Online Community of Zenith Builders and Flyers
I do not know the cost of dynamic balancing, but maybe you should do it yourself. Considering all other expenses, the cost a Dynavibe is only around $1,600.
I have dynamically balanced my prop on my 912iS. The amount of balancing needed is dependent on the propeller/spinner you are using. Some props are notoriously unbalanced. My prop/spinner combo was not too bad, but I could feel the difference (improvement). The reason that Rotax wants you to do it, is because Rotax has dual carbs and vibration will cause wear to the carbs which will cause the engine to run rough and vibrate even more. Balancing the prop will not compensate for carbs being out of sync. You must make sure your carbs are sync'ed first or you are just wasting your time (and money). Our club bought a Dynavibe and it has been a good investment. Most everyone has said that they could feel a marked improvement. Makes everything in your plane last longer.
We rent out our prop balancer here at Viking for those that don't want to take the plunge and buy one. -Alissa