Having a close look at my carb


Information and questions on GL1500 Goldwings (1988-2000)
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GillesGLW
Posts: 102
Joined: Fri Mar 20, 2015 6:52 am
Location: Switzerland
Motorcycle: 1989 GL 1500

Having a close look at my carb

Postby GillesGLW » Sun Oct 18, 2015 9:35 am



Hi Everyone,

As winter is coming here in Switzerland, I plan to have a close look at my carb during the next months. The bike is 26 years old and runs fine, but I feel it has some difficulties between 1500 and 2000 rpm. The trigger wheel helped a lot but still it's not as smooth as it should be.

As I have no idea when the carbs have been cleaned the last time, I would like to have a close look at them and all the hoses around, to make sure they are in good shape for the next riding season.

I read a lot of things on this forum. Some people are cleaning the carbs, some are "re-jetting" them. Is there something I should consider to do? Something that Honda engineers didn't think about?

I'm not clear on this "re-jetting" thing, in particular how you fine tune your carbs after that. My idea was simply to clean them and hope that the bike will run a bit smoother.

What would you recommend?

Thanks,
Gilles



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virgilmobile
Posts: 7663
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: Having a close look at my carb

Postby virgilmobile » Sun Oct 18, 2015 10:29 am

I'm looking at this on my phone and do not know the year of the bike.Math says its a 89.If correct,has it had the factory recall modification done for drivability issues?
Generally,poor performance in the 1500 range can be eliminated by lifting the slides a few mm with a "Large O ring" attached to the slide.

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ct1500
Posts: 813
Joined: Wed Nov 10, 2010 8:09 pm
Location: Glastonbury,CT
Motorcycle: 1988 GL1500
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Re: Having a close look at my carb

Postby ct1500 » Sun Oct 18, 2015 6:11 pm

GillesGLW wrote:The bike is 26 years old and runs fine, but I feel it has some difficulties between 1500 and 2000 rpm. Some people are cleaning the carbs, some are "re-jetting" them. Is there something I should consider to do? Something that Honda engineers didn't think about? I'm not clear on this "re-jetting" thing, in particular how you fine tune your carbs after that. My idea was simply to clean them and hope that the bike will run a bit smoother. What would you recommend?


Only the 1988 year had an off idle hesitation and Honda did a service campaign to repair it which included installing larger pilot jets, the '89 model year was not affected.

Pilot jets are not causing your problem between 1500-2000RPM so re-jetting would not be advisable.

What I would recommend is studying all you can about carbs and their operation then diagnose to determine what part/system has failed whether it be slides, vacuum leaks, etc. to return the bike to its' original factory specifications.
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

GillesGLW
Posts: 102
Joined: Fri Mar 20, 2015 6:52 am
Location: Switzerland
Motorcycle: 1989 GL 1500

Re: Having a close look at my carb

Postby GillesGLW » Mon Oct 19, 2015 4:12 am

Hi Everyone,

Thanks for your replies. That's correct the bike is an 1989 model. What I'm not sure about is if the service campaign has been done on the bike or not.

For sure the trigger wheel did help a lot, but I read that if the setup of the carb is correctly done, a trigger wheel is not required. Not sure how this can be done if you are not a Honda specialist.
I will un-mount the carb for sure and have a look at the hoses. They are probably 26 years old as well, so a replacement might be required (anyway, once the carb are out of the bike, changing the hoses will not be a big thing).

By chance, would you know what should be the size of the jets? I will then be able to see if the service campaign has been done or not.

Thanks!
Gilles

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spiralout
Posts: 1050
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Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: Having a close look at my carb

Postby spiralout » Mon Oct 19, 2015 10:29 am

GillesGLW wrote:By chance, would you know what should be the size of the jets? I will then be able to see if the service campaign has been done or not.

The fix replaced the originals with #55 slow jets. You can probably tell by the hose routing, too. Here are the SBs
http://www.gwrraiachapa.com/bulletins/1500SB1.pdf
http://www.gwrraiachapa.com/bulletins/1500SB2.pdf

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ct1500
Posts: 813
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Location: Glastonbury,CT
Motorcycle: 1988 GL1500
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Re: Having a close look at my carb

Postby ct1500 » Mon Oct 19, 2015 7:14 pm

GillesGLW wrote:Thanks for your replies. That's correct the bike is an 1989 model. What I'm not sure about is if the service campaign has been done on the bike or not.
By chance, would you know what should be the size of the jets? I will then be able to see if the service campaign has been done or not.


As I wrote earlier and as shown in the Service Bulletin your 1989 model was not included for the off idle hesitation and which would have nothing to do with your current problem at 2k RPM.

Your 1989 when delivered new off the showroom floor would have run great just like any other 1500 built after it. :)

Normal wear and tear along with the passage of time has taken a toll somewhere in the components.
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

GillesGLW
Posts: 102
Joined: Fri Mar 20, 2015 6:52 am
Location: Switzerland
Motorcycle: 1989 GL 1500

Re: Having a close look at my carb

Postby GillesGLW » Tue Oct 20, 2015 3:32 am

Thanks for the info.

The bulletin says about an "metal air vent pipe" and I dont' remember having seen it. Most probably my bike didn't get the recall.

Have you ever seen a kind of "hose pack" on the market like they do for gaskets? Once I will have the carb out of the bike, I think I can replace them all and forget about them for 26 more years! :)

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RBGERSON
Posts: 2625
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Having a close look at my carb

Postby RBGERSON » Fri Oct 23, 2015 2:47 pm

take lots of pics and try to label the hoses and their ports before you tear into it..getting all the hoses back in the right spot can be difficult from memory


HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB


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