I agree, case reeds are a heck of a lot better than cylinder reeds, which, themselves, are leaps and bounds better than piston ports.
BEST setup for a triple was used in a prototype I rode in very late 1971, Japan. This engine was air cooled, had the primary take off between right and middle cylinders, large transfers, and 3 ROTARY valves. The carbs were behind the cylinders, and the two outside rotary valves were faced out. Center valve was a two piece thing, mounted on the crankshaft after the crank was assembled, holder ring set into place to hold the valve itself together, and in place.
The cases had the center rotary valve channel and intake port for the center cylinder expertly cast into them. The rotary valve passage on the left of the center cylinder, and the primary drive on the other side of the center cylinder left it will giant teansfer passages, 6 of them. Well done. The transmission was a cassette, very advanced for that day, and the case split was horizontal, much like later Yamaha TZ V-twins. Seems the engineer for this engine went to work for Yamaha.....after the previous company folded, just 3 months after I rode this prototype.......
BRIDGESTONE. It is my hands on opinion that if they had built this 650CC triple bike, we'd be riding, and hopping up this design, and its later variations, instead of as much as we do on our Kawasaki triples. It handled well, stopped like no StoneBridge before it, had dual front disks, rear double leading shoe drum brake, cantilevered rear shocks, much more. Only things I thought back then that would help would have been to make it larger cc's, liquid cooled, and rear disk brake. Never did get a picture of either of those two prototypes, my loss.
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