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I have a general question and once again I am clueless when it comes to engines. I have 90 hp 1985 Yamaha 2 stroke. I have to add 2 stroke oil to the gas which is a pain in the neck. Can i convert this engine to an oil injected engine? Do they make a kit to do this if so how much would it cost? Would it be worth doing or not doing? thanks Sean

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I recently had a 1984 Yamaha 90 HP and it had an oil tank inside the engine cowling with a fill cap on top of the cowling. Many people have begun to mix the oil in the gas instead of using the oil injection system. I think it would be pretty expensive to convert your engine even if it is possible. As long as you have the oil mixed in the gas you don't have to worry about the oil injection system crapping out and ruining the engine.

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oil injection systems are extremely reliable, much more reliable than a human mixing it properly. Most bad opinions of oil injection are made by people who "had a friend who's oil injection failed" and are not actually based in reality.

back to the subject at hand... is the oil metering pump still on your engine? If so it should not be hard to convert it back.

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I am not sure if my motor has oil metering pump as I dont think it was ever oil injected.

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As I recall OMC once made a portable tank with a system called "accumix" that had two chambers, one for the gas, and one for the oil. The tank somehow automatically sent the correct pre mix to the motor,or not...

I would stick with adding the oil myself.

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http://www.boats.net/parts/search/Yamaha/Outboard/1985/90ETLK/OIL%20PUMP/parts.html

there is the exploded diagram of the oil injection for your motor, see if you still have the parts