[Flyinrazrback]

I have not had the 160 myself, I helped a local guy with one on a 2m funtana, sweet engine. Not sure about the vibration problem, the only thing I can think of is to use a heavy prop to help dampen out the vibes. They really need a soft mount, but not an option on your profile. You might be able to mount some dampeners or such below the motor, not sure though. What fuel are you running?