84 GL1200 standard getting Very, very bad fuel mileage


Information and questions on GL1200 Goldwings (1984-1987)
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G-Wiz
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Joined: Wed Jun 15, 2016 11:31 pm
Location: Blaine, Washington
Motorcycle: 1984 GL1200 Standard

84 GL1200 standard getting Very, very bad fuel mileage

Postby G-Wiz » Wed Oct 05, 2016 9:34 pm



So this will be my first post ever. Yay. So, about 4 months ago I bought my grandads 84 GL1200 standard with 22k miles on it. The bike had been parked for roughly 5 years. I towed it home as it sill had the origional timing belts and tires not to mention it was parked for 5 years. Stripped it down in my garage. Replaced tires, timing belts, spark plugs, removed, drained, and thoroughly cleaned fuel tank, vacuum lines, fuel lines, fuel oil and air filters, rear diff\final drive oil, flushed all brakes and clutch, fuses, repaired short to ground in taillight and installed a new agm battery. I think the only thing that wasnt touched was the fork seals which I will be doing this weekend as the weather here in WA is starting to turn. I noticed after a couple of rides that the fuel mileage was horrible and there was a strong smell of fuel after a ride. So, I ordered a K&L rebuild kit as Randakks was out of stock and still is. I did notice that someone had already been in there somewhat recently because all of the carbs and jets were pretty well new and clean. One of the diaphrams on the carb slides was folded in which i assumed was the cause of the poor fuel economy. Put everything back together and synced correctly and have been riding all summer. Have put about 600 miles on the bike and still have horrible mileage. I am averaging about 15-17 mpg in town and 20-25 highway. I have changed spark plugs twice, oil 3 times, re lubed choke cable, brakes are free and no drag. I dont know what else to do. I am planning on pulling the carbs again to check the float levels again for a third time but not sure what else to do. I filled my tank again today after work with 51 miles on the trip meter and 3.3 gallons of gas which is pretty consistent. Am I overlooking something? What could be causing the poor mileage? Any advice would be more than appriciated as I would like to put some miles on this thing next summer.



sportsfreaked
Posts: 234
Joined: Fri Mar 13, 2015 7:23 am
Location: Independence, MO
Motorcycle: 1981 Honda Goldwing Interstate GL1100I
1985 Honda Goldwing Limited Edition gl1200

Re: 84 GL1200 standard getting Very, very bad fuel mileage

Postby sportsfreaked » Thu Oct 06, 2016 4:39 pm

Is fuel leaking into the crankcase at all? Do you still have the smell of gas when shutting off? It's obvious that you are losing gas somewhere. Just throwing this out there but have you checked the shut off valve to make sure it's not leaking. How about fuel filter? Just throwing some things out there to think about.
Thanks to all who answer and help. It is greatly appreciated!
Ed

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G-Wiz
Posts: 6
Joined: Wed Jun 15, 2016 11:31 pm
Location: Blaine, Washington
Motorcycle: 1984 GL1200 Standard

Re: 84 GL1200 standard getting Very, very bad fuel mileage

Postby G-Wiz » Thu Oct 06, 2016 6:48 pm

I did have fuel getting in the crankcase before the carb rebuild but not after. I am getting a very faint fuel smell every so often after shut off but not as bad as it was. Petcock and fuel lines are not leaking. I check everything over before and after every ride just to be sure. Fuel filter still appears clean. I replaced it with a clear filter so that I could monitor it. I am planning to change it again this weekend however just for good measure. Plugs are not fouled. I do get the typical smoking on cold startups but smells of oil, not fuel. I am at a loss as to where the fuel is going. I feel I should say that most of my rides are just to and from work which is only 2 miles down the road I normally take a longer route of about 5 miles so that I hear the fan kick on before im at my destination. Im sure the short trips are contributing to the poor mileage but 16-17mpg still seems wrong.

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G-Wiz
Posts: 6
Joined: Wed Jun 15, 2016 11:31 pm
Location: Blaine, Washington
Motorcycle: 1984 GL1200 Standard

Re: 84 GL1200 standard getting Very, very bad fuel mileage

Postby G-Wiz » Fri Oct 07, 2016 8:34 pm

So I rechecked everything after work today and found the vacuum line to the advance box was pinched. Also ordered a new air cutoff valve that should be in next week. Gonna take apart the carbs again this weekend and re measure everything just to make sure. Also since I will be replacing my thermostat I plan to recheck the timing belts. If anyone has any advice on what else to check while I'm in there please let me know.

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G-Wiz
Posts: 6
Joined: Wed Jun 15, 2016 11:31 pm
Location: Blaine, Washington
Motorcycle: 1984 GL1200 Standard

Re: 84 GL1200 standard getting Very, very bad fuel mileage

Postby G-Wiz » Tue Feb 21, 2017 9:52 pm

So i have an update to my predicament. Unfortunately, I was wrong about my brakes not dragging. My bike has been parked since early November and I noticed last month that my fork seals had leaked all over my brakes and garage floor. So I rebuilt the forks and changed both sets of front pads. Right side caliper completely seized up. Could not move the front wheel at all. I removed and rebuilt both calipers and its better, but there is no "return" from the right caliper. Rear master cylinder is the culprit. I will be rebuilding it in the next couple of weeks. My theory is that the master cylinder was the problem the whole time, or I am hoping at least. Right now, with both wheels on the ground i can roll the bike back and forth the same as before. With both wheels off the ground, something I never checked before, there is resistance in both the front and rear wheel. One question I have is about the linked brake set up. I know this topic is brought up a lot all over the internet but I am thinking of converting it to 2 front one rear and would like to know of any disadvantages to this. Also if the stock front master cylinder can handle the load of both calipers. I have a few times been trail braking through slow traffic and had my front tire skid and, well, I don't like it. Could be related to the master cylinder problem though. Any replies are more than welcome. Wingadmin specifically. You seem to have the most knowledge on these things and would love to hear your thoughts,

sportsfreaked
Posts: 234
Joined: Fri Mar 13, 2015 7:23 am
Location: Independence, MO
Motorcycle: 1981 Honda Goldwing Interstate GL1100I
1985 Honda Goldwing Limited Edition gl1200

Re: 84 GL1200 standard getting Very, very bad fuel mileage

Postby sportsfreaked » Tue Feb 21, 2017 10:08 pm

There are people that have done what you are thinking. If you do a search I'm sure you will find links on the subject. Best of luck.
Thanks to all who answer and help. It is greatly appreciated!
Ed

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G-Wiz
Posts: 6
Joined: Wed Jun 15, 2016 11:31 pm
Location: Blaine, Washington
Motorcycle: 1984 GL1200 Standard

Re: 84 GL1200 standard getting Very, very bad fuel mileage

Postby G-Wiz » Tue Feb 21, 2017 11:12 pm

I have found a lot online on the subject but no real fallow through save one guy who blogged his experience. I still have no real advantage vs disadvantage for comparison except for the "I was taught to do it this way" vs. the "leave it as intended" arguments. No real solid yes or no on the subject. I'm tempted to try it both ways just to post results.

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Rednaxs60
Posts: 841
Joined: Wed Nov 18, 2015 12:44 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 1985 GL1200 LTD, 2008 GL1800

Re: 84 GL1200 standard getting Very, very bad fuel mileage

Postby Rednaxs60 » Wed Feb 22, 2017 11:04 am

Read a lot about this, but as you mention there is no definitive answer to your question. I am all for doing modifications to my bike when my pocket book is impacted, due to obsolescence, or it just makes sense. The closest I have come to any change to the brake system is when I have had the suspension upgraded and it has impacted on the anti-dive system - this was/is the case when I upgraded my 1800 suspension to the Traxion front and rear suspension replacing the OEM suspension, and also putting Race Tech suspension in my '85 1200 Limited edition.

An item I would have to consider for any change is the size of the front caliper pistons. The left front caliper pistons are the same size as the rear caliper pistons. The right front caliper pistons are smaller than the left front and rear caliper pistons. I believe this is because of the linked braking system where Honda does not want the front caliper overpowering the rear caliper when the rear brake is applied - just my thought on the difference. I have not read where people have found a replacement caliper for the right front of a 1200 that would have the same size caliper pistons as the left front caliper.

I found an article about motorcycle braking systems and there is a good section on anti-dive brakes and the TRAC system. Here is the site:http://www.carbibles.com/suspension_bible_bikes.html

Just a few thoughts. Cheers
"When you write the story of your life, don't let anyone else hold the pen"

Ernest

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SilverDave
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Joined: Sun Aug 09, 2009 9:39 am
Location: Langley, BC
Motorcycle: 1985 GL1200 GoldWing Aspy

Re: 84 GL1200 standard getting Very, very bad fuel mileage

Postby SilverDave » Wed Feb 22, 2017 11:26 am

If you get both MC rebuilt, and ALL three calibers actually retracting.....
then I think you might better appreciate the Honda 60-40 linked system.... If your tires are new, and all three brakes releasing properly , you should never get much front wheel slip.

Check that little square "o" ring to be sure its in correctly ... it and the return valve do the minuscule return of the pads . Also check the 3 greased caliber bolts to be sure the caliber can move back and forth .
And check is all the small parts are in there ( Pad spring ) when you put it together.

I always test my front or rear new pad install with the bike up in the air . Any drag at all there after releasing the brake will definitely reduce mileage .

Oh ... and welcome to the forum ... we don't live very far apart !!

SilverDave , Langley, BC




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