2004 Johnson 90hp 2 stroke Model #- J90PLSRR I have narrowed down my engine problem to my VRO pump. The pump costs about $400. I have talked to boat shops and they have told me that I can premix my oil until I can afford to buy a new pump. I was told that they have rebuild kits for older model pumps but not for the newer models. What must be done in order to use premixed fuel and what mixture ratio (oil/fuel) should I mix it? Thanks for all help.