Q. What does VRO mean on Johnson outboard?
Variable Ratio Oiling
Sorrry, couldn’t resist, it stands for Variable Ratio Oiling. Basically it works like most two stroke oiling systems by varying the amount of oil needed to mix with the gas for your motor.
Q. How do you test a VRO 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.
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