My 2 cycle 90 hp Yamaha has oil injection so I do not have to mix
oil. Apparently, when the throttle linkage on the carb opens it
causes more oil to be injected. There is a small plastic ball and
socket joint for this linkage that can easily break. When this
happens, it goes to full oil injection.
For things at my work, I have tried to use these plastic ball and
socket joints and find them to be too weak for anything other than
toys. I would not use them on anything I designed.
Perhaps, somebody needs to make metal replacements...........