Two-stroke outboard motors have traditionally used a mixture of gasoline and lubricating oil as their fuel. OMC introduced an oil/gasoline mixing system for their outboard motors in c. 1984, and called this feature a Variable-Ratio Oiling system or VRO.
In this regard, what does VRO mean on boat motor?
Variable Ratio oil
One may also ask, how do you test a VRO fuel pump? Start the engine, and monitor the pump cycles by using a fuel pressure gauge or by putting light finger pressure on the outlet hose.
- At 800 RPM, the oil level in the hose should drop 1″ in approx. 5 pulses.
- At full throttle, the oil level should drop 1″ in approx. 3 pulses.
Also asked, what is a VRO fuel pump?
5007420 VRO Oil Injection Conversion Fuel Pump is specially designed to exact OEM standards manufactured and tested,to help deliver optimum performance in Johnson/Evinrude engines,provides a good engine performance,which gives your machine the new power and torque it really deserves.
How do you mix oil and gas for a 2 stroke outboard?
2-Stroke Oil Mix Calculator
- For a 50:1 ratio of gas to oil, use 2.6 fluid ounces of oil per gallon of gas.
- For a 40:1 mixture, use 3.2 fluid ounces of oil per gallon of gas.
- For a 32:1 mixture, use 4 fluid ounces of oil per gallon of gas.
1 Related Question Answers Found
What year did Evinrude introduce VRO?
1984