O.S. .21 XZ-B Speed

O.S. is ready to put another engine on the shelf for you to buy.  The .21 XZ-B Speed has all kinds of new features on it.  The fuel efficiency of this engine has been improved by 8% over the non-speed version .21 XZ-B.  The cylinder head had been made 9mm shorter than the .21VZ-B Speed, the center of gravity has [...]

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