Expected rpm on 120ac

[Del Rykert]

Would appreciate opinions.
 
I have a YS 120ac that has been a strong runner in the past. Would turn a 15x12 apc 8300-8400 on 25% powermaster. It was rebuilt last season but never run till this season. It was giving me fits at Hamburg contest and taching is only showing 7800 to 8000. Needle 1 1/4 out. Seems to spit more fuel out of air inlet than I used to see. 
 
My question being am I being unrealistic expecting it to continue to give me 8300-8400 on that prop & fuel. Valves check at 002 piston TDC cold. Good seal in valves. Don't feel any drag from bearings but I replaced bearings last time and was surprised on ratty they were after dis-assembly. Might my bearings be the culprit and next item to explore?
 
TIA for all who reply.
 
  If you choose to reply off list...   drykert at rochester.rr.com 

     Del K. Rykert
     AMA - 8928 
     NSRCA - 473
     Kb2joi - General 

 
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