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Discussion Starter · #1 ·
Just wondering on what everyone thinks about this 4deg timing wheel.

I have a nice running 89 1500, carbs in good working order, and synced up nicely. I'm getting between 27-34mpg depending on speed, load, and how hard I'm twisting the grip.

Whats the thought of improving the fuel milage with 4deg wheel?
I'm already running 93oct gas, seems to like it better.
 

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If it needs 93 octane now to run right (which I believe is mostly in your mind) then if you advance the timing 4 degrees where are you going to find high enough octane?
 

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Discussion Starter · #3 ·
Well I know its all in my head with the higher octane, but I have started using high octane in my lawn equipment and they run better, so I figured I would try it in the bike. The bikes runs fine on the low octane gas. Come to think of it I have noticed no change in mileage with hi octane.

I'm just wondering if its worth buying and spending the time to install the 4deg wheel.
 

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Just wondering on what everyone thinks about this 4deg timing wheel.

I have a nice running 89 1500, carbs in good working order, and synced up nicely. I'm getting between 27-34mpg depending on speed, load, and how hard I'm twisting the grip.

Whats the thought of improving the fuel milage with 4deg wheel?
I'm already running 93oct gas, seems to like it better.
I don't know if the older gl1500's just got worse mileage but my '99 gets an average of 42mpg or so on regular fuel. I do drive very conservatively but 30mpg avg sounds pretty low even for a gunner.
 

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I don't know if the older gl1500's just got worse mileage but my '99 gets an average of 42mpg or so on regular fuel. I do drive very conservatively but 30mpg avg sounds pretty low even for a gunner.
I just don't understand all these reports of 20's and 30's on mpg? I am like you on the gas mileage. I am not what you would call a 'conservative rider' but I get very good gas mileage. I have a 1990 SE with 95000 miles on it and I get into the low-mid 40's if I am on secondary roads and ride the speed limit (60 or so). At 70+ on the Interstates I still get 38 to 40 mpg.
 

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I just don't understand all these reports of 20's and 30's on mpg? I am like you on the gas mileage. I am not what you would call a 'conservative rider' but I get very good gas mileage. I have a 1990 SE with 95000 miles on it and I get into the low-mid 40's if I am on secondary roads and ride the speed limit (60 or so). At 70+ on the Interstates I still get 38 to 40 mpg.
I get about the same as that also on my 94. Don't know why some are getting such low fuel mileage. It seems that the low fuel mileage is mostly from the early 1500s from what I am seeing here on the forum.
 

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I get about the same as that also on my 94. Don't know why some are getting such low fuel mileage. It seems that the low fuel mileage is mostly from the early 1500s from what I am seeing here on the forum.
Not just the early ones
My 99 gets a pretty steady 30mpg the way I ride:grin: not much time below 3500rpm.
The only time I got 40mpg was in a PGR escort of 150 miles set at 65mph on the highway.
I now have to rebuild or replace the vacuum fuel valve with the electric option as it is leaking so that may change the results.
 

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Piaggio MP3, was 02 GL1800
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My '98 is giving me 33-34 just like my older '94 did.

I think most of it is the super tall windscreens and too much throttle.
but, I used to ride mine to work and back everyday in city traffic keeping up with the hotrods in stop 'n go traffic.

now I am retired and not so much in a hurry to go anywhere.
I have not made a long trip since I retired, so am waiting for the next big tank of fuel to be burned.... Little short jogs just don't give good readings.
 

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Discussion Starter · #10 ·
I've gotten roughly the same milage since I've had the bike (Dec 11) I rebuilt the carbs with a Randakk carb kit, replaced ALL filters, replaced alot of the vacuume hoses around and under the carbs. and checked to see if its had the carb jet recall preformed. She idles fine and smooth, (no looping) and when its really cold will need to use the choke to start, in the summer I dont even both with the choke. always fires up. I dont feel any hesitation when I accelerate hard. Plugs look they there ok (nice even tan). The only thing I didnt adjust once I got the carbs back on were the idle jet screws. if I remember I set them 3 turn out from lightly seated. last month I adjusted the carb sync again and all i noticed a little smoother idle and accel from a stop but no change in milage. If I ride it hard to and from work shifting around 3400rpms i get around 27mph. if i'm out on the road steady speed around 65 i get 32-34mph. another guy I ride with that has a year newer ('90) says he gets the same. I've figured my low milage was my riding style???? or is there something I overlooked for my low fuel milage?

ps. from what I can tell the fuel cutoff valve is good, but i'm planning on rebuilding it due to age and milage.
ps1. I also have one of them tall wind screens on the bike - could that have an effect?
 

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fishblock,

as far as I am concerned, what you are experiencing is normal for the way you ride and I used to ride.

I have a spreadsheet made up that documents 3,500 miles very thoroughly. It showed single tank fillups with lows of 27.5 mpg and a single tank high of 40 mpg. Gawd that one tank at 40 mpg was soooo slow I though I would die!!!! I just cannot ride that slow.

The overall average on that spreadsheet was 32.5 mpg and that was for a trip from Tampa, FL to PCB to Houston, to Corpus Cristi, to San Antonio, El Paso, Tuscon and Phoenix and then around the state in Arizona for a couple months.

Figures can lie, and liers can do a lot of figuring. But when it comes to documenting a GL1500 pushing a Tulsa Tall windscreen at 75 and 85 mph, you will NOT get even close to the 40 mpg figures some folks talk about.

40 MPG cannot be done at speeds of 70 mph or more consistently. A tailwind on one tank of fuel? yeah, but over 3,000 miles? no way....


IF you replace that windscreen with one that is 10 inches shorter, you will definitely notice an improvement in your MPG results.



EDIT: adding link for fuel spreadsheet


https://www.yousendit.com/download/M3BtSkhUTSttUUZDaDhUQw


Read the MPG column real close. I just saw that I had a single tank fillup with 45.83 mpg. wow! I really did break the bank there that one time. But, look at all of those other numbers...... When you document closely, you will find out what governs your MPG readings.
 

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It's called air flow against a brick wall!
Below 65 mph will give best mileage. I can't drive 65!
 

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Since it's running well and the plugs look right, I wonder if there's a drag somewhere. Brakes, final drive, underinflated tires, tight or bad wheel bearings. I only got under 40 mpg once that I remember - I think it was 39. I've had 49 on a few tanks and 50 once. This is 2-up on a bike with over 100k miles on it. Another possibility: could your valve timing be off a tad? I sure as hell wouldn't settle for the lousy mileage you're getting.
 

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At what speeds and rpms are you accomplishing this Terry?
 

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Stu - I think I typically run between 2k+ and 3k+ rpm (unless under load). I rarely go over 65mph, anticipate stops and generally do all the things a cheap bustard would do.
 

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Stu - I think I typically run between 2k+ and 3k+ rpm (unless under load). I rarely go over 65mph, anticipate stops and generally do all the things a cheap bustard would do.

Terry,

How you drive is conducive to better MPG. That is not 'normal riding' for most folks.

Most normal folks hit the highway and rarely ever get below 65 mph, I cruise at 75 mph all the time until I get to where I am going. Today is a case in point. I needed to get down to Owasso which is 18 miles from Oologah and on a road that is nearly straight and has a 70 mph speed limit. That means the traffic is running at 75 mph and so was I.

You just cannot achieve 40 mpg fuel economy at 75 mph, it is not going to happen.


my tach is indicating 3000-3800 rpm all through the whole trip. Not counting the taking off and getting up to speed, and the slowing down for turns and stops. This is what produces those 33 mpg normal fuel economy readings.

His bike is okay, nothing wrong with it. I am willing to bet you Terry, that you and he can trade your bikes and ride for a full day and each of you will get the same returned mpg that you normally do for yourselves.


It is all throttle control, pure and simple.
 
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