The specific motor is an Elto Ace, 1938, 1.8HP, model 4256, one piston. It uses two bronze sleeve bushings, one above and one below to seal the crankshaft. I measure the crankshaft to be about 0.001" to 0.0015" smaller than the ID of the bushings. There are no other seals. Is this too much clearance to seal properly? I am also investigating low compression and weak spark as part of a low speed running problem. I have to spin the crankshaft with a drill motor to get the motor to start. It runs fine at higher speeds but will stall at near idle.<br /> Any help is greatly appreciated.
