I was going to post a thread asking about vibration with a ZDZ 60 but you seem to be having a similar problem. I mounted it on a Hanger 9 Extra and started it today. The vibration at low thru med settings was exactly as posted in this thread. High throttle smooths out considerably but there is still too much vibration for my liking. The prop is balanced and the engine is hard mounted. What should I first do? Is this normal for a new gas engine? I thought about changing timing or the low needle setting. This has caught me off guard and made me reconsider switching from glow.

By the way, I spent quite a bit of time trying to get the engine started using "factory settings" to no avail. Turns out the idle speed needle was only one turn out and the high speed needle was maybe 1/2 of a turn out. After resetting these per the manual it started. They are both currently at 1 1/2 turns out.

Thanks,
Chuck