sluggish when accelerating at higher rpm


Information and questions on GL1500 Goldwings (1988-2000)
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B_knight2009
Posts: 4
Joined: Wed Sep 16, 2009 10:08 pm
Location: Rock Island, IL
Motorcycle: 1994 GL1500A Aspencade

sluggish when accelerating at higher rpm

Postby B_knight2009 » Sat Jun 02, 2012 11:31 pm



Hi all, its riding weather here in Illinois :-). I have a 1994 1500 Aspencade and have a question regarding regarding sluggish acceleration at higher speeds (quite noticeable starting around 40mph). Just before last winter I noticed the problem. I removed the air filter and in looking down at the carb I can see that there is a sleeve that slides to the side down in the carb throat but not the other. Are they both suppose to move at the same time not giving me enough fuel when accelerating? When riding I can get it to accelerate when merging onto the highway if I push down on the choke. Is this a easy fix? Thanks in advance



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

Re: sluggish when accelerating at higher rpm

Postby virgilmobile » Sun Jun 03, 2012 12:56 am

I hope your carbs are the same as my 88.
As i look down into the bowles of the carbs,the first thing I see are 2 round black slides that travel toward the center.
Each one is independent and air flow operated.They must be closed at a idle and should rise as the rpm/air flow increases.
When i snap the throttle from a idle,mine will jump a bit but not slam wide open.This is normal.
I had to remove my carbs(a horrible job)...clean and polish everything to get it loosened up again.
If your slides are sticking,a bit of crud may have them caught and some spray could loosen them up.
gently work them outward and they should slide right back.

B_knight2009
Posts: 4
Joined: Wed Sep 16, 2009 10:08 pm
Location: Rock Island, IL
Motorcycle: 1994 GL1500A Aspencade

Re: sluggish when accelerating at higher rpm

Postby B_knight2009 » Sun Jun 03, 2012 7:27 am

Virgilmobile, when you snap your throttle do both of them slide some? Only one slides when I do it. The other one does not appear to be stuck. When I manually move it It freely and returns. I have sprayed seafoam in hopes to clean any particles that may be hampering the movement. Since it operates by air flow is there a hose that may be plugged or came off

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virgilmobile
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83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: sluggish when accelerating at higher rpm

Postby virgilmobile » Sun Jun 03, 2012 10:04 am

When I quick snap the throttle,both will jump a bit.Obviously the faster the engine is revved to the further open they will go.

The slide moves when air passes across the bottom part.There is a small hole in it.When the air flows past it,it tries to suck the air out of the slide chamber..Kinda like a paint sprayer.
As the vacuum builds up,the slide retracts into the cap.It's sealed by a rubber diaphragm.
SO....If you don't have slide movement that's equal and the slide is NOT stuck,the most likely cause is a hole or tear in the diaphragm.

It is possible that on the 1500 that there are vacuum hoses that MAY influence the slide operation and I have found 7 hoses that were impending failing on mine.Each was at a sharp 90* bend.

I guess the first step is to verify the slides move freely with the engine off and that they are not responding well.
From there look at as many hoses you can see.Especially the 4 connected to the manifold,next to the spark plugs.There are 2 on each side.
After that you'll have to pull the carbs to get to the rest of it.

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robb
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Re: sluggish when accelerating at higher rpm

Postby robb » Sun Jun 03, 2012 12:57 pm

I repaired the 90* bends and one cracked a few months later so don't overlook. Have you checked the fuel filter as it will show up best at high speed.

B_knight2009
Posts: 4
Joined: Wed Sep 16, 2009 10:08 pm
Location: Rock Island, IL
Motorcycle: 1994 GL1500A Aspencade

Re: sluggish when accelerating at higher rpm

Postby B_knight2009 » Sun Jun 03, 2012 3:51 pm

thanks for the input virgil & rob. I will check the fuel filter (though I don't think the problem is there. That I changed last year) I'll also check all hoses especially the 90 degree ones.

Considering when I push down / open the choke I would accelerate quicker have anthing to do with it?

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virgilmobile
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Joined: Sun Sep 19, 2010 5:39 pm
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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: sluggish when accelerating at higher rpm

Postby virgilmobile » Sun Jun 03, 2012 4:06 pm

It adds more fuel.bypassing a non moving slide which does the same thing as it opens up and extracts the needle from the main jet

B_knight2009
Posts: 4
Joined: Wed Sep 16, 2009 10:08 pm
Location: Rock Island, IL
Motorcycle: 1994 GL1500A Aspencade

Re: sluggish when accelerating at higher rpm

Postby B_knight2009 » Wed Jun 06, 2012 4:31 pm

I see. Thanks again.




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