I have a 88 Yamaha 90 and i never trust oil injection so I mix it in the tank (50:1), but I never disconnected the oil injection. So its getting double the oil i presume. Im sure its not good for the motor. Can someone tell me What harm this is doing to my motor.
Thanks
Tommy
I have a 1987/88 Yamaha 90 and had it on a 16ft bow rider. I took it off and mounted it on a 20ft pontoon. It ran great. I have always replaced the lower unit fluid and propeller every year. I start it up every week or so.
It was running great but i noticed the RPM's at WOT were 3800. The prop...
