Honda BF50 (5HP), BF5A Outboard Motors Shop Manual 2014, Page 50Get this manual
SF50SF5A bINSPECTION OIL PUMP
1) Connect an oil pressure gauge (7-10 kgem) to the oil pressure switch2) Warm up the engine and measure the oil pressure when the oil temperature is 90C (194F)ENGINE RPM 1,300 rpm 5,000 rpm OIL PRESSURE AT 90C (194F) 0.6 kgem (8.53 psi) .3.0 kgem (42.66 psi)
3) If the oil pressure is low, check the body and rotors for wear or damageCheck the check valveCAUTION: Do not raise the engine speed more than 2,500 rpm until the oil indicator light comes on