mystery part


Information and questions on GL1100 Goldwings (1980-1983)
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lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
Motorcycle: 1981 GL 1100 Interstate

mystery part

Postby lowmanj » Thu Jan 27, 2011 8:27 pm



What is this part, pictured from the right side of the bike?
It is where the carburator vacuum line attaches at rear of engine.
What's it called, what's it do and is it expensive?
Thanks



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WingAdmin
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Posts: 17047
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: mystery part

Postby WingAdmin » Thu Jan 27, 2011 10:29 pm

It's part of the pulse generator. That part in particular is the part that the vacuum hose connects to to actuate the spark advancer, which adjusts the timing of the engine when you accelerate and decelerate to prevent detonation and popping.

Pulse generator sets can be had for $150-$180, the advancer can be found for around $100-$120. You may be able to find them cheaper if you look around online.

lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
Motorcycle: 1981 GL 1100 Interstate

Re: mystery part

Postby lowmanj » Sun Jan 30, 2011 8:28 pm

I guess I'll let it go for now. I was going to throw a new one in since I have the bike broken down so far. But that's when I thought it was inexpensive, like an O2 sensor or something.
If it were to need replacing, what kind of indication would I see?
Thanks again.
Jesse

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WingAdmin
Site Admin
Posts: 17047
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: mystery part

Postby WingAdmin » Sun Jan 30, 2011 8:39 pm

The timing would not change when you opened and closed the throttle.

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littlebeaver
Posts: 4420
Joined: Mon Sep 21, 2009 6:11 pm
Location: Kansas City, Kansas
Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: mystery part

Postby littlebeaver » Sun Jan 30, 2011 10:37 pm

Lowmanj, I have messed around a bit with these vacuum canisters, first off I will tell you that you have a leak, I can tell just by looking at your photo, let me explain, I actually took one apart to see what does what and study the thing, if a person can see that screw on the rear of the canister then you have a leak there, they are all sealed but the seal comes off in time.. so get you some epoxy or J B Weld and make a spitball out of a small piece of tissue, stuff the hole with the spitball then seal it, the reason for this is so no epoxy goes inside..Let it dry then test it, I wrote a topic on this subject here explaining this so maybe you can get more from it..Yes you can adjust the timing with this canister I have done it, you will need a timing light to do so.. :D If anyone ever removes one of these units be careful not to spin the arm, and mark the baseplate with a marker before you remove it in case the arm get turned.. Good luck, if it still leaks you have a hole in your diaphragm in the canister. :D WingAdmin. is spot on with the information he gave you.. :D

lowmanj
Posts: 52
Joined: Thu Dec 30, 2010 7:42 pm
Location: Merritt Island, FL
Motorcycle: 1981 GL 1100 Interstate

Re: mystery part

Postby lowmanj » Sun Jan 30, 2011 11:13 pm

Thanks very much. I'll resurface the issue and work on timing once I get her running again. I'm rebuilding the carbs now, so will get into synching them and adjusting idle and checking timing soon as that's done.
In the meantime, I'll take a closer look at the screw you spoke of.
Jesse

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littlebeaver
Posts: 4420
Joined: Mon Sep 21, 2009 6:11 pm
Location: Kansas City, Kansas
Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: mystery part

Postby littlebeaver » Sun Jan 30, 2011 11:19 pm

I just checked mine and made some ajustments, if you need help I would say that you are around some really smart people here... Not me, but everyone else ha ha.. :D Here are a few photo's of the vacuum advance so you know what it all looks like apart, you must remove the swingarm to get it off, or remove the engine, swingarm's easier..
This is what it looks like off the bike
This is what it looks like off the bike
This unit is apart in this photo, the small nail is to remove the circlip
This unit is apart in this photo, the small nail is to remove the circlip
Attachments
This is apart, I did surgery, the diaphragm and it shows wear and had four small holes, common in these, because of of use and time..
This is apart, I did surgery, the diaphragm and it shows wear and had four small holes, common in these, because of of use and time..

rightwing
Posts: 1
Joined: Sat Mar 27, 2010 11:40 am
Location: Tulsa
Motorcycle: 1983 gl1100I

Re: mystery part

Postby rightwing » Thu Apr 07, 2011 8:58 am

So where do I purchase a new Vacuum unit. I now have two bad ones after buying used ones.

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littlebeaver
Posts: 4420
Joined: Mon Sep 21, 2009 6:11 pm
Location: Kansas City, Kansas
Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: mystery part

Postby littlebeaver » Thu Apr 07, 2011 10:58 am

Send me a pm perhap's I can help you out.. You can't buy them new anymore that I'm aware of..




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