GL1500 surge issue. - Page 2 - Steve Saunders Goldwing Forums

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post #11 of 36 (permalink) Old 05-19-2017, 07:13 AM
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Originally Posted by gumbyred View Post
I have noticed if the idle is set too high you can get a surge in R.P,M.while riding also was what I was getting at. Especially if you are trying to compensate for plugged jets. I just used the idle speed of 750-775 R.P.M.s as proof that the carburetors are clean and pretty well balanced. Set it at what you need to keep battery charged.
Correct me if I`m wrong, but that knob seems to control only one carburetor. At around 775 I hit what I call the "sweet spot" for idle. (What was the cause of the surge gford?)
gumbyred

The idle knob turns a cable that is connected to the left carb but both carbs will move because of the shaft linkage between them.

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post #12 of 36 (permalink) Old 05-19-2017, 08:53 AM
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What did you so to solve it?
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post #13 of 36 (permalink) Old 05-19-2017, 09:09 AM
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What did you so to solve it?
It's a link, click on the highlighted text.

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post #14 of 36 (permalink) Old 05-19-2017, 09:12 AM
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At what R.P.M. does the bike idle at? Any surge at idle? You should be able to turn the adjuster knob to the right, and just ahead of gas cap. I find that if bike idles at 750 R.P.M. to 775 by turning this knob, the carbs are pretty well synced. If it won`t idle at this speed, there may be carburetor jet blockage, so long as there is no vacuum leakage, new plugs and filters.
gumbyred
Synchronization and blocked jets are NOT related, neither is idle speed and a surge when riding.

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post #15 of 36 (permalink) Old 05-19-2017, 08:50 PM Thread Starter
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What did you so to solve it?
He replaced a part.
GL1500, found under “Water Pipe”, #22, Sensor, coolant temp part #36151-MT8-003

I seen this thread a long time ago. I am searching for answers before asking.


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post #16 of 36 (permalink) Old 05-19-2017, 09:02 PM Thread Starter
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Everyone seems to be stuck on idle surging, that is not the problem. It is at any speed and in any gear.

Neither of us have had the 90 degree pipe replaced under the carburetor. I have sprayed carburetor cleaner at that tube using the extended red tube for direct direction. The bike does not change RPMs and that tells me his is good.

IDLE?
His 900, mine 750. Both our bikes are charging around 12.8 to 13.2 with headlights on bright.


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post #17 of 36 (permalink) Old 05-20-2017, 12:42 AM
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Everyone seems to be stuck on idle surging, that is not the problem. It is at any speed and in any gear.

Neither of us have had the 90 degree pipe replaced under the carburetor. I have sprayed carburetor cleaner at that tube using the extended red tube for direct direction. The bike does not change RPMs and that tells me his is good.

IDLE?
His 900, mine 750. Both our bikes are charging around 12.8 to 13.2 with headlights on bright.
I think that method will not work on this tube. Because we are talking about a collapsed tube, not a broken one.
The picture may help.

Also watch this video about a similar problem, which was found to be the orange tube was collapsing on high vacuum. And note that, that orange tube goes to ECU for ignition timing.
Attached Images
File Type: jpg File 2.11.2016 19 58 29.jpg (91.6 KB, 20 views)
File Type: jpg image.jpg (135.9 KB, 17 views)

Last edited by Erdeniz Umman; 05-20-2017 at 01:17 AM.
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post #18 of 36 (permalink) Old 05-20-2017, 04:36 AM
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It's a link, click on the highlighted text.
Thanks. I didn't realize it was a link.
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post #19 of 36 (permalink) Old 05-20-2017, 08:05 AM
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Neither of us have had the 90 degree pipe replaced under the carburetor. I have sprayed carburetor cleaner at that tube using the extended red tube for direct direction. The bike does not change RPMs and that tells me his is good
Not really unless tested for correctly. That vacuum hose is under the rubber mat and there is no way the plastic straw can reach into that general area which must be accessed from the spark plug/wire region.

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post #20 of 36 (permalink) Old 05-24-2017, 01:25 PM Thread Starter
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We switched bikes and rode. I can tell you it is nothing like any one here is saying about surging. Although I didn't pull the clutch in at speed, maybe I should have.
What his bike feels like is (for say but happens in any speed) 2500 RPM in 5th gear and riding constant speed. His bike does not spark plug miss, they are all firing properly. There is a random momentary acceleration, it is as if a few couple extra cylinders were firing.
IF I may be so indignant to say it this way, you are riding along and you feel the momentary 'Jet Pulse' from your fart.


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