Oil Pump Disconnecting 1999 200HP EFI OX66

Is it ok to disconnect the oil pump, and pre mix the oil 50:1 with fuel?
I dont trust these things for accuracy or longevity, and all I have is an evinrude oil resivoir, which i am sure will be compatible.
What do the Yamaha experts think?

[Dennisg]

If the motor is worth anything, and you intend to use it, not sell it, do yourself and the motor a big favor, get yourself the proper oil tank and associated parts and do it right. Do it right the first time, it will not be necessary to do it a second time.It will give you many years of trouble free boating. It is my feeling that if Yamaha wanted you to just mix the oil in the gas, they would not have gone through all the trouble of designing and building the system, they would have saved a lot of time and energy, and you would not have the clean burning, fuel efficient, non fouling, after *****ing for hours, motor that you have.
So...do it the way the designers intended.
Dennis

[boats.net]

Yamaha oil injection system works very well with little problems.

The Yamaha system has a couple of fail safe systems built into it. It will signal when the little tank on the engine goes below1/4 and reduce rpms to idle. When the (Yamaha) aux tank goes almost empty, it will signal you with a loud beep and a guage light will go off. The Yamaha tank has a pump, a filter, a level sensor all the wiring necessary to plug right into your motor. You may need the harness to get from the tank to the engine. There a a lot of them on ebay if you don't want to spring for new ones. Again, the system is redundant even if the aux tank fails to fill the engine tank. I take it your engine is replacing a JohnsonRude that used to be on the boat. Do you have Yamaha guages and controls? It is somewhat foolish to have premix if you even idle enough to wait for boat ramp traffic. The mixture is meant to be ok for wide open throttle so why would you burn all that oil at lower rpms? I mean no offense by the previous comments but the engineering has been around since the early 70's and the onlly way to have an oil related failure is to purposely run it without oil or use contaminated or really cheap oil. Just my opinion, but I believe that Yamaha was the first to have oil injected two strokes of any kind. The DT1 250 enduro motorcycle in 1969 or 1970 was the first to have this feature. You still see these bikes running around today.

The Yamaha system has a couple of fail safe systems built into it. It will signal when the little tank on the engine goes below1/4 and reduce rpms to idle. When the (Yamaha) aux tank goes almost empty, it will signal you with a loud beep and a guage light will go off. The Yamaha tank has a pump, a filter, a level sensor all the wiring necessary to plug right into your motor. You may need the harness to get from the tank to the engine. There a a lot of them on ebay if you don't want to spring for new ones. Again, the system is redundant even if the aux tank fails to fill the engine tank. I take it your engine is replacing a JohnsonRude that used to be on the boat. Do you have Yamaha guages and controls? It is somewhat foolish to have premix if you even idle enough to wait for boat ramp traffic. The mixture is meant to be ok for wide open throttle so why would you burn all that oil at lower rpms? I mean no offense by the previous comments but the engineering has been around since the early 70's and the onlly way to have an oil related failure is to purposely run it without oil or use contaminated or really cheap oil. Just my opinion, but I believe that Yamaha was the first to have oil injected two strokes of any kind. The DT1 250 enduro motorcycle in 1969 or 1970 was the first to have this feature. You still see these bikes running around today.

What about if for any reason, your engine not receive oil from pump? A clogged hose for example?