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Hello I have a GS750 1976 and have cleaned carbuators and replaced and went through the over head cams and changed oil and filter, replaced the fork seals with new oil and new air filter and new fuel pitcock and new tires and still can not get anything but 32 mpg. I hope someone can help as I would sure like to improve the mpg, I just spoke to a man riding a Honda 750 1981 and he is pulling 83 mpg so any help please respond, thank you.
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I'd put money on that guy being a liar...
I've gotten mid/low 30's on my 750 before, with some, um... "spirited" riding. Usually get around 40.
Have you checked your valves? -
change your gearing; go smaller in the rear or larger in the front. Try searching threads for gearing, there might be some suggestions!Comment
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He's DEFINATELY a liar. If he's pulling 83 mpg then he's not going to be running long because the bike is lean as hell. YOU need to check your jetting. What colour are your plugs? how does the bike run? What size sprockets are you running? Etc etc etc. There are MANY variables involved in fuel economy on these bikes. Small, seemingly insignificant changes can change fuel mileage drasticly. So can the amount of wrist you put into the bike. I can manage around 45MPG, two up, cruising at 65mph on my 1100, with the stock gearing. Bump the teeth down a couple on the rear sprocket, and ive squeezed out 50MPG on the highway at 65. At 75MPH, my fuel economy goes down as much as 10mpg. The 8v motors arent QUITE as efficient as the 16v motors, but 32mpg is still a bit too low. Check your pilot circuit ie your air and fuel screw settings. This is where MOST people who cruise spend most of their time in the carbs. This is also the circuit where a small change can have a large effect.Originally posted by armstrong View PostComment
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No way he's getting 83 mpg out of a 750, maybe 38 mpg. It's pretty common to get in the high 50's with a 550cc but the 750's usually will get low to mid 40's.I just spoke to a man riding a Honda 750 1981 and he is pulling 83 mpgComment
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After I cleaned the carbs I had a motorcycle shop mercury sink the carbs and the man said to do the overhead cams so I did them. He said timimg as well but I have not done that yet, the spark plugs are three years old now and one was dark oil looking.Comment
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Well THAT guy at the shop did you no favors. Ideally, sync should be performed AFTER a valve adjustment, as adjusting the valves will have effect on vaccum pull. So basicly he took your money, because now your sync might be a little off. When you say the plug was dark. Was it oil or gas? Oil will be black and shiny, gas will be black and fluffy or chalky. If you are burning oil, you have other problems to deal with than fuel mileage. If youre too rich, and the plug is gas fouled, that will explain part of your problem.Comment
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The spark plug was oil as it was wet and wiping it with a rag it cleaned up quite a bit, yes so the vacuum is off but oil probably bigger issue.Comment
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83 mpg
I have a friend, a reliable source, that can claim near 80 mpg with his Honda Rebel...but only if he goes to extreme measures to improve mileage. He will kill the engine as he's coasting down hill or coming to a stop at a red light. Then he'll roll start it if it's a hill or use the electric starter to restart it as the light turns green.
And I believe him when he claims in the low '80s. But that's a 250cc Rebel, and doing things I'd never do just to save a few pennies in gas. He also admits that it's very rare that he gets that kind of mileage because he rarely goes to those extreme measures.
80MPG on a 750? Sorry...I don't buy it.Comment
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Originally posted by LarryA_Texas View Post
my mothers 250 rebel gets 75-80mpg
just filled it up the other day for her, $3 to fill it up hahaComment
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Liar????
I wouldn't be so rash as to call the '83 MPG Honda guy' a liar
. I don't think there's a chance in the world that he's correct but, geeee, can't we be a little more charitable than that???
A lot of people get terribly mixed up when it comes to simple math so let's lighten up a couple of notches; I'm sure he meant no harm.
1980 GS1100E....Number 15!
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I have had odometers that ring up a lot more miles than they should, this may be part of his math error. I would believe 50 something, 60 possible, yeah maybe, but not 83.
On the other hand, if anyone made a bike that was designed from the bottom up to be efficient instead of fast, they could do this easily.Comment
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I would bet it is just a typo 38 mpg is realistic for a 750. I would turn the fuel screw in about 1/8th a turn - screw on the bottom. Should be 5/8ths turn out from lightly seated. Finish tuning with the air screws on the side of the carb. When I ride some what conservatly I can get 36-38 mpg. I have got as low as 25 when working the gears.
Which plug is black ?? #3 would indicate poss bad petcock. Also check your coil voltage-weak spark can effect milage.Last edited by Guest; 07-28-2009, 07:30 PM.Comment
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I get 65-70 mpg on my 250 Nighthawk, which is essentially the same engine as the Rebel. My 650 Nighthawk gets about 50, and my 750 GS gets about 40. I doubt a 750 can get 80+ mpg without being trailered.
Oh, and my 1.9L Jetta TDI gets a consistent 43.
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Getting back to the question at the beginning, you want to increase your mileage, stock airbox, stock exhaust and don't whack it wide open and run it to redline
OK, whack it open and redline it once in a while and you can still get decent mileage.
Tune it up check the mixture to see if it is rich and you should get up higher.
I get 60mpg on my bike but it has to be on the highway at a steady speed that is how I get up there.
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