Tony,
I had a similar problem with my 914 / Airmaster setup. I had the propeller
balanced which made a big improvement, but didn't completely remove the
vibration. I since balanced the carburetors with a pair of vacuum gauges
and it runs as smooth as a sewing machine.
If that doesn't work I'd suggest you check the blade angle with a
protractor, sometimes they are a bit out and it can cause a resonating
vibration. Unfortunately these angles are set by Airmaster in a jig so if
they are wrong it is a trip back to the factory for the blades.
Paul
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