1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 8Get this manual
SPECIFICATIONS Model Numbers 40802 (Big Twin, standard length) 40803 (Big Twin, 5" longer) 40852 (Big Twin Electric, standard length) 40853 Twin Electric, 5" longer) 40872 (Lark; standard length) 40873 (Lark; 5" longer) 40 hp at 4500 rpm Propeller gear ratio Propeller drive pin Propeller Alternate propellers Speed control 12.21 Part No 304575, 1 4" 1-15 32" stainless steel 10-1 2" diameter pitch, 3-blade 10-3 8" 10-3 8" 12"
11-1 2" pitch 14" pitch
Horsepower certified) Full throttle operating range Tank test with test wheel Engine type Bore and stroke Piston displacement