FUEL COMPSION


Information and questions on GL1500 Goldwings (1988-2000)
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monty
Posts: 7
Joined: Fri Jul 31, 2015 5:48 am
Location: Darwin, Northern Territory Australia
Motorcycle: 1988 GL1500 Honda Goldwing

FUEL COMPSION

Postby monty » Wed May 25, 2016 5:16 pm



I have a 88 GL1500, the carby's have been rekitted but the problem is the fuel consumpsion. Currently it is using 3/4 of a tank for 100mls. could the float levels be set too high, or what other possible cause.



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virgilmobile
Posts: 7646
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: FUEL COMPSION

Postby virgilmobile » Wed May 25, 2016 6:08 pm

You say 3/4 tank per 100 miles.
How much gas is that.
My gas gauge isn't linear accurate.Even when it shows 1/4 tank left,I can only put in 3.5 gallons.
Fill it brim full,ride it normal for a hundred miles then brim fill it again.How much fuel is used?
My 88 averages 34mpg in town and back roads.
A bit better on the interstate.I usually see my needle near empty and still can get just 4-4.5 gallons.I usually see 140-150 miles on the trip before I look for gas..

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joeincalif
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Location: San Jacinto, Calif
Motorcycle: 1997 Gold Wing SE

Re: FUEL COMPSION

Postby joeincalif » Wed May 25, 2016 6:12 pm

If would be better if you told us how much gas in gallons it takes to go 100 miles. Fuel gauges can be off.
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monty
Posts: 7
Joined: Fri Jul 31, 2015 5:48 am
Location: Darwin, Northern Territory Australia
Motorcycle: 1988 GL1500 Honda Goldwing

Re: FUEL COMPSION

Postby monty » Wed May 25, 2016 8:08 pm

appoliges, the correct distance was 100klms. or 60 mls per 3/4 tank which holds 24lt.
I will fill the tank today to be more acurate.
What I am concerned about is the float levels as well.
Would setting then at 7.5mm instead of 8mm cause this problem.

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Aussie81Interstate
Posts: 679
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: FUEL COMPSION

Postby Aussie81Interstate » Wed May 25, 2016 9:26 pm

Hi Monty,

My fuel consumption is about 34mpg as well - I live in NSW, do a fair bit of local riding (short trips) but do some longer trips as well.

My fuel gauge is also a bit hard to get used to - I can run 50 miles showing on full - then at 60 miles it is showing 1/2 to 3/4. I usually fill up with around 100 miles ( not k's) on the speedo, and then top it up - I have not run more than 120 miles - but I know It would be probably good for at least 150 miles, mine is also a 1988.

cheers

Charlie

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virgilmobile
Posts: 7646
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: FUEL COMPSION

Postby virgilmobile » Wed May 25, 2016 9:46 pm

A improper float setting can make a bike run lean or rich.
0.5mm is enough to make a bit of a change but not great.If I were to guess,raising the float 0.5 mm may change the fuel consumption by less than 5%.
Mine was about 38 mpg and a 2mm change dropped it to 34.
I didn't care and I'm sure its a touch rich but it does run really good.
My 88 was a bit rich and I verified that it would smooth out 10 seconds after I shut the fuel off.I remeasured the fuel level and adjusted the floats 2mm to compensate.
Essentially lowering the available fuel to the jets.
Pull all of the spark plugs,and inspect the condition.
You can search"how yo read your spark plugs" for details but if there a light tan,the engine is getting the correct mixture.

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brettchallenger
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Location: Driffield, the East Riding of Yorkshire, England
Motorcycle: 1978 Triumph Tiger TR7 (sold)
2000 Honda GL1500 SE
1985 MZ ETZ250 (a cold war special).

Re: FUEL COMPSION

Postby brettchallenger » Fri May 27, 2016 2:20 am

But before doing any mechanical changes make sure you know what the proper/accuratefuel consumption is. The fuel gauge is there as a guide, it is not accurate enough to measure actual fuel consumption.

Get to a fuel pump, zero the trip counter, and fill up with fuel to the brim. Then ride at least 200kms. When you are ready to fill up again,note the trip reading, and fill the tank to the brim once more, noting the amount of fuel it takes to do this. You now have an accurate reading of how much fuel you have used over a given distance. Use this to work out your mpg/litres per 100k or whatever.
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kane67
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Location: Vantaa, Finland
Motorcycle: Honda GL1500-88

Re: FUEL COMPSION

Postby kane67 » Fri May 27, 2016 11:19 am

And compare trip counter reading with true lenght (gps route or similar), there can be difference like speedo usually has.

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Aussie81Interstate
Posts: 679
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: FUEL COMPSION

Postby Aussie81Interstate » Fri May 27, 2016 5:44 pm

I'll see if I can add this attachment for my bikes fuel consumption.

This shows my bikes mpg average right at the top as 33.08 mpg and each line does some conversions of km/l and mpg and miles to k's etc. The last entries are the main areas of riding - local is Penrith-Penrith etc..

See if that helps

cheers
Attachments
bikestats1.txt
(4.75 KiB) Downloaded 39 times

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OldZX11Rider
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Joined: Mon Nov 09, 2015 9:25 am
Location: Garfield, Arkansas
Motorcycle: 1994 Honda GL1500 Goldwing SE

Re: FUEL COMPSION

Postby OldZX11Rider » Fri May 27, 2016 8:42 pm

Last November, right after I got my '94 1500, I was really wanting to ride and get to know my new bike.
I filled it up and took off. The fuel gauge stayed on the full mark for about the first 50 miles, (like someone else said).
Well, I got to enjoying the ride, the roads and the weather that day and forgot all about fuel. Next time I looked, the needle was just touching the red mark.
I had read my fuel capacity was 6.3 gallons. It took 5.3 gallons to fill up so I figured I still had a gallon left. Right now I can't remember my exact mileage but it was getting close to 200 miles.
I haven't run it that low again. :lol:
For he is the minister of God to thee for good. But if thou do that which is evil, be afraid; for he beareth not the sword in vain:

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brettchallenger
Posts: 457
Joined: Sat May 29, 2010 11:03 am
Location: Driffield, the East Riding of Yorkshire, England
Motorcycle: 1978 Triumph Tiger TR7 (sold)
2000 Honda GL1500 SE
1985 MZ ETZ250 (a cold war special).

Re: FUEL COMPSION

Postby brettchallenger » Sat May 28, 2016 6:41 am

This shows my bikes mpg average


Is this US gallons or imperial?
The game's afoot;
Follow your spirit: and upon this charge,
Cry — God for Harry! England and Saint George!

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OldZX11Rider
Posts: 1129
Joined: Mon Nov 09, 2015 9:25 am
Location: Garfield, Arkansas
Motorcycle: 1994 Honda GL1500 Goldwing SE

Re: FUEL COMPSION

Postby OldZX11Rider » Sat May 28, 2016 7:20 am

U.S. gallons. Oh, and none of that ethanol shinola either. :lol:
For he is the minister of God to thee for good. But if thou do that which is evil, be afraid; for he beareth not the sword in vain:

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Aussie81Interstate
Posts: 679
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: FUEL COMPSION

Postby Aussie81Interstate » Sat May 28, 2016 9:00 am

Brett,

I just used a metric conversion online to work it out the conversion factor was .2642 - whatever that equates to.

cheers
:)

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OldZX11Rider
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Joined: Mon Nov 09, 2015 9:25 am
Location: Garfield, Arkansas
Motorcycle: 1994 Honda GL1500 Goldwing SE

Re: FUEL COMPSION

Postby OldZX11Rider » Sat May 28, 2016 9:08 am

Oops! Open mouth insert foot. :cry:
(Again...)


For he is the minister of God to thee for good. But if thou do that which is evil, be afraid; for he beareth not the sword in vain:


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