RE: DA50- Anybody Having Trouble?
Don't worry about the 22X8 Zinger ... thats not the problem ... I used the same all summer on a Patty Wagstaff.
Was only using 1/2 to 3/4 throttle most of the time ... only full throttle on some vertical maneuvers.
I orginally used it to hasten break-in by getting the RPM up.
Maybe not the best prop ...
I too had to send my engine back after a few gallons, hard to start. (Last Year)
They changed the ignition module, and the mechanicals you mentioned.
Ran all summer without a problem.
When I talked with them (phone), they indicated that a problem showed up with the bearings allowing some fore/aft motion. They were changing other components as a precaution.
I did notice some fore/aft motion of the crank before I sent it back ... but not now.
I ran at least 8 gallons of fuel thru it this summer.
Good luck !