Hunting idle, dead spot off idle - Page 3 - Steve Saunders Goldwing Forums

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post #21 of 24 (permalink) Old 04-17-2019, 10:58 AM
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Location: Anaheim, California, USA
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Quote:
Originally Posted by Jerry Burns View Post
The hose I'm talking about starts on the top of the left cylinder head and runs to the carb's if I remember right. If you pull the left side lower cover you will see it. I changed mine with the same hose from my old motor that I had, but that hose has to make a U turn and was made with that bend in it. I would buy OEM if I could find a new one. It's a good place to start looking for your Idle surge.

Similarly, on the right side of the bike (center cylinder, about an inch above the valve cover) is a screw... It's typically removed/replaced with a brass spigot when connecting a Mercury Carb Balancer.
Anyhow, if that screw (or the capped spigot) is missing/loose, then you'll get a vacuum leak there too.


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GL1500, 1990SE, 220k miles
Front: Bridgestone Battlax BT45, 41psi
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post #22 of 24 (permalink) Old 04-17-2019, 11:04 AM
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Year: 1988
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[QUOTE=ALEX BERECZKY;5835687]Gotta dis-agree on this one... A leak like this is above the carb, hence will not at all affect the fuel/air mixture that subsequently occurs downstream, after the air has passed through the carb. An air leak above the carb will only By-pass the air filter... which is bad, because you'd be drawing dirty air into the carb.

Sometimes ya gotta learn the hard way....
A guy comes into my shop, says he just bought his 1500 a couple of months ago. Had a chance to ride his buddy's 1500 and it accelerated MUCH better. So I test rode his bike and sure enough it was flat off idle and wouldn't accelerate till it was above 3k rpm. Long story made short... I found holes drilled in the top of the air box. 3 holes each the size of a silver dollar (if you remember those LOL).
Taped the holes and.... fixed.
Same airleak above the carb line caused the flat spot and poor acceleration and poor throttle response.
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88 GL1500
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post #23 of 24 (permalink) Old 04-18-2019, 06:10 PM
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I think you need to do the accelerator pump modification. That was the repair for the 88-89 hesitation issue.
The procedure was at one time in the archives here.
You can also google it.
There are 2 bypass ports that have to be plugged. It’s not a difficult job, but you must remove the carbs to do it.
You also need to add a .05 mm washer under the main needle, this greatly helps on the low speed needle to main needle transition.
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post #24 of 24 (permalink) Old 04-18-2019, 09:40 PM
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Quote:
Originally Posted by IDRC View Post
I think you need to do the accelerator pump modification. That was the repair for the 88-89 hesitation issue.
The procedure was at one time in the archives here.
You can also google it.
There are 2 bypass ports that have to be plugged. Itís not a difficult job, but you must remove the carbs to do it.
You also need to add a .05 mm washer under the main needle, this greatly helps on the low speed needle to main needle transition.

Obviously you didn't look at the attachments in post # 4. Its there.....!!!!!!

BTW.....It was only for the 1988 (not 1989).....!!!
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