You missed one difference: The Dream had a 360 degree crank and the Superhawk had a 180 degree crank. I also had a 1960 domestic Dream (one that was not for the USA). It had a dry sump engine and high exhaust - yes, it was a 305 Dream.
Although you did point out that the bottom end of the CB77 engine was different, one of the chief differences in the sound as well as the performance of the two engines is the crankshaft configuration. The CA has a 360 degree crankshaft, with both pistons rising and falling together, but firing on alternate rotations. The CB has a 180 degree crank, with the pistons at opposite ends of the rotation. The two engines sound totally different. The CL77 Scrambler version also used the 180 crank. Another fun trivia fact - the Super Hawk used a fairly rearset footpeg location, which would have interfered with the kickstart arm. They redesigned the whole right side cover and mechanism so the kickstarter arm kicks to the front instead of the rear.
With a 360° crank, the intake strokes are a regular distance apart. A 180° crank gives uneven intake intervals, and would result in uneven fuel/air intake. So a twin carburettor system is necessary with a 180° crank, or a 90/270° crank as on many modern parallel twins.
@@pashakdescilly7517also of course,the twin gives better fuel/ air flow into the engine with two air filters as well , and two ignition coils , as the spark becomes weaker at high rpm , I had a CB72 from almost new when a service was due I booked it in for a service , on collection the ride home was a bit lack lustre, I built myself a simple timing light and adjusted the points not for the 5Deg advance but full advoance where it would be ,when running at speed due to the advance retardant mechanism, after which it performed very well, tick over was not so good ,possibility because the wear tolerance of the mechanical mechanism involved , which relies on springs and weights not exactly high tech, no doubt it’s done differently in modern electronic systems , where the dwell time is not important !
Back in 1974 I bought my brothers CB77. He wasn't riding it much and had just replaced the exhaust. The $60 I paid was a lot for a 17 year old still in school. I anticipated a condition worse than it was and pulled the head. In shop class I put the exhaust valve to the belt sander to removed the carbon and was too aggressive. Much to my shock that valve was $10 (5X minimum wage back them). Once I got it running I would often be found running 2nd gear up to 55 MPH at 9K RPM. Dirt bikes were all the rage back then and while the CB77 wasn't "your grandfather's Oldsmobile" it was "your older brother's former street biker." That said, a friend who was into dirt bikes was totally shock at how hard it pulled in 2nd gear. The torque curve and gear ratio were WELL matched. One of a handful of well remembered motoring experiences in my 50 years of possessing a drivers license was hitting 2nd gear on the CB77 and cranking the throttle. 🙂
I have a1962 cb72 ,a blue one not as nice as your cb77 though😁 . If you dont mind me asking , 😂where did you get your stainless mufflers/silencers from, they look great !
I have both, a '68 CB77 Superhawk in black, and a '64 CA77 Dream in red, now undergoing restoration. Great bikes, easy to own and maintain! I get a lot of comments with the Superhawk, it's a chick magnet too!However, parts availability can be tough, and reproduction parts quality can vary widely.
You missed one difference: The Dream had a 360 degree crank and the Superhawk had a 180 degree crank. I also had a 1960 domestic Dream (one that was not for the USA). It had a dry sump engine and high exhaust - yes, it was a 305 Dream.
Although you did point out that the bottom end of the CB77 engine was different, one of the chief differences in the sound as well as the performance of the two engines is the crankshaft configuration. The CA has a 360 degree crankshaft, with both pistons rising and falling together, but firing on alternate rotations. The CB has a 180 degree crank, with the pistons at opposite ends of the rotation. The two engines sound totally different. The CL77 Scrambler version also used the 180 crank. Another fun trivia fact - the Super Hawk used a fairly rearset footpeg location, which would have interfered with the kickstart arm. They redesigned the whole right side cover and mechanism so the kickstarter arm kicks to the front instead of the rear.
Thanks for the tech info. Fixnride
With a 360° crank, the intake strokes are a regular distance apart. A 180° crank gives uneven intake intervals, and would result in uneven fuel/air intake. So a twin carburettor system is necessary with a 180° crank, or a 90/270° crank as on many modern parallel twins.
@@pashakdescilly7517also of course,the twin gives better fuel/ air flow into the engine with two air filters as well , and two ignition coils , as the spark becomes weaker at high rpm , I had a CB72 from almost new when a service was due I booked it in for a service , on collection the ride home was a bit lack lustre, I built myself a simple timing light and adjusted the points not for the 5Deg advance but full advoance where it would be ,when running at speed due to the advance retardant mechanism, after which it performed very well, tick over was not so good ,possibility because the wear tolerance of the mechanical mechanism involved , which relies on springs and weights not exactly high tech, no doubt it’s done differently in modern electronic systems , where the dwell time is not important !
Back in 1974 I bought my brothers CB77. He wasn't riding it much and had just replaced the exhaust. The $60 I paid was a lot for a 17 year old still in school. I anticipated a condition worse than it was and pulled the head. In shop class I put the exhaust valve to the belt sander to removed the carbon and was too aggressive. Much to my shock that valve was $10 (5X minimum wage back them).
Once I got it running I would often be found running 2nd gear up to 55 MPH at 9K RPM. Dirt bikes were all the rage back then and while the CB77 wasn't "your grandfather's Oldsmobile" it was "your older brother's former street biker." That said, a friend who was into dirt bikes was totally shock at how hard it pulled in 2nd gear. The torque curve and gear ratio were WELL matched. One of a handful of well remembered motoring experiences in my 50 years of possessing a drivers license was hitting 2nd gear on the CB77 and cranking the throttle. 🙂
I had Dream bullit proof engines. However rear fender split from viberations. Thanks for the memory.
I have a1962 cb72 ,a blue one not as nice as your cb77 though😁 . If you dont mind me asking , 😂where did you get your stainless mufflers/silencers from, they look great !
I have both, a '68 CB77 Superhawk in black, and a '64 CA77 Dream in red, now undergoing restoration. Great bikes, easy to own and maintain! I get a lot of comments with the Superhawk, it's a chick magnet too!However, parts availability can be tough, and reproduction parts quality can vary widely.
Beautiful machines, wish I had one.
I bought a 305 Superhawk in 1967, like it alot. Lost it in a fire.