High idle on cold start


Information and questions on GL1000 Goldwings (1975-1979)
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Vir Honestus
Posts: 6
Joined: Sun May 08, 2016 10:38 am
Location: North Royalton, Ohio
Motorcycle: 1977 Honda goldwing gl1000

High idle on cold start

Postby Vir Honestus » Wed May 18, 2016 12:55 pm



Hi there, so i have recently bought a 1977 honda goldwing from a friend of mine. It has sat uncovered for a few months. I replaced the fuel pump and battery first since the fuel pump was leaking out of the weep hole. The issue I am having now is that when i start up the bike with full choke it revs up to 4k rpm. Im assuming that this is extremely high for a start up idle and am wondering what could be the issue. Also if i try to meter the clutch in so that the rpm goes to 3k the bike begins to backfire. Any help with this issue would be appreciated.



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virgilmobile
Posts: 7663
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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: High idle on cold start

Postby virgilmobile » Wed May 18, 2016 3:30 pm

As I recall from many years ago,when the choke is pulled,the lever also moves the throttle linkage.Look close at the mechanism as you operate the choke.You may see this part contact the throttle linkage.A slight bend/adjustment of this to close the throttle a bit should help.
I believe mine would idle up to around 1500Rpm with the choke on.
I used the choke full on for just a minute then backed it to half choke a few minutes more before the bike would settle down.

Vir Honestus
Posts: 6
Joined: Sun May 08, 2016 10:38 am
Location: North Royalton, Ohio
Motorcycle: 1977 Honda goldwing gl1000

Re: High idle on cold start

Postby Vir Honestus » Mon May 23, 2016 5:38 pm

Hi there sorry for the delay in a response. I checked the throttle linkage as i operated the choke and didn't notice any movement in the linkage. I recently checked for vacuum leaks and found none.

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spiralout
Posts: 1050
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: High idle on cold start

Postby spiralout » Fri May 27, 2016 11:50 pm

Look at the pics on this page http://www.randakksblog.com/throttle-return-spring-details/
The choke lever/arm is to the left of the throttle bellcrank. That lever is pushed by the cam on the choke shaft and pivots at the bottom. At the lower right side of the lever is a "tab". That tab pushes the bellcrank when the lever moves. Something screwy there is the only reason I can think of that it'd idle that high when fully choked. If you can't figure that out, I'd just not fully choke it, just give it the choke it needs until it's warmed and responsive.

Vir Honestus
Posts: 6
Joined: Sun May 08, 2016 10:38 am
Location: North Royalton, Ohio
Motorcycle: 1977 Honda goldwing gl1000

Re: High idle on cold start

Postby Vir Honestus » Sat May 28, 2016 7:02 am

Ok I'll take a look at that then but just in case anyone can figure something different out here is a video of a cold startup of my bike.


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Maz
Posts: 237
Joined: Tue May 19, 2015 4:43 am
Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200

Re: High idle on cold start

Postby Maz » Sat May 28, 2016 10:11 am

From the 'chugging' at idle, with no choke on, I would say that firstly, it is not running on 4 cylinders. The idle speed is about right, but I think the idle screw has been turned in to compensate for this. When the engine is running at 3 - 4,000, it sounds better which makes me suspect a blocked idle jet. If those carbs haven't been cleaned or rebuilt, I would say that now is the ideal time to do it. While they are off, it will give you a great opportunity to check all of the linkages and see that everything is moving as it should be.

Maz
Nostalgia is not what it used to be!

Vir Honestus
Posts: 6
Joined: Sun May 08, 2016 10:38 am
Location: North Royalton, Ohio
Motorcycle: 1977 Honda goldwing gl1000

Re: High idle on cold start

Postby Vir Honestus » Sat May 28, 2016 10:19 am

Thank you for the response. This bike is "new to me" so I have no idea if they have been rebuilt or not. My guess is no as they appear dirty and before I got the bike it say uncovered for a few months. My only issue is that I've never really messed with carbs so rebuilding them im hesitant on.

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Maz
Posts: 237
Joined: Tue May 19, 2015 4:43 am
Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200

Re: High idle on cold start

Postby Maz » Sat May 28, 2016 2:47 pm

There are many people on here who have been in the same situation, myself included. Use the information available on here and on Randakks website. Also check out the Wingovations site, run by John (Old Fogey on this forum) for expert advice and no-nonsense assistance.
From your description of the bikes storage, the carbs WILL need servicing. Also, change the timing belts as a matter of urgency if you don't have written proof of when / if they were changed.
Maz
Nostalgia is not what it used to be!

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spiralout
Posts: 1050
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: High idle on cold start

Postby spiralout » Sat May 28, 2016 6:34 pm

Yep, like was said, that motor isn't running on all cylinders. Verify you have spark on all first and if you do, it's the carbs. I wouldn't recommend GL1000 carbs as the ones to learn on, though, they're 40 years old and delicate. Read Octane's write up here http://ngwclub.com/forum/viewtopic.php?t=2952 and if you feel confident that you can handle it, use Randakk's kit here http://randakks.com/collections/honda-gl1000/products/randakks-own-gl1000-master-carb-overhaul-kit. If you feel that it's over your head and want them professionally overhauled, I recommend contacting Pete Boody at Pistol Pete's Services http://www.oldwings.com/
Like Maz said, John at Wingovations has some good tips, too.




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