What year did jet ski's come out making the 4 stroke enguines?

Question:
What year did jet ski's come out making the 4 stroke enguines?
How would you tell the difference between the 2 stroke and 4 stroke?
I know 2 stroke goes faster but bad on gas. I want to 4 stroke.

Answers:

Sharks, are they tired of humans and attacking?

I thought the 4 stroke came out about 5-6 years ago. 4 stroke does not pollute as much, i think.

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