GL1500 Carbs.


Information and questions on GL1500 Goldwings (1988-2000)
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john pasterjak
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Location: ormond beach fl 32174
Motorcycle: 1988 GL 1500

GL1500 Carbs.

Postby john pasterjak » Wed Apr 03, 2013 2:34 pm



My latest effort to solve my stumbling problem during quick opening of the throttle was to re-build the acceleration pump with a new diaphragm. It didn't solve the problem. The Bike really seems to be starving for gas. Should the fuel filter be full of gas during normal operation?. Mine appears to be be about half full when the bike is running. All comments are welcome.



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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
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Re: GL1500 Carbs.

Postby WingAdmin » Wed Apr 03, 2013 5:31 pm

john pasterjak wrote:My latest effort to solve my stumbling problem during quick opening of the throttle was to re-build the acceleration pump with a new diaphragm. It didn't solve the problem. The Bike really seems to be starving for gas. Should the fuel filter be full of gas during normal operation?. Mine appears to be be about half full when the bike is running. All comments are welcome.


Mine looks about half full during normal operation as well.

Virgil fought (and won) this fight with his GL1500, he may have some more to comment.

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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1500 Carbs.

Postby virgilmobile » Wed Apr 03, 2013 9:09 pm

yes I did win.I can let out the clutch out at a idle and crack the throttle, watch the rpm. go to red line like a rocket.

I also did the same things you are doing.One step at a time.

First,did rebuilding the accelerator pump now provide a squirt of fuel as soon as you crack the throttle????

Mine does now by adjusting the control arm for a minus 0.10".
Meaning the accelerator pump arm now moves as soon as the throttle is moved.
Second,If this didn't completely fix the stutter,the next try is a bit unusual....Here goes...

take out the air filter...Use a piece of stiff wire under any screw and adjust it so it will prop open the slide about 3/16"...6mm...both slides/carbs.
put the air cleaner back and test again.
I did have a post about this.Mine added a bit more air for the engine.
I ended up putting a "O" ring on the slide to prop it up a little.
It had new affect on the upper rpm's or the fuel mileage.

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2manywings
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Re: GL1500 Carbs.

Postby 2manywings » Sun Apr 14, 2013 8:13 pm

The early 1500s were known for the off idle hesitation. I believe there was even a recall which involved some jet size changes. Just do a search for "GL1500 off idle hesitation" and you'll get all the info. I worked on two different ones last year with the same issues. Did total rebuilds on both and on both found small holes in the rubber slide diaphragms. Had to look really close to find them. replaced with new, and no more problem. Good luck!

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virgilmobile
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Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1500 Carbs.

Postby virgilmobile » Mon Apr 15, 2013 7:12 am

This is the reason when this problem exists,the DIY needs to attack it one step at a time.
The symptom may have different causes.
My 88 had the same hesitation but was related to fuel flow.The diaphragms were perfect.
It seems each one can be different.I happen to get the worst case scenario.

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virgilmobile
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Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1500 Carbs.

Postby virgilmobile » Mon Apr 15, 2013 3:55 pm

Maybe I should rephrase that....
Mine was bucking bad and had the original OEM 25 year old carbs that were never serviced by anyone and had no factory recalls done..
I had a hardened accelerator diaphragm
Leaking accelerator pump internals.
Leaking coupler tube "O" rings for the same.
Leaking and collapsing vacuum lines.
Leaking carb coupler rubbers.
Poor fuel mixture ratio at 1000 rpm and 2500 rpm range(which were changed by a larger idle jet and lifting the slide 6mm).
I also had to lower the float level by 2mm to compensate for the larger idle jet.
I left the timing original and did not op for the 4* trigger wheel.

I actually had 7 different fuel related problems,some OEM design,some age related....each thing I did improved the bike till finished.This took me 2 months part time to do.




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