What is this?


Information and questions on GL1200 Goldwings (1984-1987)
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blueridgerunner
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Joined: Wed Jul 04, 2012 5:58 am
Location: Stuart, Virginia
Motorcycle: 1987 GL1200 Interstate

What is this?

Postby blueridgerunner » Sun Jul 29, 2012 2:58 pm



Found this under the tool tray. Anybody tell what these lines are (vent)? Seems to be one missing too.
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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: What is this?

Postby virgilmobile » Sun Jul 29, 2012 4:34 pm

One hose should go to the left rear intake down pipe(at the bottom inside),the other end should go to the electronic ignition module up near the front of the shelter.The other end of the "T" is suppose to have a short tee hose on it that is plugged off.If this is right,your vacuum advance system is not working and the left rear cylinder is sucking air.
The plugged line is for vacuum meter testing.

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blueridgerunner
Posts: 27
Joined: Wed Jul 04, 2012 5:58 am
Location: Stuart, Virginia
Motorcycle: 1987 GL1200 Interstate

Re: What is this?

Postby blueridgerunner » Sun Jul 29, 2012 5:00 pm

Thanks. I'll check it out

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blueridgerunner
Posts: 27
Joined: Wed Jul 04, 2012 5:58 am
Location: Stuart, Virginia
Motorcycle: 1987 GL1200 Interstate

Re: What is this?

Postby blueridgerunner » Sun Jul 29, 2012 6:52 pm

That was exactly it. I put a short piece of vacuum hose on it and plugged with a screw. Thank you

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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: What is this?

Postby virgilmobile » Sun Jul 29, 2012 8:22 pm

Your welcome.How's it running now?
when your in 2nd gear,hold the rpm right around 2 grand...add a little "choke" and see if the bike picks up or lugs down.
If it lugs down,you got a good carb system,mine picked up and smoothed out.I had to modify the slide needle by raising them to fix it.
After the cleaning and sync,mine will pull hard from a idle to red line.Just scared the bejeezers out of me.

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blueridgerunner
Posts: 27
Joined: Wed Jul 04, 2012 5:58 am
Location: Stuart, Virginia
Motorcycle: 1987 GL1200 Interstate

Re: What is this?

Postby blueridgerunner » Sun Jul 29, 2012 8:45 pm

I'll check it out tomorrow. Also, I think gas mileage wasn't too good @ 35-38 mpg around town but don't have a real good point of reference. Maybe this will help that.

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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: What is this?

Postby virgilmobile » Sun Jul 29, 2012 9:13 pm

I think mine is about that too.

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blueridgerunner
Posts: 27
Joined: Wed Jul 04, 2012 5:58 am
Location: Stuart, Virginia
Motorcycle: 1987 GL1200 Interstate

Re: What is this?

Postby blueridgerunner » Mon Jul 30, 2012 6:59 pm

Bike runs a lot smoother thru the power band now. Seems to have done the trick. Thanks again

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firstwing
Posts: 37
Joined: Wed Jun 22, 2011 3:05 pm
Location: Pittsburgh, PA
Motorcycle: 1985 GL1200A, 2006 Suzuki C50 Blvd.

Re: What is this?

Postby firstwing » Sun Aug 05, 2012 6:14 pm

I stumbled across this post and realized that mine has no plug on the "T"- side of the vacuum system. Does this affect the pilot screw adjustment. While trying to tune these screws, turning them in or out had absolutely no affect what so ever. I set them all back to preset, 2-1/4 turns out for now.

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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: What is this?

Postby virgilmobile » Sun Aug 05, 2012 7:22 pm

The vacuum line should only affect that one cylinder.there are 4 of them to adjust so if one is turned it would make just a small difference in the rpm.the adjustments are done at 950 rpm and watching for a 50 rpm drop.I just set mine the same way.2. 1/2 turns.The factory had them from 3/4 to 3 turns out.

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firstwing
Posts: 37
Joined: Wed Jun 22, 2011 3:05 pm
Location: Pittsburgh, PA
Motorcycle: 1985 GL1200A, 2006 Suzuki C50 Blvd.

Re: What is this?

Postby firstwing » Sun Aug 05, 2012 7:30 pm

Thanks. Makes perfect sense. Like I said, turning any screw in or out had no affect and I couldn't figure out why. I'll plug the vacuum line anyway of course.

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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: What is this?

Postby virgilmobile » Sun Aug 05, 2012 10:46 pm

Let's assume the engine is running at 900 rpm and the carbs are synced.If you turn in the idle jet screw till it bottoms out,that cylinder should stop firing.it should drop about 150-200 rpm or so.as it's opened back up,the rpm will rise to a level and then fall just a little,the 50 rpm drop.At that point the screw is turned back in about 1/2 turn.
It's really tough to see or hear that small drop without the special rpm gauge so most just stay with the factory settings.

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firstwing
Posts: 37
Joined: Wed Jun 22, 2011 3:05 pm
Location: Pittsburgh, PA
Motorcycle: 1985 GL1200A, 2006 Suzuki C50 Blvd.

Re: What is this?

Postby firstwing » Tue Aug 07, 2012 7:48 pm

Thank you. I'm going with factory settings for now because it's running pretty good. I'll look for the right tach. and puts with it off season. After all, that's what winter is for.




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