GL1000 engine shutting down at lower speeds (while running warm)


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hansolo8
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GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Tue Dec 18, 2018 7:37 pm



Hello, I have a 1976 GL1000.
Because I mostly just wanted to ride than tinkering, I just brought the bike to a shop, got a quote for a complete carb overhaul, starter replacement, and fluids flush and went through with it.
I always wait about 5-10 min before riding so that the bike is at a good operating temperature or at least get through the blue line.
It rides fantastic now with only one problem mentioned in the title.
The problem comes and goes, sometimes I could be at a really crowded outdoor mall and frequently stop at intersections and it will still idle really nicely.
Other times, I finished my commute from my work to home and I'm braking to turn at the gate then the RPM drops down to 400 and engine dies (And sometimes, it'll kick back up to 1000 RPM and not die)
What's frustrating is I cannot duplicate this problem and the shop is not able to isolate where the issue is.
If anyone has a good insight on what the issue might be, I'd really appreciate it.
Thank you
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DaveO430
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by DaveO430 » Tue Dec 18, 2018 7:53 pm

It may be the air cutoff valve is sometimes not opening after deceleration.

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SnoBrdr
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by SnoBrdr » Tue Dec 18, 2018 9:20 pm

Does this have points or an aftermarket ignition setup?

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hansolo8
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Tue Dec 18, 2018 9:27 pm

SnoBrdr wrote:
Tue Dec 18, 2018 9:20 pm
Does this have points or an aftermarket ignition setup?
It has points. The mechanic at the shop said he did static timing on it as best as he could
Is digital ignition something to consider for an issue like this?

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SnoBrdr
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by SnoBrdr » Tue Dec 18, 2018 9:34 pm

hansolo8 wrote:
Tue Dec 18, 2018 9:27 pm
SnoBrdr wrote:
Tue Dec 18, 2018 9:20 pm
Does this have points or an aftermarket ignition setup?
It has points. The mechanic at the shop said he did static timing on it as best as he could
Is digital ignition something to consider for an issue like this?
Not really.

Why I asked was my 1st electronic ignition went bad, after 36 years.
It would do as you described, but since you don't have that, it can't be the issue.

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hansolo8
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Tue Dec 18, 2018 9:38 pm

DaveO430 wrote:
Tue Dec 18, 2018 7:53 pm
It may be the air cutoff valve is sometimes not opening after deceleration.
Prior to taking it into the shop, stalling upon deceleration was so frequent and was easy to duplicate. Everytime I accelerate up to 50mph and brake really hard with the clutch pulled in while running warm, engine would stall.

So the cut-off valve was one of the first things that the shop went through during the overhaul. So I don't think it's the culprit.

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by Aussie81Interstate » Tue Dec 18, 2018 9:43 pm

Do you think it could be stuck throttle cables when you go around a corner ??

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by cfairweather » Sat Dec 22, 2018 7:32 am

Even if the the points and timing are not part of this issue, I recommend going with Dyna 3 ohm coils and electronic ignition. I would make sure the all four idle discharge ports are open by removing the idle jet screws and shooting a little carb cleaner in the holes followed by high pressure air. These tubes are sometimes overlooked by mechanics during the rebuild process. Make sure the idle screws are set correctly. Make sure the valves are set correctly because having them too tight can contribute to this issue.

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by terryt » Thu Dec 27, 2018 5:28 am

First I would re check the point gap then the static timing. also check to see if air is being sucked in around the carb manifolds at the cylinder head and carb body

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by Fred Camper » Tue Jan 01, 2019 1:15 pm

Sure seems to me the carburetor sliders are getting stuck. The sliders in each carb need to slide like silk, no effort to move. Any small amount of stick can cause them to hang up (they are open at 50 mph, closed at idle). Many shops may not understand how smooth they need to slide. Absolutely no lub on them to silky side is essential.

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by Bugeyz » Tue Jan 15, 2019 2:41 pm

I hope your issue was resolved but if not perhaps you may want to look at your electrical system with a focus on the connection on your battery, making sure you have good contact. Good luck and let us know if you got it fixed.

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Sun Jan 27, 2019 1:27 am

I think I found out what the problem is.
It looks like low-idle + clutch problem.
I noticed that the clutch does not fully disengage when the bike is running hot.
And the idle does not seem to be high enough to keep the engine running when the clutch is tiny bit engaged.
I also have a recording of a video.
I can kind of duplicate it now. It happens when the bike is running hot, at about 2500 RPMs in second gear about 30mph and I'm rolling off the thorttle pulling in the clutch to shift down. The engine starts to sound weak and shuts down.
Could it be the coasting speed is too slow while the clutch is a little bit engaged and it's causing the bike to stall?

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by cfairweather » Sun Jan 27, 2019 9:16 am

Do the same test except downshift into neutral instead of first. If it still dies, the clutch has nothing to do with the problem.

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hansolo8
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Sun Jan 27, 2019 2:15 pm

cfairweather wrote:
Sun Jan 27, 2019 9:16 am
Do the same test except downshift into neutral instead of first. If it still dies, the clutch has nothing to do with the problem.
Tried it just now. Repeated it for about an hours at a parking lot. Doesn't happen when I shift down to neutral.

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by WingAdmin » Mon Jan 28, 2019 8:53 am

hansolo8 wrote:
Sun Jan 27, 2019 2:15 pm
cfairweather wrote:
Sun Jan 27, 2019 9:16 am
Do the same test except downshift into neutral instead of first. If it still dies, the clutch has nothing to do with the problem.
Tried it just now. Repeated it for about an hours at a parking lot. Doesn't happen when I shift down to neutral.
Sounds like you've nailed it, then. Have you tried adjusting your clutch out a bit? It could be nothing more than a clutch cable that's stretched a little bit.

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hansolo8
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Sat Feb 02, 2019 11:13 pm

WingAdmin wrote:
Mon Jan 28, 2019 8:53 am
hansolo8 wrote:
Sun Jan 27, 2019 2:15 pm
cfairweather wrote:
Sun Jan 27, 2019 9:16 am
Do the same test except downshift into neutral instead of first. If it still dies, the clutch has nothing to do with the problem.
Tried it just now. Repeated it for about an hours at a parking lot. Doesn't happen when I shift down to neutral.
Sounds like you've nailed it, then. Have you tried adjusting your clutch out a bit? It could be nothing more than a clutch cable that's stretched a little bit.
Seems like this wasn't it.
Clutch is fully repaired
The issue is haunting me again.
The mechanic drove it around for like an hour and couldn't make it happen.
But I drove it around, and it doesn't happen when I'm smoothly accelerating or shifting gears at higher speeds.
But as soon as I step on that rear brake, and the brake light comes on. It happens.
Doesn't always happen though. I'm not sure how to duplicate the issue.
I'm not a super experienced rider, but I know how a clutch works and this is my third bike, so I definitely know it's not the way I operate it that's causing this.
Could it be either the dogbone fuse or the slider?
Oh, and one other thing that I noticed was that once the random stalling does happen, it becomes pretty hard to start the bike back up again even though the bike is running warm. I either have to crack the throttle or apply choke to get it running again.

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by flyday58 » Sun Feb 03, 2019 12:18 am

So to be clear, this is only happening when you apply the rear brake, not the front? What about accelerating to 50, pulling in the clutch and just coasting? What about easing on the rear brake has opposed to hitting it hard? I'm curious if there's adifference in there that could help you pin this down.
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hansolo8
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Sun Feb 03, 2019 12:24 am

flyday58 wrote:
Sun Feb 03, 2019 12:18 am
So to be clear, this is only happening when you apply the rear brake, not the front? What about accelerating to 50, pulling in the clutch and just coasting? What about easing on the rear brake has opposed to hitting it hard? I'm curious if there's adifference in there that could help you pin this down.
I always use both brakes.
But the mechanic thought I was some how rolling the throttle to the front when applying the front brakes and causing the bike to stall so I tried using only rear brakes and the same thing happened.
Accelerating to 50 and pulling in the clutch used to cause the bike to stall when I first took it to the shop but it was fixed when the carbs were rebuilt and rebalanced.
The problem seems to occur when I gently apply the brakes to slow down in corners at very slow speeds. Like going into my apartment's gate and turning left. Or navigating around parking lots.

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by flyday58 » Sun Feb 03, 2019 12:32 am

Any idea where your mechanic set the idle air screws?
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hansolo8
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Sun Feb 03, 2019 12:35 am

flyday58 wrote:
Sun Feb 03, 2019 12:32 am
Any idea where your mechanic set the idle air screws?
I'm not sure what you mean. You mean the idle RPM?

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by flyday58 » Sun Feb 03, 2019 12:42 am




The lowest arrow in this photo courtesy of Randakk's. Labeled 'fuel idle mixture screw'.
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Sun Feb 03, 2019 12:50 am

flyday58 wrote:
Sun Feb 03, 2019 12:42 am
gl1000master_location.jpg
The lowest arrow in this photo courtesy of Randakk's. Labeled 'fuel idle mixture screw'.
Oh, I'm not so sure. I left the bike at the shop so I'll have to check with him.
But I'm guessing this is different from the idle speed adjustment screw? (It's kind of hard to tell with the engine disassembled out of context from the motorcycle frame).

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by flyday58 » Sun Feb 03, 2019 1:00 am

Yes, different. There's just one idle SPEED screw, but there are four idle MIXTURE screws, one on each carb body, underneath the bracket that has the clip to hold the spark plug wires. They control the amount of gas going to the motor at idle when the throttle is fully closed. More turns out equals more gas at idle. I have a CB750 that had the screws turned in too much and it had a similar dying problem when warmed up.
Best explanation here: https://www.motorcycleproject.com/index.html#100
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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by hansolo8 » Tue Feb 05, 2019 2:36 am

[youtube]

[/YouTube]

Here's the video of the bike shutting down.
One thing I noticed was that fan did not come on even when it was hot
And it was hard to start it back up even though it's been getting constant fuel flow for driving for about 15 minutes and the engine was hot.
Don't mind the first couple of failed starts. The clutch switch is kind of finicky on my bike. So I had to put it to neutral.

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Re: GL1000 engine shutting down at lower speeds (while running warm)

Post by DenverWinger » Tue Feb 05, 2019 7:00 am

I'm kinda leaning toward agreement with Flyday's idea...

Does the exhaust smell rich with engine idling? If not, I'd try screwing out the four idle mixture adjustments a half-turn each and see what that does. If you turn them exactly a half-turn, you could always put them back, or try a full turn, too.


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