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What model year did fuel injection begin for the YZ450F?

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I know this isnt what you are looking for but a friend of mine that I raced with back when we were kids and on up into high school was telling us down at the shop last week. When he use to race down in NC. with Damon Bradshaw (they raced each other all the time) said up around late 80's or right at 1990 he was testing or riding a Yamaha that was FI.

Now thats just what he was saying and i dont see no reason why he would lie about it. I never asked but was assumeing it was a 2-stroke.

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