The Yamaha WR500 ranges in horsepower according to the care given to the motor, the fuel mixture, and similar factors. Generally however, the WR500 tops out between 45 and 50 horsepower on a stock engine.
yamalube at 32:1
Most all models of Yamaha outboards can be operated on a 50:1 fuel to oil ratio.
According to yamaha, it's 32\1 or 40/1.
The fuel and oil mixes by itself. Why would you need to do it yourself.
one liter fuel 10 mill oil
Fuel mixture ratio for Yamaha rt100?
The 1984 model, 200 hp Yamaha requires a 50:1 ratio.
Yamaha has been oil injected since they began. If you need to mix yet, run 50/1
oil ratio is 1% Pierre
The. Mix is 20 to 1 it will run well on that. With 91 octane gasoline
32 to 1 which is one gallon of gas to 4 onces of oil