdemos »

Well, I bought Randakks rebuild kit, then followed the Clymer manual. Since I had the screw below the bell crank completely backed out, I assumed that there was perhaps some other hidden idle adjuster that I was unaware of.
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dingdong
Posts: 4024
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: Unbearably high idle

Post by dingdong »

Drdemos wrote:Thanks! Not yet on the carb sync, but I wouldn't have imagined it could cause that big of a problem. It's definitely on the to do list. Thanks Fred and Placerville - I will be trying the propane tonight!
Yes it can cause that big of a problem. Just one carb out far enough can cause this.
Drdemos
Posts: 12
Joined: Tue Oct 30, 2012 9:41 am
Location: Shingletown, ca
Motorcycle: 1977 GL1000

Re: Unbearably high idle

Post by Drdemos »

Okay, think I got it fixed. The air/fuel screws were backed WAY out, the carbs were quite out of sync, and the "boots" weren't tightened down appropriately on the carb throats. It seems to be doing okay now. Thanks for all the help.
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Fred Camper
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Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: Unbearably high idle

Post by Fred Camper »

Good to hear, nice to know what you fixed so thank you.
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dingdong
Posts: 4024
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: Unbearably high idle

Post by dingdong »

Alright! Another satisfied customer.


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