1975 GL1000 idle questions


Information and questions on GL1000 Goldwings (1975-1979)
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HaydenJ
Posts: 3
Joined: Mon Jun 10, 2024 7:37 pm
Location: Mount vernon wa
Motorcycle: 1975 GL1000

1975 GL1000 idle questions

Post by HaydenJ »



Hello!

I am new to my 1975 GL1000 and I am new to having 4 carburetors
When I bought my bike it came with a manual, ihave had and worked on many bikes and am mechanically inclined, I had no fear jumping right in!
To this point, I have set valve gap, timing, pulled and cleaned all the carbs...
Here's my problem:

I can't see to get the bike to idle good, it runs good once I on the throttle, however synching the carbs seems impossible, it will idle at 1000 for a few minutes and then start creeping uo and settle around 25 to 3000... when I blip the throttle it returns to idle very slowly if at all... when I am attempting to synchro the carbs a few peculiar things happen: it will occasionally blow off the hoses from the 3 and 4 cylinders, (this only happens at full temp, does not happen while the engine is warming up) also, if I mess with either of the synchro screws on the left side and push on them too hard the bike will idle down almost to the point of dieing (lower than idle when it returns by itself) when I was assembling the carbs my memory failed me on how the adjusters (synchro screws) went together with all the springs so I may have that wrong...

I apologize for spitting a ton of information probably fairly incoherently... any advise, pictures of synchro screws, help, or questions are appreciated!

Thank you!!!


Track T 2411
Posts: 36
Joined: Sat Mar 05, 2022 12:16 pm
Location: United States
Motorcycle: '76 gl1000, '81 gl1100, '86 gl1200A

Re: 1975 GL1000 idle questions

Post by Track T 2411 »

I can't take a pic, but there are two washers on the spring side of the sync linkage, and the slot of the other side needs to go between them. It's a bit fiddly to get it together and easy to miss (been there, done that...).
Slow idle return can also be caused by sticky slides or throttle cables.
HaydenJ
Posts: 3
Joined: Mon Jun 10, 2024 7:37 pm
Location: Mount vernon wa
Motorcycle: 1975 GL1000

Re: 1975 GL1000 idle questions

Post by HaydenJ »

Thank you!

I will check on sticky slides, I read I can use a mirror to check in the plenum while the bike is running. Also there is 2 springs on the adjusters, does it go spring, washer, slotted bracket, washer, spring, then threaded hole?
Track T 2411
Posts: 36
Joined: Sat Mar 05, 2022 12:16 pm
Location: United States
Motorcycle: '76 gl1000, '81 gl1100, '86 gl1200A

Re: 1975 GL1000 idle questions

Post by Track T 2411 »

HaydenJ wrote: Tue Jun 11, 2024 12:13 pm Thank you!

I will check on sticky slides, I read I can use a mirror to check in the plenum while the bike is running. Also there is 2 springs on the adjusters, does it go spring, washer, slotted bracket, washer, spring, then threaded hole?
Yes, between the washers...
I'm not sure if one would be able to really tell if one or more of the slides are sticking with the engine running; never tried it that way. I have pulled an intake elbow and used a shop vac with a mirror in the plenum. More work but I would think more accurate?
HaydenJ
Posts: 3
Joined: Mon Jun 10, 2024 7:37 pm
Location: Mount vernon wa
Motorcycle: 1975 GL1000

Re: 1975 GL1000 idle questions

Post by HaydenJ »

Well, upon further looking I pulled my carbs to make sure I got everything right. I polished slides and plan to set float bowl levels, and bench set the synch...
However while inspecting I noticed that my left carbs and right carbs have different jets... the pilot jets on the carbs 1 and 3 say 65 (if memory serves me right) and the 2 and 4 are unmarked... I used small drill bits to test size all 4 seem to be .025 in or .6mm
The main jets on the 1 and 3 say 125 whilst the 2 and 4 say 120

I don't think they should be mismatched... my question on this is what size ought they be?

Also what should I do to the carbs before reinstalling so that I can synchro and go?
Track T 2411
Posts: 36
Joined: Sat Mar 05, 2022 12:16 pm
Location: United States
Motorcycle: '76 gl1000, '81 gl1100, '86 gl1200A

Re: 1975 GL1000 idle questions

Post by Track T 2411 »

I'm not a 1000 carb expert, but here's a link to some info... https://www.randakksblog.com/air-jet-mix-up-problem/
Another thing you may want to check is that all four carb bodies are the same. Each year of the 1000's carbs are different, and so are the jets used.

I must be having a bad 'search' day because I know there's a chart or two out there with all this info listed...
Track T 2411
Posts: 36
Joined: Sat Mar 05, 2022 12:16 pm
Location: United States
Motorcycle: '76 gl1000, '81 gl1100, '86 gl1200A

Re: 1975 GL1000 idle questions

Post by Track T 2411 »



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