MPG is out of wack...


Information and questions on GL1000 Goldwings (1975-1979)
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goldfish75
Posts: 11
Joined: Tue Oct 20, 2015 9:25 pm
Location: erie, pennsylvania
Motorcycle: 1975 Honda GL 1000

MPG is out of wack...

Postby goldfish75 » Tue Jul 12, 2016 10:24 am



Hey guys. Have a 1975 gl1000. It supposed to get 35-40 MPG but I'm getting more like 16-20. The bike runs and sounds good. I have new air filter, spark plugs, oil and whatnot replaced. Carbs maybe need synced? Any Ideas?



User avatar
virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: MPG is out of wack...

Postby virgilmobile » Tue Jul 12, 2016 10:30 am

Pull all 4 spark plugs.See what they look like for each cylinder.Compression test would be helpful too.

goldfish75
Posts: 11
Joined: Tue Oct 20, 2015 9:25 pm
Location: erie, pennsylvania
Motorcycle: 1975 Honda GL 1000

Re: MPG is out of wack...

Postby goldfish75 » Tue Jul 12, 2016 11:48 am

thanks. The plugs I just replaced. compression I haven't tested yet.

User avatar
virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: MPG is out of wack...

Postby virgilmobile » Tue Jul 12, 2016 12:14 pm

What did the plugs look like that you replaced?
Poor fuel economy is unburnt fuel going the system and not producing power..
Either from poor combustion (low compression/ poor spark)or too much fuel being delivered by one or more carbs.Spark plug condition tells much about each cylinder.

goldfish75
Posts: 11
Joined: Tue Oct 20, 2015 9:25 pm
Location: erie, pennsylvania
Motorcycle: 1975 Honda GL 1000

Re: MPG is out of wack...

Postby goldfish75 » Tue Jul 12, 2016 2:01 pm

they weren't burned/black but did have a bit oil on them. I'll check em again it's been about 250 miles since I change them so if I take a look now I'll see if there is any issues.

User avatar
virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: MPG is out of wack...

Postby virgilmobile » Tue Jul 12, 2016 2:13 pm

Take pictures for us.Its easier to see than imagine.
Does your bike have points or up fitted with electronic ignition?

User avatar
virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: MPG is out of wack...

Postby virgilmobile » Wed Jul 13, 2016 1:11 pm

By the way,don't discount the air filter...If it's clogged up..




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