Hi Dave,

I recently purchased what I thought was a regular .61-R. It turns out that is is actually the AR version with the oiling orifice for the rear bearing just below the carb, machined head and the sealing rings around the crankshaft. If memory serves, wasn't the AR a supercharged style engine with the sealed portion of the crankcase acting like an air chamber providing boost? Is the AR a ringed piston engine (piston looks ringed to me [8D] )? What RPM and Prop sizes would you suggest (came with no paperwork)?

I noticed that several ppl ask you about after run oil so I will be no different , I currently use Valvoline synthetic penetrating lubricant is that ok? Thank you very much for your time.

Aaron