80 years.
I believe that would be the 1986 year model.
Most likely its a 1980 I just called mercury on an engine that matched that same serial number and it was a 1980 the only difference is the last number was a 9. Im sure its a 1980.
model # is year made last two didgets
1986 model year. Last two numbers of the serial number are the year.
I would think most any reputable Merc dealer should be happy to help you out. At last check, most parts are still available through Mercury Marine for your engine. However, should you not be able to find what you need, contact me, I'll try to help.
I run my 150hp mercury V6 on 50:1 pre-mix (fuel to oil) this has been working fine for the last 7yrs! Your engine will be the same if you wish to pre-mix. This equates to 0.5 liters of oil in 25liters of fuel or 0.8pints in 5 gallons. This is very a very common practice where I live, as the Mercury engines are prone to thermostats corroding, then overheating which causes the oil pump drive to shear, loss of lubrication and then seizing!
The 3.8 liter V6 engine in a 1991 Mercury Cougar has a timing CHAIN
'93-95 ford thunderbird/mercury cougar
It has a chain that requires no maintenance and should last the life of the engine.
The duration that 5 gallons of gas will last on a 90 hp Mercury outboard motor depends on several factors, including the boat's weight, speed, and operating conditions. Generally, a 90 hp outboard consumes about 10-12 gallons per hour at full throttle. Therefore, if running at full throttle, 5 gallons would last approximately 25 to 30 minutes. At lower speeds, fuel efficiency improves, potentially extending runtime significantly.
1997