JBA .56, new, during break-in on my test bench. Rpm reading taken during the 5th tank through the engine. This engine belongs to "bigedmustafa" of Omaha, Nebraska. I am breaking it in for him and taking readings.

Fuel: Omaga 10% nitro, castor blend.
Glow plug: K&B non idle bar.
Prop: APC 11-6.
rpm: 12,800 (bouncing between 12,750 & 12,850 with an occasional jump to 12,900.)

Five tanks, five 1-flip starts. Very nice running engine so far.