GL1100 interstate

Information and questions on GL1100 Goldwings (1980-1983)
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Motorcycle: 1983 GL1100 Interstate

GL1100 interstate

Post by tonytromp » Wed Jan 05, 2011 1:15 am

hi Fellow GOLDWINGERS! what should my GL1100's fuel consumption be on the open road. i had a GL1000 for 21 years and recently got a good second hand GL1100,it is very heavy on fuel. i have stripped and synced my carburetters,but still get only about 10l/100km. i think that the vacuum advance is not working,any suggestions?

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Re: GL1100 interstate

Post by dingdong » Wed Jan 05, 2011 9:08 am

That works out to 23.48 mpg American. That's pretty low. How is the bike running? If the vacuum advance is bad there would be a definite performance problem that you would notice.

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Re: GL1100 interstate

Post by WingAdmin » Wed Jan 05, 2011 11:40 am

You should be getting between 5.2 and 5.8 L/100 km (between 40-45 mpg) on the highway, so there's definitely something not right.

Any chances you have a float valve stuck open?

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Re: GL1100 interstate

Post by littlebeaver » Wed Jan 05, 2011 1:18 pm

I have done my home work on the vacuum advance and here's the way to test it , get a mitty vac hand pump or any hand pump with a gauge on it, place it on the vacuum canister pipe for the hose, pump it up once or twice, the gauge will raise then bleed off air down to the correct settings for your 83 it should be 3.2 hg's on the gauge, once it stopped there or around there it should stop and hold vacuum.. If it bleeds off air from that point you have a leak, hole's in diaphragm or the epoxy cap came off the rear of the canister and air is leaking out there.. If you hear a click sound by just sucking on the hose then you know your baseplate inside is not frozen up like mine was, also your mechanical advance is under the pulse generator housing and that needs to be looked at and cleaned and lighty greased anyone or everyone that has a bad running bike should check both of these advances..hope this helps you sir.. Remove the swingarm to get to it.. :D

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