I have a G 90 that that I bought new in 1998 (Italian made). It's been in the box since this spring. I finally finished the Topflite P-51 that I bought it for this spring. I followed the break-in procedure with the engine mounted to my test bench. During the break-in I didn't notice the excessive vibration. The test bench probably absorbed the vibration.

I noticed the vibration the first time I ran the engine on the plane. After 30 seconds of running the vibration was so bad it broke the hinges on the rudder. I was using Du-Bro nylon pinned hinges. I brought it home and re-checked the balance of my 12X8 prop and the 4" C.B. Associates spinner. They both balance.

Is it worth sending it in to Hobby Services to have it looked at?

Would I be better off just buying a new one with a warranty?
(or)
Is something I can do to fix it myself?

Thanks for the help.
Al