Poor Fuel economy on Gl 1100


Technical information and Q&A applicable to all years and models of Goldwings
Post Reply
bjcrit
Posts: 24
Joined: Tue May 25, 2010 11:41 am
Location: salem oregon
Motorcycle: 1981 GL 1100 std

Poor Fuel economy on Gl 1100

Post by bjcrit »



I have an 81 GL 1100 STD and have been riding to work for better gas milage. She runs fine, no back fires, no missing, smoth as can be. Easy starter.
When I recently noticed I'm only getting approx. 10 mpg or less. 5.3 leter tank, I can go 150 miles then reserve.
Obviously, new plugs, filters (oil and fuel), timing, valves.
Anything else I should be looking at?


User avatar
WingAdmin
Site Admin
Posts: 23754
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer
Contact:

Re: Poor Fuel economy on Gl 1100

Post by WingAdmin »

Actually it's 5.3 gallons, not liters. And 150 miles on 5.3 gallons is 28 mpg, not 10 mpg.

On the highway, I could normally get 45 mpg, or about 225 miles on a full tank. In the city, 30-35 mpg would be more common.

The standard things you listed - tires inflated, air filters, etc. will all help get your mileage up.
bjcrit
Posts: 24
Joined: Tue May 25, 2010 11:41 am
Location: salem oregon
Motorcycle: 1981 GL 1100 std

Re: Poor Fuel economy on Gl 1100

Post by bjcrit »

Sorry for the miss information.
Do you think the carbs need to be syncronized?
User avatar
WingAdmin
Site Admin
Posts: 23754
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer
Contact:

Re: Poor Fuel economy on Gl 1100

Post by WingAdmin »

In my experience, the only time carbs DON'T need to be synchronized, is when they've JUST been synchronized. :)

Yes a carb sync can help increase mileage. And you'll love the smoothness it creates. You can't hurt anything by doing a carb sync.
bjcrit
Posts: 24
Joined: Tue May 25, 2010 11:41 am
Location: salem oregon
Motorcycle: 1981 GL 1100 std

Re: Poor Fuel economy on Gl 1100

Post by bjcrit »

Thanks again for the info!
User avatar
dnehasert
Posts: 183
Joined: Sun Sep 27, 2009 11:25 pm
Location: Mesa AZ.
Motorcycle: 1982 GL1100 with Watsonian sidecar

Re: Poor Fuel economy on Gl 1100

Post by dnehasert »

Is it running rough ? A bad coil will cause poor mileage, check coils and wires.
bjcrit
Posts: 24
Joined: Tue May 25, 2010 11:41 am
Location: salem oregon
Motorcycle: 1981 GL 1100 std

Re: Poor Fuel economy on Gl 1100

Post by bjcrit »

Not at all, idles great, no back fires, quite responsive to throttle, starts easily.
How would I know if the coil is bad?
User avatar
dnehasert
Posts: 183
Joined: Sun Sep 27, 2009 11:25 pm
Location: Mesa AZ.
Motorcycle: 1982 GL1100 with Watsonian sidecar

Re: Poor Fuel economy on Gl 1100

Post by dnehasert »

A quick would check the coils , wires and caps. Measure across #1 to #3circuit cap to cap. Same on #2 to #4. Using an ohmeter you should read over 10,000 ohms, resistance of the pkug cap. If an onfifite reading then you have an open circuit. Could be coil ,wire or plug cap.
User avatar
dingdong
Posts: 4183
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: Poor Fuel economy on Gl 1100

Post by dingdong »

150 miles at 4 gallons (one gallon left at reserve) is 37.5 mpg. I'd say that is pretty good for commuting. Won't hurt to sync but I'll bet you see no difference. Pull and read your plugs that will tell you if there is a problem.
User avatar
seabee_
Posts: 495
Joined: Sun May 29, 2011 8:17 pm
Location: sterling heights, mi
Motorcycle: 1985 Honda Goldwing GL1200
117k miles
1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: Poor Fuel economy on Gl 1100

Post by seabee_ »

How about the air filter. You made no mention of that. If it's old or dirty that will affect the fuel mileage. Bad filter will cause less air and more fuel used.
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic
bjcrit
Posts: 24
Joined: Tue May 25, 2010 11:41 am
Location: salem oregon
Motorcycle: 1981 GL 1100 std

Re: Poor Fuel economy on Gl 1100

Post by bjcrit »

Thanks for the info guys;
Filter just done and plugs are all the same greyish brown color and dry, but I will replace them anyway. I have about 4000miles since last change.


Post Reply