How do you create two separate airtight crankcase chambers with an inline twin throw crankshaft. Most Japanese engines were simple horizontally split crankcase halves with a drop-in built-up crankshaft.
Excelsior did it earlier by bolting three sections together vertically and coupling two crankshafts together. In 1958 the engine was developed into a 500cc triple that was used in the Berkley sports car.
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