Bad Gas Mileage


Information and questions on GL1200 Goldwings (1984-1987)
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JonBankston
Posts: 2
Joined: Sat Mar 20, 2021 10:16 am
Location: Bourne, Massachusetts
Motorcycle: 1985 GL1200A Aspencade

Bad Gas Mileage

Post by JonBankston »



Had a question about my Goldwing. I bought it non running about 6 months ago. Sat for a year or two with bad gas and winterizer in it. Rebuilt the carbs, added a filter, and synced the carbs. Now the bike starts and idles perfectly but will only accelerate correctly about 15% of the time riding it and it gets really poor gas mileage. Went about 20 miles or so and it burnt just about 1/2 a tank. I’m thinking it isn’t getting enough fuel pressure? I can’t quite figure this one out. These bikes are more complicated than what I’m used to.


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LeMaitre
Posts: 112
Joined: Mon Apr 10, 2017 8:03 pm
Location: NE Minnesota
Motorcycle: 1985 GL1200A Aspencade
1975 CB550F Super Sport

Re: Bad Gas Mileage

Post by LeMaitre »

20 mpg definitely is bad. 70+ MPH into a headwind got 29-32 mpg on winter gas last weekend on my '85 GL1200A.

No solutions but a couple of thoughts. Have you checked for vacuum leaks? Another thought is some kind of air restriction. Engine is getting adequate air at idle but as you accelerate you are actually decreasing the air mixture like running with the choke on.

-Mark
1985 GL1200A, MN SS1K, Iowa Ironbutt sign SS1K, MN-1000-2021
1975 CB550F, Lake Superior SS1K, 45-90 SS1K, All in Yooper SS1K
JonBankston
Posts: 2
Joined: Sat Mar 20, 2021 10:16 am
Location: Bourne, Massachusetts
Motorcycle: 1985 GL1200A Aspencade

Re: Bad Gas Mileage

Post by JonBankston »

I do remember a vac line that I’m not sure if I remembered to hook up when I put the carbs in. I can check that. But when sometimes it will accelerate perfectly and other times it’ll just choke on itself. But I will look for that line and get back to ya. Thanks
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