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    ROTAX 277F PORT DURATIONS?

    From the other 277 thread, Stock Intake Duration was 180. Using this Calc. http://www.csgnetwork.com/timingportdurationcalc.html Measured Stroke = 66mm Connecting Rod Length = 120mm Port Height Above BDC = 28.3734mm for 180 Duration. What is the Exhaust Duration?
  2. A

    Wanted Rotax 277 with CDI

    Rotax 277 cranks Any body know if someone makes any Skidoo/Rotax 277 Cranks? Stock Stroke is 66mm, would also be interested in a 70mm Stroker also. Thanks Rich
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