interesting engineering

[100hp honda]

its different from what ive seen before anyways. pulled the pipe from the 465 and seen there is no exhaust bridge, similar to the old hondas i guess. i pulled the reeds and found no bottom boost ports like the cr500, what i seen was 1 rectangular shaped port on the roof of the intake area. i wonder what the vintage suzuki, ktm, kawasaki and maico bikes motors looked like . you can kind of see it where the red line is

[redrocket190]

....same thing on the 1979 Honda CR250R cylinder. It's an additional transfer port fed directly from the intake tract rather than the crankcase. The 1979 is bridged, the 1978 is a single large combo port.