99 GL1500Se fuel mileage poor - Page 2 - Steve Saunders Goldwing Forums

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post #11 of 37 (permalink) Old 06-03-2019, 12:31 PM
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My 96 1500 got a consistent 43 MPG for nearly all of its 225000 mile life span before I sold it. The 1800 I now have gets 45mpg. No change in driving habits between the two bikes. All documented since I bought them. But I ride mine easy in to work (37.5 miles of interstate)and hard on the way home. Not quite as hard as some do though.


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2013 1800 Goldwing currently heading to 103k miles. New front tire-Trying Elite 4
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1996 1500 Aspencade 225000 miles (Sold for 2000$)
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post #12 of 37 (permalink) Old 06-03-2019, 02:16 PM
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form the wide range of reports on fuel mileage, it is obvious it depends on a LOT of factors, and the one that sticks out the most to me, is the guys who are in dense areas where speed limits never get above 55 mph, always report the highest MPG....


those of us who live in the wide open spaces, where it is 2 hours or more to the next stop, and 3,000 rpm is a mark down below the tachometer, we get less, always less.


my 1800 averages 33-35 and has only once or twice ever achieved more than 37mpg.


the biggest problem for me, is WIND RESISTANCE.... as the speedo is at 75 or more most of the time.... that never returns good mpg.
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post #13 of 37 (permalink) Old 06-03-2019, 03:45 PM
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the biggest problem for me, is WIND RESISTANCE.... as the speedo is at 75 or more most of the time.... that never returns good mpg.
For some reason mine gets better mileage at 75 than at 70. I have hardly ever got less than 40mpg on my 1800.

Back to the subject, there are reasons for less than average fuel economy, some have already been mentioned but the notorious bad vacuum hose under the carbs would be a good place to start.

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post #14 of 37 (permalink) Old 06-03-2019, 03:50 PM
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My experience tells me that it is not so much of the magic 3000 rpms as it is just the higher speed & the big fairing up front. The few times that I got to play on some twisties, I hardly ever dropped below 3000 rpms & my mileage didn't really suffer, but I wasn't trying to go 70 mph either.
I experienced that too. Once on a trip I got a phone call as I was leaving a town and the distraction caused me to stay in 4th gear from Artesia to Carlsbad NM, didn't affect my mileage at all.

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post #15 of 37 (permalink) Old 06-03-2019, 04:02 PM
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Happened to me on my way home from work last week. Thought engine was whining different then just happened to look down and didn't see the OD light on. It was about 4 miles like that at 70. No mpg change.


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2013 1800 Goldwing currently heading to 103k miles. New front tire-Trying Elite 4
New rear tire -trying elite 4(first one went 3k before nail took it out and destroyed tire)
1996 1500 Aspencade 225000 miles (Sold for 2000$)
Back from Sturgis trip 5300 miles and 9 days later(2016).
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post #16 of 37 (permalink) Old 06-03-2019, 08:25 PM
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Buddies 98 SE: would always smell fuel when it was running. Those that rode with me but behind always stated it was as though I was running incredibly rich, but yet I was not. Finally started noticing fuel leaking over the rear of one of the valve covers. Gaskets on bowels had gotten hard and dry and started leaking. Pulled carbs and did full rebuild on both using the randakk VITON kits. Viton has a 20+ year resistance to fuels especially anything alcohol based. With today's fuel ANY carb that has been running for 15+ years and with Buna n gaskets is long overdue to rebuild.
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post #17 of 37 (permalink) Old 06-04-2019, 11:49 AM
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I am thinking that my new to me 99 GL 1500 SE could get just a little better mileage. Smells quite rich when at idle even after warmed up. Almost always have to use enricher to get it to start unless I hold throttle slightly open. Runs very well and smooth, just stinks rich when running. Also idle speed adjustment does not effect idle speed when turned, just turns freely. Any answers from the 'old pros' out there??

only use 87 octane fuel.
use TC-W3 in correct ratio, mpg will increase 1-2 mpg and will keep carbs and back of intake and exhaust valves clean.

http://www.ls1.com/forums/f48/been-testing-oil-91206/
only use NMMA TC-W3 oils.
consider modifying the Ignition trigger wheel to provide 4 or 6 degrees of advance.
These engines do not have enough ignition advance at hwy cruising speed. more advance is needed due to the small throttle opening which results in an artificial reduced compression ratio. very good write up here about using different TW wheels. I modified my OEM one for six degrees advance.
https://www.goldwingfacts.com/forums...on-timing.html

seal any gaps in front fairing. after 40 mph aerodynamics has the biggest effect on fuel mileage.
correct air pressure, usually tire max or one or two lbs less.
concrete roads provide better mpg than asphalt roads by a lot. the more older and worn road the better mpg.

synthetic 75w90 gear oil in final drive.
clean/new OEM air filter. never use a k&n air filter.

Last edited by ValkyrieRider; 06-05-2019 at 02:27 PM.
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post #18 of 37 (permalink) Old 06-04-2019, 02:17 PM
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only use 87 octane fuel.
use TC-W3 in correct ratio, mpg will increase 1-2 mpg and will keep carbs and back of intake and exhaust valves clean.

http://www.ls1.com/forums/f48/been-testing-oil-91206/
.
The guy is right about using TCW3 oil but he's way off the mark on gasoline, in the 1970s to mid 80s we found clogged fuel filters often way before the specified 12,000 mile interval, today most gasoline engines never need a fuel filter. When fuel injection became popular they had to improve the fuel quality.
He must work for or have stock in Pennzoil.

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post #19 of 37 (permalink) Old 06-04-2019, 07:51 PM
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My 1500 is a trike, and if I keep under 60-65, even two up, can easily see 35 plus mpg. I have seen 38 on a fillup to fillup on trip on mostly mountain roads, speeds 50-55.
Try 70-75, it sucks gas faster than I care to calculate.


For a couple years awhile back, like in early twenty teens, late twenty ohhs… I used 1 oz TCW3 per 5 gallons regularly, it worked.

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post #20 of 37 (permalink) Old 06-05-2019, 10:42 AM
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Originally Posted by limpy45 View Post
...Almost always have to use enricher to get it to start unless I hold throttle slightly open...

Using the "Choke" lever is normal for 1500's. On very cold days you also would do well to Open the Throttle 1-2x, prior to starting the engine... eg That will enrich the fuel mixture enough to cold start quite nicely down to the teens


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GL1500, 1990SE, 220k miles
Front: Bridgestone Battlax BT45, 41psi
Rear: Austone 175R16, 50psi

GL1800, 2003, 60K miles [following virginity reconstruction]
Front: Bridgestone Battlax BT45, 41psi
Rear: Pirelli Winter Snowcontrol Series3, Run Flat, 41 psi
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