1977 gl1000 fuel trouble


Information and questions on GL1000 Goldwings (1975-1979)
  • Sponsored Links
Post Reply
N55ta
Posts: 2
Joined: Wed Aug 30, 2017 9:51 pm
Location: Sydney,nova Scotia,canada
Motorcycle: 1977 holdin

1977 holding 1000
2000 valkyrie 1500
2001 valkyrie 1500 trike
2003 holding 1800 trike

1977 gl1000 fuel trouble

Post by N55ta » Fri Oct 06, 2017 5:48 pm



Bike starts and idles ok but when go to pull away it dies,you have to keep pumping the throttle to pull away
Carburetor were cleaned late year and were pretty clean before cleaning



User avatar
Fred Camper
Posts: 1232
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: 1977 gl1000 fuel trouble

Post by Fred Camper » Sat Oct 07, 2017 8:16 am

perhaps the fuel pump is weak, since it is fine at idle, the pump works but perhaps cannot keep the bowls filled when you throttle up. You can always blame the carbs. This is also a symptom you get with water in the fuel. Idle can burn the water okay but as soon as you need to make power, then she dies.

cfairweather
Posts: 8
Joined: Mon Jul 10, 2017 2:00 pm
Location: Cheyenne
Motorcycle: 1975 GL1000, 1977 GL1000, 2013 BMW R1200RT, 1972 K1 CB750

Re: 1977 gl1000 fuel trouble

Post by cfairweather » Fri Oct 13, 2017 7:46 pm

Can you provide any more details? There are a number of things that can cause the GL1000 to run poorly, but from your short description, I would suspect the carbs have problems. Even though you cleaned them, they may be plugged up because there are small orifices that are easily overlooked. You also could have an air leak on the intake manifold connector tubes. Were the floats carefully set to 21mm? Did you verify the float level using clear tubes? I always use the "clear tube" method to verify the levels and also check to see if the float valve are leaking. You can do this with the carbs on the bike but I typically have them off. I use an electric fuel pump just to be confident there are no leaks.
Here are some things you can check:
1. Verify that the points, timing and valves are set correctly. Also verify the resistance of the spark plug caps. They should be about 5K ohms.
2. While the air filter lid is off, start and rev the engine a few times while looking into the plenum. If gasoline appears in the plenum, you either have leaky float valves or the plenum seals are bad.
3. If you remove the carbs again, clean them with an ultrasonic cleaner and use compressed air to blow out all passages. The small tubes that stick up in the throat of the carbs (Idle Discharge Port Jets) are easily overlooked. Make sure they are not clogged or the bike will not idle properly.

User avatar
Fred Camper
Posts: 1232
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: 1977 gl1000 fuel trouble

Post by Fred Camper » Sun Oct 15, 2017 7:17 am

Mike Nixon has a great book on rebuilding GL1000 carbs with lots of pictures and Randakks video is most excellent and worth the high price.

cfairweather
Posts: 8
Joined: Mon Jul 10, 2017 2:00 pm
Location: Cheyenne
Motorcycle: 1975 GL1000, 1977 GL1000, 2013 BMW R1200RT, 1972 K1 CB750

Re: 1977 gl1000 fuel trouble

Post by cfairweather » Sun Oct 15, 2017 8:05 am

I agree Fred. Both are excellent resources and Randakk's parts are top quality.

N55ta
Posts: 2
Joined: Wed Aug 30, 2017 9:51 pm
Location: Sydney,nova Scotia,canada
Motorcycle: 1977 holdin

1977 holding 1000
2000 valkyrie 1500
2001 valkyrie 1500 trike
2003 holding 1800 trike

Re: 1977 gl1000 fuel trouble

Post by N55ta » Sun Oct 15, 2017 8:44 pm

Bike also has a side car on it and runs good everywhere except pulling away from a stop, once you get it going it pulls good runs smooth i don't have a pressure gauge but when I remove fuel line and turn it over
It let a good squirt of gas out

User avatar
Fred Camper
Posts: 1232
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: 1977 gl1000 fuel trouble

Post by Fred Camper » Mon Oct 16, 2017 8:00 am

Not a water in the fuel issue then. The 1977 had an emission regulation issue and the off idle circuit is too lean. Two fixes are required. One is to solder closed the idle air jet then drill it out with a number 62. The other is to put tiny washers on the idle pin. There is a nice link over at NGW Club.com with the details.

sfruechte
Posts: 208
Joined: Tue Mar 09, 2010 12:53 pm
Location: La Crosse, WI
Motorcycle: 1977 GL1000

Re: 1977 gl1000 fuel trouble

Post by sfruechte » Wed Nov 01, 2017 9:23 am

Try pulling the choke out part way and see if that helps.

Also, if you still have points and don't have enough dwell (too large of a gap), can make for a week spark just when a stronger spark is needed.



Post Reply