This engine has further evolved as O.S.'s flagship engine, and by revising the shape of the 9-port cylinder, the output characteristics in the mid-range have been improved.
The cylinder liner uses a new 9-port shape, and by revising the port shape, power in the mid-range has been improved.
The crankshaft uses the well-established EURO2, and in combination with the rear bearing that uses ceramic balls, it improves the feeling even at low speeds.
The connecting rod has also been changed to a stronger type. The carburetor has been revised to make it easier to adjust during races.
It has been reborn as the O.S.SPEED R2106, which can give you an advantage in races.

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