Vacuum lines

Information and questions on GL1500 Goldwings (1988-2000)
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Motorcycle: 1988 gl1500

Vacuum lines

Post by wingthing88 » Fri May 06, 2016 10:57 am

Well I have about 60k on my baby ('88 1500) since I last cleaned the carbs and she starting to hessitate a little and my milage has dropped some so it's time to go through them again. I would like to replace all of the vac lines while I'm there is there anyone out there that knows the size or sizes I need and aprox feet so I can pre order a spool or two before I work on it? I've searched the site and haven't found the answer. Thanks.

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Re: Vacuum lines

Post by virgilmobile » Fri May 06, 2016 1:11 pm

Whew.As I remember I had the same problem.Fortunately I have a auto supplier near me that has a large supply of various vacuum lines on spools.I removed a couple and let them match them.I purchased 6' of each size.About $15 total.Ended up making a second trip for the oddball one.All and all it was a weekend project.
Don't forget the one under the black rubber mat and the smaller ones attached to the intake runners.

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Re: Vacuum lines

Post by RBGERSON » Fri May 06, 2016 5:50 pm

also using a barbed elbow instead of making the beds in the tight corners may serve you well..the Honda tubes are preformed..stock tubing is not and the tight 90* can crimp the tubes..


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Re: Vacuum lines

Post by Snowmoer » Fri May 06, 2016 10:14 pm

I do not remember the sizes, but the hoses are metric. I do remember that depending on what you want to replace, there were two sizes. Take a look at any on line parts place and look them up. It will list the size in the part discerption. I could not find a hose that fit right at the local parts stores. I got mine on Amazon in 10 foot lengths. I replaced all of them (carb and everything else) and used about 20'. Get the one that sits under the carb from Honda. It is formed and the bends are tight.

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Re: Vacuum lines

Post by GillesGLW » Sat May 07, 2016 11:20 am


I completed the overhaul of my carb just a month ago and I can tell you that you will need the following for the vaccum lines:
- 4 mm
- 5 mm
- 6 mm
- 8 mm

With the above dimensions, you should be able to change all the vaccum lines. For the lines that are bended, just make them a bit longer to avoid any issue.
I've also changed the rubber mat, it was quite expensive (about 120$ here in Switzerland).


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