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What Is Vro On Johnson Outboard

There are many different types of outboard motors on the market today, and each has its own specific set of features and benefits. One type of outboard motor that is gaining popularity is the VRO, or Variable Ratio Oil Injection, motor. This type of motor is designed to provide optimal performance and fuel economy by automatically adjusting the oil/fuel mixture to match the conditions.

VRO, or Variable Ratio Oil Injection, is a system found on some older Johnson outboard motors. It allowed the operator to premix oil and gas at a 50:1 ratio, but also had the ability to inject oil into the fuel stream at a higher ratio, up to about 150:1. This system was designed to give the engine more lubrication at high speeds, when the oil/gas mixture is more likely to separate.

VRO systems were eventually phased out in favor of direct injection systems, which are simpler and more reliable.

Understanding and Preventing Failure of Your OMC Johnson Evinrude VRO System

What does VRO mean on Johnson outboard?

The term VRO stands for “Variable Ratio Oil Injection” and is found on some older model Johnson outboard motors. This system injected oil into the fuel mixture at a set ratio, regardless of the fuel/air mixture. The benefits of this system were two-fold.

First, it ensured that the engine always had a sufficient amount of oil in the mixture, which helped to lubricate and protect the engine. Second, it helped to improve the overall efficiency of the engine by reducing the amount of fuel that was needed to run it. However, the VRO system was eventually phased out by Johnson in favor of a more traditional oil injection system.

What does VRO do on a outboard motor?

VRO, or Variable Ratio Oil Pump, is a device fitted to some outboard motors. It allows the user to mix oil and fuel directly in the outboard motor, in the correct ratio, without the need for a separate fuel/oil mixing container. The VRO pump is fitted to the side of the outboard motor, and has a fuel hose and an oil hose attached to it.

The oil hose delivers oil to the pump from an oil tank, and the fuel hose delivers fuel to the pump from a fuel tank. The pump has a lever which the user can adjust to change the ratio of oil to fuel being delivered to the engine. The advantage of a VRO pump is that it eliminates the need to premix fuel and oil, and also eliminates the risk of getting the ratio wrong and damaging the engine.

It also means that fuel can be stored for longer periods of time without the risk of it going off. The disadvantage of a VRO pump is that it can be expensive to repair or replace if it goes wrong, and also that it can be difficult to find replacement parts for older models.

How does a Johnson VRO pump work?

The Johnson VRO pump is a type of oil pump that was specifically designed for use with outboard motors. It is a positive displacement pump that is driven by the engine, and it is used to pump oil from the oil tank to the engine. The VRO pump is a very important part of the outboard motor, and it is responsible for lubricating the engine and keeping it cool.

Without the VRO pump, the outboard motor would not be able to function properly.

How do I know if my VRO pump is working?

If you have a VRO pump, you may be wondering how you can tell if it is working properly. There are a few things that you can look for to see if your pump is functioning correctly. One way to tell if your VRO pump is working is to check the oil level in the pump.

If the oil level is low, it could be a sign that the pump is not working properly. You should also check the oil level in the engine to make sure that it is full. Another way to tell if your VRO pump is working is to listen to the sound of the pump.

If the pump is making a loud noise, it could be a sign that the pump is not working properly. If you notice any of these signs, you should take your VRO pump to a mechanic to have it checked out.

what is vro on johnson outboard


Johnson vro pump diagram

If you’re looking for a Johnson vro pump diagram, you’ve come to the right place. Here at Johnson Pump Diagrams, we have a wide selection of diagrams for all types of Johnson pumps, including the vro pump. The vro pump is a versatile pump that can be used for a variety of applications, from irrigation to water treatment.

It’s a popular choice for many because it’s easy to install and operate. When it comes to choosing a vro pump, there are a few things to keep in mind. First, you need to decide what type of vro pump you need.

There are two main types: the standard vro pump and the high-pressure vro pump. The standard vro pump is the most common type. It’s designed for applications where the water pressure isn’t too high.

The high-pressure vro pump is designed for applications where the water pressure is higher, such as in irrigation systems. Once you’ve decided on the type of vro pump you need, the next step is to find a reputable supplier. There are many companies that sell vro pumps, but not all of them are created equal.

Make sure to do your research and find a supplier that you can trust. Johnson Pump Diagrams is a great place to start your search. We offer a wide selection of diagrams for all types of Johnson pumps, including the vro pump.

Johnson 40 hp vro removal

In order to remove the Johnson 40 hp vro, it is necessary to first disconnect the power. Next, remove the cowl and the engine cover. Then, disconnect the fuel lines and the electrical connections.

Finally, remove the bolts that hold the vro in place.

Converting vro to pre-mix

If you’re a fan of two-stroke engines, you’re probably familiar with the differences between premix and oil injection. Oil injection systems automatically mix oil and gas in the proper ratio, while premix systems require you to mix the oil and gas yourself. Many people believe that premix is the superior option, as it eliminates the potential for problems that can occur with oil injection systems.

If you’re converting a two-stroke engine from oil injection to premix, there are a few things you need to do. First, you’ll need to drain the oil from the engine. Next, you’ll need to remove the oil injection pump and all associated hoses and fittings.

Finally, you’ll need to mix the gas and oil yourself, using a ratio of 50:1. Mixing the gas and oil can be a bit tricky, so it’s important to get the ratio right. Too much oil in the mixture will cause the engine to smoke, while too little oil will cause serious damage.

Once you’ve mixed the gas and oil, you can fill up the tank and enjoy the benefits of premix!


The VRO on a Johnson outboard is the oil pump. It is responsible for supplying oil to the engine. The VRO is located on the side of the engine, near the oil filter.

The VRO has two hoses that connect to it, one from the oil tank and one from the oil filter. The VRO also has a bleed screw that is used to bleed the air out of the system.

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