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Why do you think the OS .91 has more displacement than the MVVS .91 ?
The displacement is the same no matter whose engine it is , a .91 is a .91 .
The MVVS .91 is one of the most powerful 2 strokes available and will swing
a very large prop as it is a long stroke engine and has tremendous torque at
low RPM's , this makes it a very good pattern engine.

tommy s