0
The compression on a 1978 20hp Mercury outboard typically ranges between 100 to 120 psi for each cylinder when the engine is in good condition. It's essential to check the compression using a compression gauge to ensure optimum performance, as low compression can indicate issues such as worn rings or valves. Regular maintenance and checks can help maintain proper compression levels.
What else can I help you with?
What year is a 20hp Mercury outboard with serial number 9137627?
The 20HP Mercury outboard with serial number 9137627 was made in 1979.
How do you replace a shear pin on a 25hp Mercury outboard?
Is there a shear on a 1975 mercury 200 (20hp) outboard motor
What is the weight of a1988 mercury 20HP outboard motor?
The dry weight for a 1988 model, 20 hp Mercury outboard is 105 lbs.
What year is mercury 200 20hp outboard serial number 2893642?
1970
What year is mercury 200 20hp outboard serial number 3070666?
1971
What year is my mercury 200 20hp outboard serial number 2661526?
1969.
What year is a 20hp Mercury outboard with serial number 9137327?
The serial number 9137327 for a 20 HP Mercury Outboard is not not listed in the Mercury Marine parts catalog.
What year is a mercury 20hp serial 4959870?
1978
What year is Mercury outboard 20HP serial number 3143107?
An 20 hp Mercury outboard, serial number 3143107, is a 1971 year model.
What is the oil to gas ratio for a mercury 20hp outboard motor?
mix 50:1
What year is mercury outboard 20HP serial number 5334211?
A 20 hp Mercury outboard, serial number 5334211, would be a 1979 year model.
Where can I find schematic of water passages in 1964 Mercury 20hp outboard motor?
try iboats.com
