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Discussion Starter · #1 ·
I have a new-to-me 1988 Gl1500 that has the famous hesitation problem. I had another 1988 GL1500 many years ago and it had the same issue. Back then Honda offered a kit to fix it. I installed the kit in my first '88 and all was good.

For this bike, I ordered the 55 slow jet and a gasket set. I went through the carbs and noticed the slow jet was already a 55 but the carb control unit was the old version. Also, no X was stamped on the frame as per Honda's service bulletin. Obviously someone had been in there before trying to fix the problem.

I cleaned the carbs, checked everything, installed the new 55 jets and synched them. The hesitation was still there. I pulled them 2 more times and took them apart looking for a clogged passage or anything, no luck.

I found a set of carbs off a low-mileage '95 bike on eBay and bought them. There are few differences like a third cable connection to the throttle linkage. It looks like they will work without that 3rd cable my '88 does not have.

The big question is the vacuum lines. The '88 carbs have a total of 4 vacuum lines leaving the carbs and connecting to 2 air injection valves (hose #18 & 19). The other two hoses connect to the air valve controller (hose #16 & 17). Both the air injection and control valves are under the right fairing pocket.

The 1995 carbs have rigid plumbing with a total of 2 vacuum lines leaving the carbs. Comparing the two I see that the 2 lines on the '95 carbs match the lines going to the air injection valves (hose #18 &19).

Has anyone made this swap? If so, what did you do with the air injection controller that is supposed to have 2 vacuum lines?. Also on the '95 carb there is another line (pink) that is connected to the throttle body. Where does that one go?

Thanks.
 

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Discussion Starter · #3 ·
I did a little more checking.

The #16 & 17 hoses come from each carb (one from each) and go to the control valve. There are no other connections on the control valve so I assume that leaving it disconnected should be OK.
 

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Discussion Starter · #4 ·
I found this:

There is a thread on the subject in the A to Z tech section. Look under "C" for carb swap from a 95 to an 88.

But I can't find an A-Z tech section......
 

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Piaggio MP3, was 02 GL1800
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I found this:

There is a thread on the subject in the A to Z tech section. Look under "C" for carb swap from a 95 to an 88.

But I can't find an A-Z tech section......

The A-Z Tech Links has not been installed in our new software yet. It is being looked at though. It was full of links and is one of the last addons for the vB from the old they had to do.

This link is for the 88-89 carbs, it is a video.



This link is photos of the 1500 carbs by Rudy
http://goldwingtech.info/carbpix/carbshots1.htm

this is the carb removal link for the 88-89
http://www.goldwingfacts.com/forums...33324-89-1500-carburetor-removal-rebuild.html


This is the jet replacement link
http://www.goldwingfacts.com/forums/2-goldwing-technical-forum/356541-1500-jet-replacement.html


This is a parts fiche link
http://www.cheapcycleparts.com/mode...1-gold-wing-aspencade-GL1500A/assemblies/8320

88 Off Idle Hesitation, Recall, Carb. 'Upgrade' Parts, Trigger Wheel..
http://www.goldwingfacts.com/forums...-recall-carb-upgrade-parts-trigger-wheel.html


Balancing GL1500 Carburettors
http://www.goldwingfacts.com/1500balancecarbs.htm


Fuel and Carb woes, GL1500. Humbling pics inside!
http://www.goldwingfacts.com/forums...el-carb-woes-gl1500-humbling-pics-inside.html





Randakks carb parts page
http://www.randakks.com/GL1500%20Page.htm



Setting float height
http://www.goldwingfacts.com/forums/2-goldwing-technical-forum/358662-ok-here-we-go-carbs.html


None of these links specifically addresses by title the question you have. I have just spent an hour looking through my bookmarks and don't have one 'titled' upgrade from 88 or 89 carbs to a later year model. Yet we have had many threads on that same subject.
That is usually a direct result of our thread titles not being precisely correct as to what we want when we start a thread.

 

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88's are the only year that used the altitude compensator. Ttiger, that is the component in front of the right fairing pocket. There will be no vent lines on the 96 carbs to accomodate it. I don't see why you couldn't just leave it disconnected like 51cruzr did.
 

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I thought the stumble was fixed by changing the trigger on the front crank..pushing it 4* higher????
 

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I thought the stumble was fixed by changing the trigger on the front crank..pushing it 4* higher????
The 4° trigger wheel doesn't do much to improve the stumble on most bikes from what I am seeing here on this forum. Some owners seem to think it helped some (maybe a placebo effect) but most say it didn't do anything except make you have to buy premium fuel. The recall from Honda to fix the stumble included slow jets, jet needles, ignition control units and some other pieces and adjustments to fix the trouble.
 

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Discussion Starter · #10 ·
I connected everything and the bike started right up. I ended up leaving that control box (altitude compensator) disconnected but did connect to the two air control valves. After letting it warm up it seems like the hesitation is gone.

The pink vac line from the throttle body looks like it goes to the hot air flapper valve. On the '88 that valve already gets its vacuum from another source so I left that hose off and capped the port.

I don't have a '95 service manual, but my '88 manual and subsequent service bulletin says to go two turns out on the pilot jets to start.

Can someone with a '95 manual look and see where they should be on '95 carbs as a starting point? I'm going to try the idle drop adjustment but would like a starting point.

Also, if you could scan the vacuum hose routing diagram from the '95 manual and send it to me It would be a great help

Thanks

Thanks
 

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Honda mixture screws are traditionally set too lean IMO...I usually start around 3 turns out and set them by ear after a test ride.
 

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Discussion Starter · #12 ·
Found a PDF of the '95 manual. All good
 
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