Evinrude 4906B 4HP 1969 Owner's Manual page 84

CYLINDER BLOCK 3-43
AIR
of a
1956 hp
E:rp~oded drawing 3.0 hp powerhead -- and the 4.0 powerhead -- 1969-70, with principle parts identified.
a of
The 4.0' hp unit uses bearing and seal on the crankshaft instead the oil slinger.