fuel economy

Just went on a ride today with MnMaxim and PainterD.

When we stopped for gas, I had gone 135 miles and it took 2.7 gallons. Which was 50 MPG. Not too bad for riding two up, getting up to 88mph on one stretch, rest was cruising around 50-55 mph.

What a nice ride!!

Thanks guys!!

 

On a trip yesterday of 225 miles, I got 50 MPG running on the freeway most of the time at 65-75 MPH.

 

Ok, from what you guys are getting for mpg, I am burning too much gas ! It's always the carbs isn't it
I will get an order ready for parts so I can clean and rework all 4 carbs and I can start wrenching on the first rainy weekend.
Thanks for the comparisons !
Eric

 

On my breckenridge trip I got as good as 67 with the wind at my back and 33 with the gale force wind in my face. An average of all three fill ups was 49mpg. That was going 65 or so. The Denver trip today I got an avaerage of 47 at 70mph. Not too bad. Around town avarage is 43. I think the windscreen helps a lot.

 

I am very happy with my fuel econ. considering, right now in SC, the gas price is $3.73/gallon.

I regularly get 42 - 45 MPG. It's all highway since this is my commuter bike.

Usually, it drops to three bars on the fuel gauge at 55 miles, and I usually get 140 miles before I have to turn to reserve. At this point, I put in ~3.5 gallons.

And to top it off, I think valve 2 is running rich.

 

Damn.
I get 35 mpg, I don't understand how folks are getting 45-50 mpg.
Does riding style really make that much of a difference?

This guy went from 65 mpg 8O to 33 mpg in one trip.
Doubling his mpg and around town 43.
:?:
Around town, back and forth to work, I usually shift at about 6000.
Could this be the culprit?
I'm taking a trip in 2 weeks lets hope for better milage.

 

I tend to shift when it feels comfortable, but usually don't wait that long to shift. More like 4500 or so. I usually cruise at 4500 (65 mph) or 5000 (70 mph), and usually don't get much over that. I usually get about 200 miles before I have to go on reserve when on a trip, 170 around town. I get about 45 around town in stop and go driving. Living in the mountains, my mileage probably isn't quite as good as I could get a sea level. My 750 RK does have a fairing and I think that makes a difference.

 

Actually first fill up was 47. Second was 33 and last fill up was 67.
Yes it really went to 33 MPG. Head wind was terrible. 40 mph wind gusts and climbing up the 11000 foot mountain pass did not help a bit. I was also amazed by the 67MPG on the return trip. But the wind was at my back and I didnt go faster than 65. I was in no big hurry. On the Denver trip yesterday, on the way there I got 47 mpg.
I generally shift around 4,000 rpm. It just seems to like to shift there.

 

I haven't really done the full calculations on mine yet, but I estimate I was getting about 30 mpg before Samsr did the carbs for me. I will post soon with a more accurate figure in the near future. I went for a short ride today and the power improvement was unbelievable. I know the economy is going to go up 'cuz my driving style will have to change. Can't go WOT all the time now!
Thanks Randy.

 

I watched where I was normally shifting on the last leg of my trip and I am shifting somewhere between 3 and 4000 RPM depending on the conditions. Not quite as high as I thought I was. Just did and average on the 3 fill-ups on my trip of 531 miles. This is freeway driving up to 70 plus, some mountain roads and some city driving. My average mileage was 50.6 .

 

Bad fuel mileage might be worn rings or engine problems. Can't do any harm to have a compression test or a leak down test in each cyl. to see what is up. On my old seca turbo engine, it was hard to start and took forever to warm up. I switched engines and mileage went from low 30's to 47 mpg on the turbo when I am not on boost. Cant hurt to look into it.

Sean

 

Make sure that you aren't leaking gas by the Enrichment Valves not being seated closed.

The activation rod on many of the carbs I've had in here for cleaning have been rusted pretty badly.

If that rod doesn't allow the Enrichment Valves to seat closed ... you'll be wasting lots of gas.
In the same vein, check the fingers of the lifters to those Valves.
On bikes where the owner had smashed the Enrichment Valves open,, they bend ... or, ... cause the Top Hat to be bent binding the Valve open.

 

Around town I usually shift by 3,000 RPM, no later than 3,500 if I am just commuting to and from work and usually am in 5th gear at anything above 35 MPH. I couldn't tell you what my milage is though on the last tank since the trip odometer did some weird things when I chaged the forks out. I only drive 7 miles a day round trip as part of my work commute so I can go about two weeks on a tank of gas if I can get 100 miles to a tank.

 

I put about 100 miles on my Seca on sunday I was at 153 miles when I left work this AM. Bike bogged and sputtered as I was leaving so I switched to res. and rode home.
165 miles on it when I added 4.003 gals at the station just down from home.
I rode the bike fairly hard most of Sunday just cause it was the first time I had a chance to enjoy a ride and see what she would do after fork seal/bushings, and a good carb cleaning/adjusting.

41 mpg seems OK to me. I will do better on the next tank I'm sure as I won't be twisting the grip so much on my daily rides to work. My commute loop is 7 miles each way, with a 45 mph speed limit, if I can resist the urge to pull 5-6K at every shift I think 45-50 mpg is within reach.

 

Shifting at 4K is about the speed of normal traffic acceleration.
My ride to work is at night so no traffic shifts are at 5500-6000, 15 miles each way.
On the way home in the morning I never get past 3rd gear, as it's not need.
If I shift to 4th, now the bike's coasting at 45-50mph, waiting for the boys to catch on.

 

Here's my last mileage report on the 750 --

Without twisting the throttle off the handlebar, mostly taking it easy around town, 70-80mph highway speeds....... 46.2mpg. This is with dynojet needles/jets, Mac 4-1 exhaust, K&N filter, 87 octane fuel, and a 16" rear wheel instead of the stock 18".

Not bad, I think.

 

Maybe they're running on "E" as well and figure they can COAST to their destination when the go go juice is gone :lol:

 

Ran right at 120mi on the Maxim this week to and from work, 75-85mph on the HOV lane for 70% and 35-45mph in the city for 30% of it. Filled up tonight with 2.724gal. Got 44mpg this week, 44.8 last week.

 

I had a thought.
*stop laughing*
Some where on here I read that the YICS motor was Yamaha trying to maintain the power but get better fuel mileage.
Mine is an '82 650 Seca, so no YICS motor.
The only other '82 I saw on here got 37 and 35 mpg.
Maybe this is why others are seeing better numbers.
Any thoughts on this.