i bought a nib os 61 sf pumped... it was unused but 15 years of age.. no visible rust anywhere... and i have two remarks... first, i have been unable to start this engine easyly since, because of the pump, its flooded at every first attempt... i finally clamped the fuel ,line to avoid that, is this the good method?
second, i flew for about three hours, and the bearings have always been noisy... then, the engine has quit forever, since a dozen of balls has separate from the bearing, destroying piston, liner.... so, is there an experienced modeler to tell me the best way to start up the engine? what is the signal to replace the bearings? am i unlucky, or is that a well know failure on that engine? best regards to all thouse nice guys.. lionel