21xz-b

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  1. WoodiE

    OS Engines Speed 21XZ-B Spec III

    O.S. has just released the Speed 21XZ-B Spec III, the successor to the tried and true O.S. Speed 21XZ-B spec.II. The new O.S. Speed 21XZ-B Spec III features a newly designed crankcase as well as piston and cylinder. The displacement of the Speed 21XZ-B Spec III is 3.49cc. In addition a 3-port...
    • WoodiE
    • Thread
    • 21xz-b nitro engine o.s. engine
    • Replies: 1
    • Forum: Engines
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