Re: About what year did 4 Stroke Outboards start becoming more common?
Short of a real answer I'd say the big push towards 4 strokes happened within the last 10 years. I feel like in the 90's and into the 2000's the 2 strokes with fancy oil injections that bring the mix above 100/1 were all the rage. I'm not talking about mixing pumps, I'm talking systems where oil is strategically injected. I personally have been turned into a crotchety old man who harps on new technology. I'll take a two stroke from the 80's or older and pre mix the fuel. I just can't stomach the price of newer outboards, and I know how to fix them (older ones).
For a larger craft however I am all for the economy of a four stroke. Of course when you factor in the value of the motor it would take a while for the fuel savings to balance out the cost of the motor.