Per Service Manual - Spark Plug Gap is .040" - Plug is Champion L77J4
Fuel Mix is 50:1 or 12 gallons Gas to 1 quart TC-W Outboard Motor Oil
50:1
The 1975 year model, 100 hp Evinrude, requires a 50:1 fuel to oil ratio.
The listed air gap for this engine is .030 in.
50:to1
1975
Compression on a 1975 70 hp Evinrude outboard refers to the pressure generated within the engine's cylinders during the compression stroke, which is crucial for efficient combustion. Typically, compression readings for this model should be between 90 to 120 psi. Low compression can indicate issues such as worn piston rings, damaged cylinder walls, or valve problems, which can affect engine performance and reliability. Regular compression testing is essential for maintaining the health of the outboard motor.
Jew
1975 Long shaft
Is there a shear on a 1975 mercury 200 (20hp) outboard motor
50:1
40:1
50:1