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Back in the days of leaded gasoline, readings in excess of 150psi were not unusual. Later models run in the 120 - 135 range, although the engine will run on around 90 - 100psi. The key thing here is that you get close to the same reading on all cylinders, no more than 10 - 15 psi difference between the lowest, and highest readings.
What else can I help you with?
What is the average compression ratio for a 2004 225 hp mercury marine motor?
depending on hours 120lbs------165lbs there should not be more than a 5lb difference between cylinders
What should the compression be for a 50 hp 4 stroke Mercury outboard motor?
125 is the least
What is an acceptable compression rating for Mercury 50 hp outboard motor?
anything over 100 on all cyl is fine and a good motor
What should the compression be at on a 150 hp mercury outboard motor?
I should be equal on all cylenders and about 110 to 120
Where can a person purchase outboard motors manufactured by Mercury Marine?
Home Depot has a variety of items to choose from to accommodate your needs. The site will allow you to observe and select a particular motor manufactured by Mercury Marine.
What year is Mercury Motor 70HP SN 08167765?
I contacted Mercury Marine outboard division and they answered within a week. Very good response.
What size battery does it take to run a Mercury 85 hp outboard motor?
Mercury wants you to install a battery with at least 525 marine cranking amps if you boat in the summer, and 1000 marine cranking amps for winter boaters.
Were do you hook a chain to remove mercury 150 outboard boat motor?
Mercury Marine uses a lifting eye that threads into the flywheel hub for mounting, and removing, the engine.
Mercury Marine where is the impeller located on a 7.5 hp motor?
The water pump impeller on a 7.5 hp Mercury outboard, is located on top of the gearcase, and is driven by the driveshaft.
Can anyone tell me how old this motor is 9.8 hp Ser No 4999954 Mercury Marine outboard?
Hello.... it appears your outboard is a 1978.
How do you find the year of mercury motor?
To find the year of a Mercury outboard motor, locate the serial number, which is typically found on the transom bracket or the engine's mounting bracket. Once you have the serial number, you can consult a Mercury Marine serial number chart available on their official website or through authorized dealers. Additionally, you can contact Mercury customer service with the serial number for assistance in determining the year of the motor.
What year is your Mercury Mariner 75hp motor with serial number 0C162640?
The Mercury Mariner 75hp motor with serial number 0C162640 is from the year 2000. Serial numbers starting with "0C" indicate that it was manufactured in that year. For more precise information, you can refer to Mercury Marine's resources or contact a dealer with the serial number.
