Vivo brings up an old question I asked in the 60s: Why did they bother with a 305? Both Honda and Yamaha did it. I get 250, 350, 500 and so on but 305?
You guys really march down memory lane and I thank you!
Karl
There was a 250cc variant and a 305. They made a 305 so that they can just rebore the existing 250cc block and not make a totally new big 350cc. Besides, the 305 was the biggest Honda in the early 60's... apart from the tank badge, they are externally identical, and internally differ by a mere 55cc. What is the point of building two machines so much alike that they vary only in cylinder bore dimenÂsion and, slightly, in the ratios provided by the four-speed gearbox? Where does the extra 55 cc count on the CB77? The 250 produces 24 bhp at 9,000 rpm, whereas with its extra 55 cc, the CB77 pokes out another 4 bhp, which in terms of perÂformance means some 5 mph additional top speed. It is also interesting to note that the power band is wider on the 305, with maximum torque of 18 ft/lb at 7,000 rpm, compared with 15 ft/lb at 7,500 rpm from the 250. This means that the CB77 is more flexible than its 250 cc counterpart and, with more urge lower down, acceleration is also slightly better than with the CB72 250cc.
Yamaha came out with a 305 in 1965, after Honda in 1961... It was their first big bore also...
With my two brothers on the Honda C77...