i am having some difficulties with my 40hp tracker/force motor. i was shifting quickly between reverse and forward yesterday a few times and all of a sudden the thing starts running half power with full rpms.

whatever position the shifter is in, it is the appropriate rpm for position with half (or less) of the power.

i have read several descriptions of a spun prop and many describe intermittent problems or problems at certain rpms. mine does not seem this way.

what are your experiences with a spun prop?