'76 Acceptable idle RPM?


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hansolo8
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'76 Acceptable idle RPM?

Post by hansolo8 » Sat Aug 31, 2019 11:40 pm



Hey guys, so if you remember me from previous posts,
I have 76 Wing that had high idle hang-ups and intermittent engine stalls.

It turns out, the dog-bone fuse was too old causing stalls and vacuum ports were not sealed properly and it was getting false air causing the bike to hang up if I set the idle speed anything above 1000 RPMs.


Now I have fixed that issue by replacing the dog-bone fuse, re-adjusting the idle mixture, giving a really good sync with DigiSync tool and properly sealing the vacuum ports.



I originally had the idle mixture screws at 2.5 turns out, but I noticed the RPM dropping too fast and dipping below 500 RPMs, so I set the screws at 2 turns out.
Now the RPM drops to idle at a reasonable response speed, and I had the idle RPM set at 950 RPM.
But I noticed it dying at idle if I didn't give it a good rev at stop lights.


So I increased the idle to about 1200 RPMs when running at operating temperature.
Now the bike doesn't die at stop lights, and now the vacuum ports have been properly sealed, I no longer get false air that causes the bike to hang up, and I feel like 1200 RPM idle doesn't really mess with shifting either.

But it is quite a bit off from the specs specified in the manual and I was wondering if (from you guys's anecdotal experiences) it is acceptable to have it idle +26% than spec idle settings.
Any input would be appreciated.
Thanks

P.S

Also, I have noticed one of the carbs going out of sync after a few weeks of riding. Is this pretty normal? It's usually the #2 carb that goes out of sync


Last edited by hansolo8 on Sun Sep 01, 2019 4:17 am, edited 1 time in total.

Old Fogey
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Re: '76 Acceptable idle RPM?

Post by Old Fogey » Sun Sep 01, 2019 3:20 am

It sounds like your idle circuits are needing attention, probably the internal seals too. Assuming you have the correct 758 '76 carbs, idle screw is 2 turns out. But if the carbs have been swapped out that may not be correct (755 only need 1 1/3). Idle speed should be 950 - 1000.
'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

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hansolo8
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Location: Mesa Arizona
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Re: '76 Acceptable idle RPM?

Post by hansolo8 » Sun Sep 01, 2019 4:17 am

Old Fogey wrote:
Sun Sep 01, 2019 3:20 am
It sounds like your idle circuits are needing attention, probably the internal seals too. Assuming you have the correct 758 '76 carbs, idle screw is 2 turns out. But if the carbs have been swapped out that may not be correct (755 only need 1 1/3). Idle speed should be 950 - 1000.
Thanks for the response.
How will I be able to check whether they have been swapped or not?
Although I dont think this is the case as even 2 turns out feel a little bit too lean

Old Fogey
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Re: '76 Acceptable idle RPM?

Post by Old Fogey » Sun Sep 01, 2019 5:32 am

On the carb mounting flange where it bolts to the plenum there will be a stamped number 758A, 755A etc.
'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

( Seriously, you haven't read all 115 pages of my http://www.wingovations.com website ?? :shock: )

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Re: '76 Acceptable idle RPM?

Post by dingdong » Wed Sep 04, 2019 7:47 am

Once the sync is set on a properly cleaned and tuned set of carbs the sync should not change at all. I also think your carbs need more attention.
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flyday58
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Re: '76 Acceptable idle RPM?

Post by flyday58 » Sun Sep 08, 2019 11:26 am

Han, one of my GLs came to me with 1100 carbs on it. Being new to the GL world if someone hadn't pointed it out, I would have chased issues for a while before figuring out the deal. Unless you're sure, a quick pic post here will let us see what you have installed. Just a thought.


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