What a concept - A Girl Bringing Back Her 1966 Super Hawk
Ummmm....! Superhawk (I've seen Super Hawk in print, too). :) 54 mpg? I'll have to see what she really is doing right now. I don't remember what she used to get way back when. I didn't worry about such things in the days of $.35 per gallon gasoline. I used to put Sunoco 260 in her, in fact. 1965 CB77 305 Super Hawk
1989 NT650 Hawk GT 1981 Yamaha XJ550 Seca My CB400F used to do 65mpg (British gallon - 4.5 litres) and my Ford C-Max 1.6 Turbo diesel does pretty much the same on a run; 55mpg around town.
Of course we have to pay £1.35 a litre for the precious stuff. That's £6.13 a UK gallon or $7.84 per US gallon...... :-) G '60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
Graham, regular is $4.13 per gallon around here right now. I think the oil companies are trying for the same price worldwide. Oh, and the governments are trying to make up the difference by taxes. My Prius (not so much fun as your C-Max, I'd bet) is averaging 48 MPG over 800 miles. I can see 50+ around town and 49 or so on the freeway. I like that! I wonder if the Old Girl is running a bit rich or if she's just new? I'll ride her around some more and she what she does. 1965 CB77 305 Super Hawk
1989 NT650 Hawk GT 1981 Yamaha XJ550 Seca If it's a tad rich, I'd let it be until break in is over. I was mostly curious if Jensen's mileage was being cited for a Hawk (250cc) or a 'hawk (305cc). It might stand to reason that a smaller engine gets better mileage, though I'm not sure about that if the bike the smaller engine is lugging around is the same size and weight as the one the 305 has to lug around. But I do think a Mustang with a 6 gets better mileage than one with a throaty V8, so...
At any rate your efficiency might go up once the break-in is done and the oil has been changed. That's what I'm hoping for with our Dream. It'd be nice if the 305 would get better mileage than my 750 Four... Mine: '74 CB750 K4 -- Hers: '64 CA78
Had: '75 CB550 K, '79 CT90
LOL!!! I totally get that, Bob! My SV650S, 2006 model (I think it was) got 60+ MPG. Just silly. But then, it was liquid cooled and fuel injected - very efficient. The new SR400 Yamaha is touted to get 66, and it is also fuel injected. I would hope to expect at least 50 from the Old Girl, but she's carbureted, and she might not do that. As far as I know, the CB72 and CB77 were virtually identical, save for engine displacement. 350 pounds with a smaller engine? I don't know!! 1965 CB77 305 Super Hawk
1989 NT650 Hawk GT 1981 Yamaha XJ550 Seca
Although I remember my first Superhawk used to get around 45 MPG, I have kept a record over the last 2600 miles and the average is 53.9 MPG. Coincidentally, this agrees with Jensey's.
Re "running out of gas" at speed. It's probably a clogged gas cap vent, as you think. But, my bike seized trying to keep up with some faster bikes on a long climb into Randsberg (Mojave desert) 3 weeks ago. (One of my spark plug electrodes was missing, melted back to the center insulator from the heat!) After I changed the plug, I retarded the timing "a bit" and babied it home, where I discovered the spark advance was about 10 degrees past the full advance marks when revved up, even though it was right on for static timing. Be sure to check the timing with a timing light at full advance, as the experts recommend.
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