mY 40HP 1991 eVINRUDE has difficulty starting. It idles a few sec then dies - after 20 attempts to start she finally stays idling- if i try to incr the revs during the initial idling, she dies-?flooding? this only happens when cold. Ist time starting when warm. I have been running 50:1 premix plus the vro system to check if the vro works - which it does. Right now i have a spark to the plugs but she will not fire up at all. Plug check showed a watery oil at the head, and cleaning them did not help start. I replaced the fuel with straight gas no mix as the vro is working ans still no starting. Any thoughts?