Author Topic: Gas Mileage (Read 23898 times)

rab1dwolf · « **Reply #125 on:** June 13, 2006, 09:30:49 PM »

just a thought im running a 4-1 mac exhaust and stock air box. what about you other guys with the godly mpg?

huntman58 · « **Reply #126 on:** June 13, 2006, 11:05:55 PM »

4 into 1 header ( Kerker) uni air filter ( a red foam one and clean ) carbs sync , bike is tuned , new tires ( Dunlap 404's and loveing them) . other wise stock but the windshield, bags, and trunk, and that darn yeller paint

ya think if it went on a big time diet I could get some better mpg?

Pinhead · « **Reply #127 on:** June 14, 2006, 03:53:02 PM »

Completely stock as far as I can tell. OEM mufflers, stock air box and filter, as far as I know stock gearing. fourth gear is 5k at 50 mph and 5th gear is 6k at 75 mph.

cb650 · « **Reply #128 on:** June 14, 2006, 04:04:41 PM »

Dad got that milage when his bike(s) were new and stock. I went with a 1 tooth bigger front sprocket and 4-1 headers and unies. Although the stuff never helped the MPG as I started with them stock for a time also.

Terry

babyfood1217 · « **Reply #129 on:** June 14, 2006, 04:15:17 PM »

Ever since the middle of May, I have been regularly checking/comparing my mileage, and this is what I figured...
65mph @4,000 rpm = 47.5 - 50mpg
stock gearing, occasional rowdiness (gotta get the ton in on the long straight away country road), totally tweeked exhaust (probably rather restrictive - for details on this, see my bike) http://www.sohc4.us/forums/index.php?topic=10783.0

I'm pretty happy with the mileage. When I was taking the interstate to and from work everyday, I was getting only 35-37 mpg, and I know it is only between of my heavy throttle hand. Something about keeping up with the 80mph traffic just reaches out and grabs yah...

Anyhoo, all this is with my 1976 cb750k

-Chris Gerber

74cb750 · « **Reply #130 on:** June 14, 2006, 04:52:54 PM »

Well, I was told by my brother before I bought the 1976 cb550 that it was all tuned up...
still getting 35-37mpg
and it still starts hard when cold. Still trying to figure that one out.

Anyways, will recheck the points/plugs/valves etc before heading up to the races
in Loudon, NH and recheck the gas milage then.
peace,
michel

Green550F · « **Reply #131 on:** June 14, 2006, 08:00:40 PM »

60MPG! No #$%*! Really! Oh, wait, that's the wife's Helix. $:-\$ Sorry got excited...

Bodain · « **Reply #132 on:** June 14, 2006, 08:11:11 PM »

Quote from: rab1dwolf on June 13, 2006, 08:54:22 PM

im hoping to do those three things maybe this weekend after seeing nacho libre.

the carb sync however is going to be done by my friends ear since we dont have the tool. I'm told he does a good job of it

I think your friend has way too much confidence in his ear. If I were doing it by ear. I would get a dog.

rab1dwolf · « **Reply #133 on:** June 14, 2006, 08:57:28 PM »

quick question do you burn more gas at a lower gear/higher rpm or higher gear/lower rpm?

Pinhead · « **Reply #134 on:** June 14, 2006, 09:20:03 PM »

Quote from: rab1dwolf on June 14, 2006, 08:57:28 PM

quick question do you burn more gas at a lower gear/higher rpm or higher gear/lower rpm?

I'd say you're optimum will be inbetween somewhere. The engine has an optimum RPM (where the torque and RPM curves meet) and that's where you'll get the best mileage. Generally, though, the higher gearing the better. Look at the Crown Vic's and stuff. 70mph is around 1200rpm and they get 30+mpg.

rab1dwolf · « **Reply #135 on:** June 14, 2006, 09:42:50 PM »

so i geuss riding at the 7,000-9,000 rpm isnt too great for the mpgs then...

Pinhead · « **Reply #136 on:** June 14, 2006, 11:05:12 PM »

Probably not. Unless your engine has no low-end torque. If you've got to have your throttle 3/4-open at 3000 rpm at 70mph you'll probably get worse mileage than if you're 1/2-open at 6000 rpm... I say probably because I don't have different sprockets to test.

rab1dwolf · « **Reply #137 on:** June 14, 2006, 11:07:11 PM »

it supposed to be nice tomorrow so i suppose i shall test it and see:)

this weekend looks like its shaping up to be a good weekend to do the valves/timing

Bodain · « **Reply #138 on:** June 15, 2006, 04:50:58 AM »

I never get involved in miles per gallon talk. All my life... No matter what I drive. I never get as good milage on anything as others do.
1975 CB 550... Others have claimed 45... I could only get 35 on a good day.

1965 Honda Super 90 I got about 70 other claimed 110.

2001 Kawasaki ZRX 1200R I get about 36. Other claim 50.

1999 Dodge Truck 360 engine I get 12 Others claim 19.

It's been that way since I started driving many years ago. So everyone else is using fuzzy math or I just don't have the milage gene.

Bob Wessner · « **Reply #139 on:** June 15, 2006, 05:02:25 AM »

I periodically check mine as a relative indicator of how things are. Any noticable change suggests a closer look at something.

dusterdude · « **Reply #140 on:** June 15, 2006, 05:10:14 AM »

bodain,whoever told you 19 mpg on that dodge,was lyin to ya.

lakeboi · « **Reply #141 on:** July 20, 2006, 12:34:36 PM »

I may try the same thing....just rebuilt a '73 500 and its getting about 34mpg. Have not checked the timing with a timing light yet or adjusted the cam chain tensioner and valves (other than initial setup). I am running a 4-2 exhaust and the bike sounds extremely loud coming down the road. I have been getting a lot of backfiring in the right exhaust and it sounds like its running very rich. The bike cold starts without a problem....requires a little choke and about 20 seconds of half choke.

TwoTired · « **Reply #142 on:** July 20, 2006, 01:13:05 PM »

Quote from: lakeboi on July 20, 2006, 12:34:36 PM

'73 500 and its getting about 34mpg. (snip) and it sounds like its running very rich. The bike cold starts without a problem....requires a little choke and about 20 seconds of half choke.

Soot in the tail pipe? Yup, you're throwing gas away. I imagine your plugs are dark, too.

Ibsen · « **Reply #143 on:** July 20, 2006, 02:54:21 PM »

1980 CB650. An average of 51mpg, have seen 56mpg on long trips.

1975 Kawasaki KZ400 twin. 63mpg.

bowhunter · « **Reply #144 on:** July 20, 2006, 08:14:58 PM »

77K7 overall 47-52 MPG mostly city driving, but I don't pound the throttle. 50-54 MPG straight highway 55-65 MPH

Bowhunter

seaweb11 · « **Reply #145 on:** July 20, 2006, 08:21:23 PM »

78K 150 miles per tank

amattel · « **Reply #146 on:** July 20, 2006, 10:07:39 PM »

72 750k2 bored out to 836 with 31mm cv carbs and pods and 4-1 exh I get 40-43 mostly

Adam

SteveD CB500F · « **Reply #147 on:** July 21, 2006, 12:42:24 AM »

1972 500/4 45mpg-ish that's about 100 miles to reserve

2001 VFR800 50mpg when I use all 12k rpm, 60mpg when I use "only" the first2/3 throttle

That's a minimum of 200 miles per tank

Note UK gallons boys...

rt · « **Reply #148 on:** July 21, 2006, 03:53:41 AM »

78 550K3 - 42 mpg (US), ca. 50.5 mpg (GB), commuting to and fro work. Mix of city and country roads.

DJ_AX · « **Reply #149 on:** July 21, 2006, 06:01:39 AM »

I'm getting 55mpg on my '75 750K5!
I was super phsyced when I did the calculations and found that out.
Way better than I expected. Had to check and re-check and ... yup.

Stock gear ratio... gettin' heavy on the throttle now and then...
about 40% mellow freeway ridin' at 65 to 75mph.
And as much as I've been riding... (2,500 miles in the last two months) I figured that by the end of the summer the money saved in gas will have paid for the bike! Including insurance and all of the parts I've bought for it so far!

News:

Author Topic: Gas Mileage (Read 23898 times)

huntman58

lakeboi

Ibsen

bowhunter

amattel

rt