Honda Outboards BF40A/BF50A Service Manual, Page 249Get this manual
OUTLINE OF CHANGES BF40ABF50A CAMSHAFT
BF40A-SOA
BF35ABF45ASF40B
BF40A: No Countersunk BF50A: Countersunk INTAKE VALVE
MARKING BF40A: No Mark BF50A: Mark DASH POT CHECK VALVE
(A) BF40A BF50A CDI UNIT
A Black Gray Black Black