Hi James,
my Dingo with PowerMaster %20 nitro (low visco oil of course

) & 16.5 X 12 W apc prop & hatori header + 698 pipe+ without restrictor !!! ; turns between 8.45k - 8.55k at 3000 ft. from sea level... For break-in 1 - 1.5 galoons of fuel is O.K. If you'll try to fly soo rich ; you will have dead stick landings like me[sm=punching.gif]...This engine did not like to run soo rich , be carefull [sm=thumbup.gif]
Happy Landings
Oscar