The engine responds well to muffling and is very quiet. The engine starts more easily if it is "quite wet", which make sense for sealing. Displacement 5 cc, 0.30 ci RPM 2500 to 18,000 rpm HP 1.27 bhp Weight 11.8 oz Fuel Low nitro content (ex. Cox blue, 15% nitro) 20% oil. Prop 9-6 (wood) [can try 9-7, 10-6]. Plug Standard long reach Glow Plug such as long reach K & B. Engine Dia. 2.775 in Engine Len. 2.590 in (fr thrust washer to rear eng. mount plate).
It has a standard glow plug and may need to be replaced. The engine has good compression for a rotary and has been sitting in oil for last 40 or so years.