Yamaha Ring Free is designed for use in Yamaha Outboard Motors. When Yamaha developed the HPDI (High Pressure Direct Injection) series of two stroke outboards, unlike Mercury and Evinrude, they did not go to a different oil. They also did not change the rate at which the oil was injected. Even though the motor was more efficient and burned less gasoline for a given # of revolutions, the pistons, bearings, and everything else that required lubrication were still moving the same # of times. In other words, the motor used less fuel to push the boat a given distance but it used the same amount of oil to travel that distance. This resulted in a very rich oil to fuel ratio. This caused excess carbon buildup in the cylinders. This in turn caused failure. Most of the charter boat engines in our area failed between 450 and 500 hours of use.
We had to use Ring Free or suffer engine failure. Since it was expensive, the fuel savings from the more efficient HPDI motor was partially cancelled out. Dad would sometimes run Lucas through his truck and he was adamant that it made a difference. We noticed that in a clear container we could not tell the difference. Later we found that SeaFoam is also identical regarding looks, smell, and feel.
Dad switched to Lucas based on price and partially hoping the HPDI V-Max would fail. We were never able to tell any difference.
I am not sure why you would need any of these products in an FJR, but that is your call.
