OS Engine - OS max 40 SF - RC motor

This engine is from the estate of a keen aeromodeller but had not been used for a number of years. Fuel had dried leaving a varnish that had locked up the engine. Engine dismantled and cleaned with lacquer thinner. Bearings oiled, engine reassembled and mounted on a test rig and fired up. The new glow plug installed was used to run the engine on the test rig.