Interesting... was the engine vibration spread out over a wide range of rpms, or did it occur only at one engine speed?
I dug through my 14 -16 inch prop box, but no 14 x7 so will order one.
The long stroke was the reason I wanted to try this engine. The MVVS instructions recommends 13 x 7, 13 x 9 or 14 x 7 but adds "(Use
lighter propellers with standard silencers so that the engine will be able to reach at least the RpM listed above.)" The minimum rpm is 10,000.
I won"t mind turning less than 10K if it solves the vibration.