Got a '95 GTX...657.It has been changed to premix long ago.When you run this ski on da trailer its like a smoke bomb!I have 2 oyher skis that r premix and they smoke no wher near as much as this 1.I verified that it has at least the little nipples on the rotary valve blocked off.I was told to continue filling oil tank so the rvalve stays lubed.I have and do but it is using the oil.Is it possible for the oil to leak past and into the manifold???Any one ever see this problem b4? any insight would be greatly appreciated.