O.S. have released some info about the successor of the O.S. Speed 21XZ-B spec.II, the new Speed 21XZ-B spec and the Speed 21XZ-GT. The Speed 21XZ-B spec. III features a newly designed crankcase and piston and cylinder and its displacement still remains at 3.49 cc (and not as 3.46cc like the Speed B2101). The engine head is
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