I have a 1991 modle kdx 200, well I completely rooted the motor by blowing my crank case seels, seezing the motor then unseezing it???
But what I want to know is will a 1989 modle kdx motor fit in my 91 frame ( I can get a cheep 89 engine but will it sit in the frame ok??????
Should be the same. All they changed from 89-94 is the graphics (plus a couple of years had the upside down forks). There's a timeline on the KDX site where major updates occured: http://justkdx.dirtrider.net/
Bummer about the bike.
You'd have to buy the carb separate? Yours still in good nick? If the engine comes with the carb (I doubt it if it's from a wrecker), pick the best one. If separate, don't bother. I'm no expert, but this is the beauty of them not changing anything on the kdx - so many years' stuff fits making it easier to get parts ;)