does anyone know exactley what the fuel/oil ratio is for a older sears 4hp...ive heard so many different opinions its hard to know hich is right...my motor is 574-59660...I want to mix in 1 gallon gas cans...heres what the book says
100:l Fuel Mixture O
Sears #603 (100:l) Outboard Motor Oil 6 Oz.
Gasoline (90 Octane) 5 Gal.
40:l Fuel Mixture O
Sears # 150 (40:l) Outboard Motor Oil 16 Oz.
Gasoline (90 Octane) 5 Gal.
20:l Fuel Mixture O O
Sears # 150 (40:l) Outboard Motor Oil 32 Oz.
Gasoline (90 Octane) 5 Gal.
@ All models from 1962, except the 3-1/2 Hp models.
O All models, including the 3-1/2 Hp engine from
1963-65.
8 All 3-1/2 Hp models through 1962.
O Not recommended for engines that use surface-gap spark plugs
100:l Fuel Mixture O
Sears #603 (100:l) Outboard Motor Oil 6 Oz.
Gasoline (90 Octane) 5 Gal.
40:l Fuel Mixture O
Sears # 150 (40:l) Outboard Motor Oil 16 Oz.
Gasoline (90 Octane) 5 Gal.
20:l Fuel Mixture O O
Sears # 150 (40:l) Outboard Motor Oil 32 Oz.
Gasoline (90 Octane) 5 Gal.
@ All models from 1962, except the 3-1/2 Hp models.
O All models, including the 3-1/2 Hp engine from
1963-65.
8 All 3-1/2 Hp models through 1962.
O Not recommended for engines that use surface-gap spark plugs
