2000 GL1500 Lousy Gas Mileage - Steve Saunders Goldwing Forums

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post #1 of 29 (permalink) Old 05-06-2009, 04:31 PM Thread Starter
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I can't seem to find adequate info searching for solutions to my problem, so here goes.



I am the third owner of a 25th Anniversary Goldwing. I acquired from a seller in North Carolina with 8K miles on the odometer. He isn't aware of any modications that would have resulted in the poor gas mileage issue.



Around town, I can only manage 27 mpg driving conservatively. I checked the exhaust on my 5-gas analyzer here at the college and it is running at about 5% CO at 2000 rpm under no load. It is running very rich, but plugs are not fouling out but show black carbon deposits.



I had the carbs gone through last year by a reputable shop and although it runs smoother, no improvement in mileage noticed. I suspect the original owner had the carbs modified to increase power/performance but this is only a guess.



My question is, what else, besides modified carbs, can cause the rich condition and yet exibit no other driveability or operational problems? It starts fine with the choke and I verified the chokes are releasing completely. The Honda dealer verified ignition and timing belt, etc. What else can I check short of replacing the carbs? Thanks.
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post #2 of 29 (permalink) Old 05-06-2009, 04:40 PM
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Partially plugged air filter is an easy check. I wouldn't doubt someone installed larger main jets thinking it would give more power. Are the needles adjustable? (washers) High float setting might increase richness a little too.

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post #3 of 29 (permalink) Old 05-06-2009, 06:32 PM
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Welcome to the forum. A manual will confirm the jet sizes for the year of your bike. when running rich its mostly the wrong float hight as far as i can remember all 1500 are 7.5mm if this is wrong re to big when they sync the carbs it wont give a correct reading so you need to go back and check same if there correct i would make it run a little lean buy closeing the gap a little also is the bike getting up to temp ok if the termostat is always open the bike would run coldas there is a heat exchanger on the bottom of the carbs to help vaporise the gas for better combustion

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post #4 of 29 (permalink) Old 05-06-2009, 06:44 PM
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ibhomer
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post #5 of 29 (permalink) Old 05-06-2009, 07:01 PM
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If you got a 25th edition with only 8K, you got a low mileage bike.

27 mpg. Sounds a bit low... I have a 1996 with about 44k... on the best of days I do 30. I have it up on the stand now replacing the timing belts... Rudy suggested that replace the timing trigger wheel while I was in there... I'm awaiting the part.

For what I can read and understand that'll boost the mileage and power a bit... hoping so anyway...

It will interesting to see how long this threads goes before someone mentions Seafoam.

G'Luck!

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post #6 of 29 (permalink) Old 05-06-2009, 09:11 PM Thread Starter
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Mike Toon wrote:
Quote:
Partially plugged air filter is an easy check. I wouldn't doubt someone installed larger main jets thinking it would give more power. Are the needles adjustable? (washers) High float setting might increase richness a little too.
I trust the shop that did the carb overhauls so I'm pretty sure the float levels are okay and that they are synched correctly. I have a feeling someone drilled out the main jets so checking the numbers may not shed any light. I suppose I can use my pin gauges to check them, but then what? I can't really putt down to the local Honda Hardware store and pick up the correct replacements, can I?

I was hoping for something obvious that might be malfunctioning; such as those solenoids. What do they do, anyhow? Please be very technical if you know because I've worked on autos for 30 years and have been teaching computer and emission controls (the BAR Smog Check Program) for the last 12 years so I am fairly sharp on cars and heavy duty trucks (LNG). I was raised on carburetion and now am addicted to fuel injection. Thanks again.
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post #7 of 29 (permalink) Old 05-06-2009, 09:42 PM
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The 1500 is not known for good "mileage".. 27mpg "around town" is perhaps a little low, but a lot depends on how you drive it.. It is not terrible... I have a 2000SE also, and last tank was about 32mpg highway... my 1100 gets 40+... I do think that your CO is too high ( was that at idle?) suggesting too rich... if that was idle, that can be leaned out with the idle mixture screws and will affect mileage particularly "around town" (low power)... and finally, the already mentioned float levels would be suspect to me even if a "reputable" shop did it.. unfortunately that requires a complete teardown to check it... ( I am kinda down on mechanics lately.. my recent experience has been do it myself or pay someone to mess with it before I still have to do it myself.. ) SDB/Jim

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post #8 of 29 (permalink) Old 05-06-2009, 09:47 PM
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I have a 97 1500, I would be tickled pink to get 27mpg. On a good day with the sail up and a 40 mph tail wind (Which isn't hard to do in Iowa), I get 24 MAX in town.
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post #9 of 29 (permalink) Old 05-06-2009, 10:20 PM Thread Starter
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sandiegobrass wrote:
Quote:
The 1500 is not known for good "mileage".. 27mpg "around town" is perhaps a little low, but a lot depends on how you drive it.. It is not terrible... I have a 2000SE also, and last tank was about 32mpg highway... my 1100 gets 40+... I do think that your CO is too high ( was that at idle?) suggesting too rich... if that was idle, that can be leaned out with the idle mixture screws and will affect mileage particularly "around town" (low power)... and finally, the already mentioned float levels would be suspect to me even if a "reputable" shop did it.. unfortunately that requires a complete teardown to check it... ( I am kinda down on mechanics lately.. my recent experience has been do it myself or pay someone to mess with it before I still have to do it myself.. ) SDB/Jim
I would have done the work myself but time is more important than money these days. But alas, if you want it done right, better do it yourself.
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post #10 of 29 (permalink) Old 05-07-2009, 12:03 AM Thread Starter
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us385south wrote:
Quote:
If you got a 25th edition with only 8K, you got a low mileage bike.

27 mpg. Sounds a bit low... I have a 1996 with about 44k... on the best of days I do 30. I have it up on the stand now replacing the timing belts... Rudy suggested that replace the timing trigger wheel while I was in there... I'm awaiting the part.

For what I can read and understand that'll boost the mileage and power a bit... hoping so anyway...

It will interesting to see how long this threads goes before someone mentions Seafoam.

G'Luck!
I bought it five years ago with 8K and now it has 38K, mostly in-town driving. Let me know how the 4 degree advance wheel works.
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