1. Engine only has 150 hours on it.
2. SB 54A Has been done.
3. Gearbox was just done by Aircore Aviation.
4. Prop has never been messed with as far as I can tell.
I have been chasing this same problem since I got the plane in July- I did not have much Rotax experience- so did not know what was "normal". Since then I have listened to quite a few and mine is not right compared to everyone else. That only leaves the prop- or I am wondering if there is too much spacing in the gears in the gearbox???