Fuel Economy Questions


Information and questions on GL1100 Goldwings (1980-1983)
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Kama
Posts: 34
Joined: Fri May 25, 2012 8:33 pm
Location: Lone Grove, Oklahoma
Motorcycle: 1980 Honda Goldwing GL1100

Fuel Economy Questions

Postby Kama » Sat Jul 07, 2012 7:11 pm



Alright, most of you guys know I've been bringing a '80 GL1100 back to road worthy condition. I've finally got it going, carbs cleaned, and its running great. Now after running a few tanks of gas through it I took it for a long haul today. Off a full to the max fill up I got 90 miles on it before I had to switch it over to reserve... Not exactly what I've been looking to get out of it. So, with some inspection, I've found that I've got a back brake that is dragging, and obviously I need to sync it (although the bike runs really smooth). Are there any other things you can think of that could be pulling the milage down? I went through the carbs (without breaking them apart and un-syncing them) and cleaned or replaced all the jets that needed it. Since I did not break it apart I did not change out the air-cut off's because you can't access two of them without breaking them apart. I also did not replace the accelerator pump because it was running and idling so well. All of the coils, wires, and boots are original. Could those be a milage issue as well? I know I need to replace them (boots and wires), but I just haven't gotten to it yet. But it does have a new air filter and 4 new plugs in it. Any more ideas?

The way my schedule is, I get M-F to come up with solutions to questions and get the parts here. Then Sat to work on it and use the following M-F to test and get results or more questions to answer. So I'm trying to get as much data as I can and see what my best approach is, both mechanically and financially as I'm on a limited budget.



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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
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Re: Fuel Economy Questions

Postby WingAdmin » Tue Jul 10, 2012 1:09 pm

The dragging brake could certainly be the cause of that - while a carb sync certainly won't hurt, my first plan of attack would be that brake, and see what kind of difference that makes.

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NKYWinger
Posts: 344
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Location: Covington, KY
Motorcycle: 1983 GL1100A Aspencade
2003 GL1800

Re: Fuel Economy Questions

Postby NKYWinger » Tue Jul 10, 2012 1:39 pm

^^^What he said...I can go 'bout 140 miles before it stats blinkin' at me....
--John--

FTCS(SS) USN Ret.
'83 GL1100 Aspy (SOLD)
'03 GL1800
'08 Lees-ure Lite
GWRRA 339547 KY - 'G'
DS# 1547

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Kama
Posts: 34
Joined: Fri May 25, 2012 8:33 pm
Location: Lone Grove, Oklahoma
Motorcycle: 1980 Honda Goldwing GL1100

Re: Fuel Economy Questions

Postby Kama » Tue Jul 10, 2012 1:56 pm

Ya, I'm going to start with that for sure, as well as the wheel bearings.

Now, my grandfather is convinced its tied to the choke possibly being stuck open. I've inspected it from the outside of the carb and the wheel the cable connects to is all the way down as it should be ( or at least it looks that way). Has anyone ever had a case where the choke has look closed but actually been stuck open inside the carb? He said he believe that is the only way the gas milage could have swung so far down. Any ideas there?

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Rick_MD
Posts: 34
Joined: Wed Nov 02, 2011 6:33 pm
Location: Northeastern, MD
Motorcycle: 1982 GL1100I

Re: Fuel Economy Questions

Postby Rick_MD » Wed Jul 11, 2012 5:35 pm

Fix the back brakes!

I delayed doing mine with low fuel mileage issues and suffered a melted caliper, smoked rotor & rear brake hose. It was only sticking once in a while.

By the time I bought a new rotor, used caliper to rebuild, kits for master cylinder, caliper and all the necessary related parts, I was $500. into the repair.

I am not going to go into the back brake locking up and welding the brake pads to the rotor. I am just happy to have walked away from that one without any damage to the bike or myself! :shock:

bbells
Posts: 42
Joined: Sat Jun 23, 2012 7:54 pm
Location: Minneapolis, Minnesota
Motorcycle: 1982 GL1100 Aspencade

Re: Fuel Economy Questions

Postby bbells » Thu Jul 12, 2012 4:44 pm

If it isn't mechanical it could be behavior:
Check your speed. If you ride fast it may be normal. I get over 40 riding 55 mph. I get a little more than 30 riding 70+.
Tailgating can reduce your gas mileage by 30%.
Fast take offs can reduce your mpg by 20%.

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Kama
Posts: 34
Joined: Fri May 25, 2012 8:33 pm
Location: Lone Grove, Oklahoma
Motorcycle: 1980 Honda Goldwing GL1100

Re: Fuel Economy Questions

Postby Kama » Thu Jul 12, 2012 4:55 pm

Can I get someone with a comparable year model to my gl1100, to try something for me? After 10 min of running, pull the choke and tell me what it does. Does it rev up, or bog down? Mine will rev up to about 4k. In my experience adding gas (choke) should bog it down, correct?

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littlebeaver
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Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
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Re: Fuel Economy Questions

Postby littlebeaver » Thu Jul 12, 2012 5:18 pm

Sir I have a 81 it's basically the same, it bogs down when I do that..

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Kama
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Joined: Fri May 25, 2012 8:33 pm
Location: Lone Grove, Oklahoma
Motorcycle: 1980 Honda Goldwing GL1100

Re: Fuel Economy Questions

Postby Kama » Thu Jul 12, 2012 5:23 pm

littlebeaver wrote:Sir I have a 81 it's basically the same, it bogs down when I do that..

Thank you! Now I have a starting point... I have to figure out why... Lol

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SteveB123
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Motorcycle: 1982 1100I, 60A Poorboy, MSD coil

Re: Fuel Economy Questions

Postby SteveB123 » Fri Jul 13, 2012 5:39 am

Kama wrote:Can I get someone with a comparable year model to my gl1100, to try something for me? After 10 min of running, pull the choke and tell me what it does. Does it rev up, or bog down? Mine will rev up to about 4k. In my experience adding gas (choke) should bog it down, correct?


It would, if all it was doing was adding fuel. It also adds throttle.


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