[THEFERMANATOR]

Originally Posted by spareparts

the yamaha oil injection does not give as much problem as the mercs and Johnrudes, that doesn't mean they are impervious to failure. AS with anything on an engie, make sure its maintained properly, and when it gets old, investigate which parts tend to fail, replace those parts if its cost effective to do so, if not, yank it off and premix. Investigate using amsoil 100 to 1 if fouling is an issue, Yamahas don't have the spark amperage that mercs adn johnrudes do, so I could understand a plug fouling issue if used with to heavy of a premix

Most of what he said. I did some research on that 100:1 AMSOIL and didn't like what I found. Make sure and check your hoses on the oil injection system, also make sure that the floats are working in the system as well as the electric pusher pump. MOST of the YAMAHA problems occur from the float switch failing and it won't pump oil up to the engine mounted reservoir or sound the low oil alarm. Also the early YAMAHAS have an update available for the oil pump as they did have some pump failures early on. My MAIN gripe with the YAMAHA system is it uses a remote reservoir and an engine mounted tank, and only an electric pump to move the oil up to the engine tank. As most any mariner knows, electrical and water don't last forever together.

If your going to keep the injection, I would check to see if you have the revised pump, linkage and lines on it, replace the float switch in the engine mounted tank, the lines that run from the boats tank to the engines tank and the electric pump that pushes the oil. This is probably overkill, but YAMAHA parts are EXPENSIVE!! One failure and it could be TOAST! I personally like SUZUKI's oil injection systems from 95+. They mixed the oil directly into the fuel, had an engine mounted oil tank, only one oil pump, and didn't use ANY electrical to work. Most ALL of the other engine manufacturers relied on some sort of electrical system or plastic drive system to work. This is one of the things that would scare me about the newer MERCURY's is the ALL electronic oil injection system.