plug in vacuum advance line


Information and questions on GL1200 Goldwings (1984-1987)
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flash1942
Posts: 129
Joined: Fri Jan 24, 2014 4:37 pm
Location: Midwest
Motorcycle: '84 Aspencade

plug in vacuum advance line

Postby flash1942 » Wed Apr 08, 2015 11:54 am



I was told that the plug in the ICU vacuum line has a tiny hole in it to better control the advance rate. Can anyone verify that?



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virgilmobile
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Previously owned
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Re: plug in vacuum advance line

Postby virgilmobile » Wed Apr 08, 2015 3:01 pm

To my knowledge,the vacuum line is a direct open connection to the vacuum sensor in the ECU.The connections are small at the ECU sensor which should help stabilize the vacuum pulsing in the sensor.
There is a "T" in the line with a short hose and a plug.Its for testing.
Is yours not working correctly?

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deanbw
Posts: 278
Joined: Sun Nov 30, 2014 2:30 am
Location: puyallup,wa.
Motorcycle: 1986 gl1200a aspencade . Honda xl600r, '68 z50, '82z50, '80cx500c, '00 klr250

Re: plug in vacuum advance line

Postby deanbw » Wed Apr 08, 2015 11:54 pm

on my 1200, there is a "T" about 4 -6 inches from the ECU. One end to the ECU, one to the carburetor and one to a short tube about 4 inches long that has a small plastic orifice in the end, the orifice has a small hole in it, maybe .020 - .030 ? just guessing.
So to answer your question, yes mine at least has a restriction orifice.

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deanbw
Posts: 278
Joined: Sun Nov 30, 2014 2:30 am
Location: puyallup,wa.
Motorcycle: 1986 gl1200a aspencade . Honda xl600r, '68 z50, '82z50, '80cx500c, '00 klr250

Re: plug in vacuum advance line

Postby deanbw » Thu Apr 09, 2015 1:14 am

I looked through my "before tear down" pictures and I found one of the tube in question. it is on left frame tube under shelter....well, it should be.
here is a picture with arrows showing "T" and orifice

flash1942
Posts: 129
Joined: Fri Jan 24, 2014 4:37 pm
Location: Midwest
Motorcycle: '84 Aspencade

Re: plug in vacuum advance line

Postby flash1942 » Thu Apr 09, 2015 9:36 am

Guys, that plug I'm talking about is not open all the way thru on my 'wing and from what I can tell that is the way it should be (pull yours out and take a look to see). I have been trying to chase down a rough running problem and thought maybe the plug should have an orfice and if it was plugged could be the problem.. At present I'm going thru the carbs. The ign pulsers check out per the manual and the ICU is next, if I can find one.




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