I have a 1989 force 85 engine. I want to chane the oil on upper part of engine. I see drain plug but cannot find fill plug. I see a small spot to add but i dont think that is it.
There are many models for 1989 force 85. Here is one and the part number for the drain and vent plug is 40 hope it helps. If not please post your model number.<br /> lower unit
Please confer with a qualified outboard wrench, El Aqua, or buy a repair manual.<br /><br />He will explain why you don't change the oil in the upper part of the engine.
When you go to gas it up, you're not putting *just* gas in it are you?<br /><br />Force two cycle outboards require that you mix 50 parts of gas to one part of oil. The 50:1 mixture is needed to oil your engine. There is no filling up the upper unit. The part that you are referring to is for the lower unit, which is a completely different lube.<br /><br />Anyway, if you're not mixing your gas, you're seriously wearing your motor.
This is a two stroke motor that requires a premix of oil and gasoline (TCW3 BIA or NMMA Certified Motor oil) at a 50:1 ratio, in lay terms 8 ounces per 6 galons of gasoline. There is no need to change oil in two stroke motors as there is no oil reservoir such as in four stroke motors, except for the lower unit where the gears are. <br /><br />For the lower unit you will need a specially formulated oil with lead and not sulfur for extreme pressure additive with an SAE 90 weight. You will fill it from the bottom up and not otherwise as air bubles could burst the seal.
