Terrible Milage on my brothers 1500


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Clarencechapman
Posts: 24
Joined: Sun Apr 11, 2010 8:27 am
Location: Hastings, MN
Motorcycle: 1982 GL1100 Aspencade until 5-1-2017.
Now have 1992 GL1500SE

Terrible Milage on my brothers 1500

Post by Clarencechapman » Mon Jan 01, 2018 7:31 am



My brother has a 1500 that only gets about 25mpg. This is a significant drop. He used to be getting 40mpg. The bike runs fine. He has torn the bike apart looking for a fuel leak but has not been able to find one. He has replaced the air filter and fuel filter. He is pretty frusterated. I saw on another post that someone replaced the Vac lines. I suppose one could be cracked. I will suggest that to him but is there anyone else who could make a suggestion?
Thanks from the FROZEN NORTH!!!



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Erdeniz Umman
Posts: 531
Joined: Tue Oct 27, 2015 12:33 am
Location: Ankara Turkey
Motorcycle: 2000 GL1500SE

Re: Terrible Milage on my brothers 1500

Post by Erdeniz Umman » Mon Jan 01, 2018 8:15 am

You could also check the ignition system. Pull out the spark plugs one by one and look for a change at the engine sound and rpm. No change will indicate a ignition problem at that cylinder.

Carburetor synchronization, bad carb.slides, vacuum line leaks, bad spark plugs, bad air filter, bad engine coolant temp. sensor, bad ambient air temp.sensor are the other points may affect the mpg.

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offcenter
Posts: 410
Joined: Sat Sep 22, 2012 2:10 pm
Location: Lake Hopatcong, New Jersey
Motorcycle: 99 Gl-1500 SE
76 GL-1000
77 Honda Trail 90

Re: Terrible Milage on my brothers 1500

Post by offcenter » Mon Jan 01, 2018 10:54 am

25 mpg is crazy!
I get a fairly constant 42 with mine.
On a recent highway run from Boston to N.J. I got 45.
Good luck figuring out what's wrong.
George in Jersey.
99 Goldwing GL-1500 SE
76 Goldwing Gl-1000
77 Honda CT-90 "Trail 90"

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Clarencechapman
Posts: 24
Joined: Sun Apr 11, 2010 8:27 am
Location: Hastings, MN
Motorcycle: 1982 GL1100 Aspencade until 5-1-2017.
Now have 1992 GL1500SE

Re: Terrible Milage on my brothers 1500

Post by Clarencechapman » Mon Jan 01, 2018 2:59 pm

Erdeniz Umman wrote:
Mon Jan 01, 2018 8:15 am
You could also check the ignition system. Pull out the spark plugs one by one and look for a change at the engine sound and rpm. No change will indicate a ignition problem at that cylinder.

Carburetor synchronization, bad carb.slides, vacuum line leaks, bad spark plugs, bad air filter, bad engine coolant temp. sensor, bad ambient air temp.sensor are the other points may affect the mpg.
Thanks Erdeniz Umman...I will pass this information on to him.

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wingdings
Posts: 225
Joined: Mon Feb 10, 2014 12:48 pm
Location: London, England, United Kingdom
Motorcycle: Honda Goldwing gl 1989

Re: Terrible Milage on my brothers 1500

Post by wingdings » Tue Jan 02, 2018 12:58 pm

Hi saw your post there !! - Another thing to check is the timing belts - if they have slipped just one cog - it would be enough to give you very bad millage indeed - Take the cover off and have a look - mine was off by one cog - that made the bike give poor millage - view this link -viewtopic.php?t=9774 for more info !! also check the pet **** !! to -viewtopic.php? t=36257 Also check the rear back brake caliper is not sticking and the pads are not binding on the disc this could be another possible cause too !! .. hope this may help !! .. :D :D :D :D



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