1988 1500 Mystery Part


Information and questions on GL1500 Goldwings (1988-2000)
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dvcruz
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Location: San Jose, Ca
Motorcycle: 1993 GL1500 Aspencade
1983 GL1100 Interstate

1988 1500 Mystery Part

Postby dvcruz » Tue Dec 28, 2010 10:56 pm



Holiday Greetings to All.
My bro and I are killing time while waiting for some days of bad weather to pass by giving his 1988 1500 a good workover. The bike is running fine, we're just cleaning elecrical contacts, fixing plastic pieces, and things like that.
We're both mystified by a part which is identified as Honda part "(17196-MN5-000) PIPE A, AIR VENT". It's a combination of metal and rubber hoses which a wraps around the back of the Air Filter Housing and has a short metal "tail" pipe which points to the rear of the bike. If you've seen this before, you probably know what I'm talking about.
Who amongst you knows what this is and how does it function? It seems like an air line to me, but when I blew (gently) into the tail piece, fuel bubbled out into both carbs. Is that normal or to be expected? And why doe the tail end not hook into another hose or something?
Someone please explain to me if you can.
Thanks and Happy New Years to all.
dvc


Back in the San Diego area!

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vtxcandyred
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Location: Oregon, Ohio
Motorcycle: 1993 Honda Goldwing SE

Re: 1988 1500 Mystery Part

Postby vtxcandyred » Wed Dec 29, 2010 7:35 am

GL1500 '88 '89 '90 GL1500SE '90 '91 GL1500A '91 GL1500I '91Block No.F 22 If you go to manuals at the beginning of this site and fine your particular bike you can break it down for a more detailed look. http://goldwingdocs.com/Docs/Honda%20Goldwing%20GL1500%201988%20to%201991%20Honda%20Parts%20Manual-7D57B.pdfAt the top you can put in 17196-MN5-000 in the search box and find it exactly on the page you are looking for.

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WingAdmin
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Motorcycle: 2000 GL1500 SE
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1989 PC800 (wife's!)
1998 XV250 Virago (sold)
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Re: 1988 1500 Mystery Part

Postby WingAdmin » Wed Dec 29, 2010 10:59 am

You can see it here, as part number 5:

GL1500 Carb Breakout
GL1500 Carb Breakout


I don't know about the inner workings of GL1500 carburetors, so I can't even venture a guess as to its purpose.

93Wing
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Re: 1988 1500 Mystery Part

Postby 93Wing » Wed Dec 29, 2010 1:27 pm

I'm not sure myself but it may be a vent for both carbs.....

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vtxcandyred
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Location: Oregon, Ohio
Motorcycle: 1993 Honda Goldwing SE

Re: 1988 1500 Mystery Part

Postby vtxcandyred » Wed Dec 29, 2010 1:40 pm

93Wing wrote:I'm not sure myself but it may be a vent for both carbs.....

That was my thinking too.

wrholman
Posts: 2
Joined: Sun Jan 22, 2012 12:26 am
Location: New Iberia, LA
Motorcycle: 1988 GL1500

Re: 1988 1500 Mystery Part

Postby wrholman » Tue Jan 31, 2012 11:55 pm

1st post, New GOLDWING owner of an old bike.

Ok.. i DEFINITLY know the part. I have acquired a 1988 Gl1500. Its been setup for about 4 years, under a shelter but in the weather, and was knocked down by a hurricane.

Anyway.. i have cleaned it up to find a fuel pump problem and after following Berry's instructions, I now have a fuel pump that when connected and try to crank the bike fuel sprays out of the vaccum petcock pinhole on the left AND OUT OF THIS MYSTERY VENT TUBE.

The bike will kinda sorta run, if i keep pulling the wire off and on the fuel pump....

Sounds to me like my "NEW" fuel pump is over pumping, or something in the fuel system is allowing fuel to backup the vent tubes...

thoughts anyone???

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virgilmobile
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Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
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84 GL 1200 I

Re: 1988 1500 Mystery Part

Postby virgilmobile » Wed Feb 01, 2012 9:10 am

You have 2 problems.First my 88 did the same.The vacuum fuel shutoff valve(just in front of the gas cap)is leaking from the vent hole.I couldn't find any replacement rubber for it.I replaced it with a electric valve(internet order). For a temporary,plug the vacuum line and bypass the valve.
The gas coming from the metal tube(which is a vent) indicates that a float is stuck.Most likley the carbs will have to come off for a cleaning.If it's anything like mine(set uo for 3 years in Houma)..I spent 9 hours just getting the carbs fixed.I also had to replace a few vacuum hoses down in the bowles of the bike too.Here's a posts about my woes...viewtopic.php?f=6&t=9224

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talldog
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Location: Montgomery, Alabama
Motorcycle: 1988 GL1500

Re: 1988 1500 Mystery Part

Postby talldog » Sun Jul 22, 2012 11:11 pm

WingAdmin wrote:You can see it here, as part number 5:
I don't know about the inner workings of GL1500 carburetors, so I can't even venture a guess as to its purpose.


Here's a pic of what it looks like on my 88 GL1500 non-California model. Notice the gadget at arrow 1. The skin is back on my bike now, but i think the large hose at arrow-2 is a plugged vent to roadway. I have no clue where the smaller hose at arrow-3 goes, but i'm pretty sure it T's just out of view under the metal tube mentioned above (part #5). The un-hosed outlet on that gadget appears to have never had a hose attached.

BTW, if anyone can further enlighten me on the name/function of that gadget I would appreciate it. It seems to be missing on most GL1500s and i can't find it in the manuals.
Attachments
88 GL1500 mystery gadget
88 GL1500 mystery gadget

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robb
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Location: Lexington, North Carolina
Motorcycle: 1989 Honda GL1500 Aspencade

Re: 1988 1500 Mystery Part

Postby robb » Mon Jul 23, 2012 10:39 am

Could this be a California bike that had a lot's more emission tubing than others.

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talldog
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Motorcycle: 1988 GL1500

Re: 1988 1500 Mystery Part

Postby talldog » Mon Jul 23, 2012 12:18 pm

robb wrote:Could this be a California bike that had a lot's more emission tubing than others.


I don't think so. I bought the bike in Alabama and don't know much of its history, but the serial number indicates it is a NON-California bike.

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WingAdmin
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Re: 1988 1500 Mystery Part

Postby WingAdmin » Mon Jul 23, 2012 3:55 pm

That's the evaporative carburetor air vent control valve, and it exists only on California bikes.

California GL1500 evaporative emissions system
California GL1500 evaporative emissions system

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talldog
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Motorcycle: 1988 GL1500

Re: 1988 1500 Mystery Part

Postby talldog » Mon Jul 23, 2012 4:51 pm

WingAdmin wrote:That's the evaporative carburetor air vent control valve, and it exists only on California bikes.


Thanks for your response, but now I am very confused. Based on your response I did more research and verified that my 88 GL1500 has the complete "California" emissions system installed, but it definitely has a 1HFSC221... (NON-California?) VIN (just re-checked). :shock:

My VIN ends in ...000848. Perhaps on these very early 1988 bikes they had not established the 220/221 VIN rule. :?:

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talldog
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Motorcycle: 1988 GL1500

Re: 1988 1500 Mystery Part

Postby talldog » Mon Jul 23, 2012 6:01 pm

talldog wrote:
WingAdmin wrote:My VIN ends in ...000848. Perhaps on these very early 1988 bikes they had not established the 220/221 VIN rule. :?:


Or, perhaps the bike was born NON-California and had to be "upgraded" to be registered in California? Perhaps Honda was short on production California bikes and converted this one at the end of the production line? Guess it doesn't make much difference, but i'm curious. Any thoughts?

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robb
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Re: 1988 1500 Mystery Part

Postby robb » Mon Jul 23, 2012 9:35 pm

Since California emmisions were produced x amount in a run, it is more likely it was a leftover in inventory and sent south as is. Vins are completed at time of shipment from factory.




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