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Most all of the old school mechanic's out here recommend disabling the VRO on the older OMC motors. They just have too bad of a reputation of failure and it is not worth the huge repair costs to damaged power heads when they act up.

I disconnected mine on my 1992 Johnson GT 200 immediately after I bought it because of the VRO issues, premix it a 50 to 1 and it is still running strong today. This motor has had a jet pump on it more than the prop over its 22 years and Jets are incredibly hard on the motors. When oiled and de carbonized they are like the energizer bunny...Take a licking and keep on ticking!

I believe the 1990 150 is a cross flow motor that was around for years and did a great job. It even had a little more grunt in the low end than the loopers.

What I would recommend is to run your boat on a separate portable well vented tank to see if the problem arises. Be sure and use a 3/8" fuel system and lines.... 1/4 " is too restrictive for those older 2 strokes. I had a rigger put a 1/4 fitting in my 3/8" fuel line and it took me a while to figure out what he had done....Those motors need gas....A LOT of gas but there is no better power to weight performance than what you have when it is running correctly.

Vance