That sounds like real respectable numbers. I know I would be pretty happy with those numbers. My stock "Zama carb" Ryobi 31 spinning 18x6 APC runs in the 7200 neighborhood on 32:1 give or take a few hundred RPMs depending on the day. My concern regarding trying to gain RPM by modifications is that from everything I have read....the stock piston rod is only good to handle 8000rpm or less. Would sure be nice to see someone build a low cost solid billit aluminum rod and then I would really be open to modifications like better porting, Bowman rings, larger throated carb, less restrictive exaust, etc etc .