New owner needs some tech advice


Information and questions on GL1000 Goldwings (1975-1979)
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Cappy
Posts: 14
Joined: Wed Jun 17, 2015 8:47 pm
Location: Newnan, Ga USA
Motorcycle: 77 Goldwing gl1000

New owner needs some tech advice

Postby Cappy » Thu Jun 18, 2015 10:39 am



Hello All. I recently purchased a great looking 77 - black with Vetter fairing and bates bags. The bike runs great on three cylinders, but number one doesn't seem to fire. Here is what I know so far: Compression seems ok. There is fuel in the bowl. I have a good spark. The exhaust header for #1 gets a little hot, but noting like the others. There is a lot of popping through the exhaust at idle up to about 2500 rpms. The "button" on top of that carb is broken completely through. Carbs were cleaned and rebuilt by Pete 5 years and 10K ago. Plug is black but not oily or fowled. I'll send the carb top to Pete for a fix. I must have a vacuum leak but have not found it yet. Can the broken button cause such a leak? Ignition (Dyna S) shouldn't be an issue as the other cylinders of firing just fine. A carb sync won't help until I can get it firing. When I pull the plug wire on #1, RPM's don't drop, but the popping stops. Also, is it possible the air cut-off valve could be effecting only one cylinder?

Any help will be much appreciated.



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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: New owner needs some tech advice

Postby virgilmobile » Thu Jun 18, 2015 11:26 am

The button should be sealed.There is a large "O" ring where the carb bolts to the head.
I would be tempted to swap the spark plug and resistor cap with a running cylinder to test if possible.If it has points,Carefully and exactly follow the book AND the "split the difference" method for precise timing.
Adjust the valve lash and check the cam timing marks.

Cappy
Posts: 14
Joined: Wed Jun 17, 2015 8:47 pm
Location: Newnan, Ga USA
Motorcycle: 77 Goldwing gl1000

Re: New owner needs some tech advice

Postby Cappy » Thu Jun 18, 2015 12:29 pm

Thanks for the quick reply. I grounded the #1 plug on the engine case and the spark is nice and blue. I'll check the valve adjustment tonight, but the ignition is a Dyna S which I thought is a "one time set up the then forget it" situation. I'll also spray some starting fluid around the O-ring area you mentioned. (or an unlit butane torch) Thanks again. It's always good to have help with these old, but great, bikes.

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Ncscooter
Posts: 53
Joined: Wed Jun 17, 2015 11:20 am
Location: North Carolina
Motorcycle: 77 GL1000
76 CB400F

Re: New owner needs some tech advice

Postby Ncscooter » Thu Jun 18, 2015 2:13 pm

The button could be your whole problem.
Keep your expectations tiny and you won't end up so whiny.

Cappy
Posts: 14
Joined: Wed Jun 17, 2015 8:47 pm
Location: Newnan, Ga USA
Motorcycle: 77 Goldwing gl1000

Re: New owner needs some tech advice

Postby Cappy » Thu Jun 18, 2015 2:55 pm

Thanks Scooter. If that's the problem, it will be an easy fix, I'm sending all 4 to Pistol Pete next week. I appreciate your reply.




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