1986 Force 85 fouled plugs

[adaptera]

I inherited a 1986 Bayliner Carpi with a Force 85 outboard motor. I've been playing with it for a month or so and this board has been a great tool helping me get comfortable with everything I need to know to use the boat. Until the last time I went out I was mixing in the oil that the previous owner had used. 50:1...1 liter to 6 gallons of gas. It was plain-old Evenrude 2 cycle marine oil. Well, I ran out and the guy at our local marine store sold me some Yamalube 2-M. I put it in the second gas tank and switched to that gas half way through the day. About a quarter tank in the boat started running REALLY bad and was topping out at about 10MPH. I limped it back to the dock, loaded up, and took it home. When I pulled the plugs they were caked in black sludge.

Did the new oil cause this or is it just a buildup from the last few weeks? What do you recommend to fix this? The plugs are pretty much brand new, can they just be cleaned?

Thanks in advance for any advice.

-brent

 

[Racer]

Re: 1986 Force 85 fouled plugs

50:1...1 liter to 6 gallons of gas.

50:1 is 1 pint to 6 gallons of gas.

If you were adding a liter you have over twice as much oil as needed. During breaking period this is generally a good thing but with an old motor its probably not.

 

[adaptera]

Re: 1986 Force 85 fouled plugs

Sorry about that...I meant pint. The mix is correct. Do you think the different type of oil can cause a problem in that motor?

-brent

 

[Frank Acampora]

Re: 1986 Force 85 fouled plugs

Is Yamalube TCW-3? If not, it is the wrong oil and will foul your plugs fast. Any brand is acceptable as long as it is rated TCW-3. Ps. Do not EVER attempt to use regular automotive oil. It contains additives which are harmful to 2 cycle engines. 1/4 tank and you will score the pistons or liners.