From what I've read in the past here and even asked questions about...all the XR 200 motors are six speeds and will bolt right into a 200x frame because they are pretty much exactly the same. The problem comes from the kickstarter kicking rearward as opposed to the 200x's forward kicker. You could just take your fenders off to start it every time or you could swap the entire kickstarter assembly from the X into the bottom end of the XR and use the right side case cover from the X on the XR motor. You would actually need to do that anyway because the rear brake is connected to the right side case cover on the X. Easiest thing to do would be to use any parts you need out of the XR motor and put them in the X motor like the 6 speed tranny for instance. Do a search, there is tons of stuff on here about this.
Trikes
1984 Honda 200x, 1984 Honda 200m
Bikes
1995 Honda CR125R, 1985 Honda XL100 (gone), 1982 Kawisaki KZ550 LTD,
2001 Yamaha TT-R 125L, 1983 Honda XL185S (current project), 2001 Suzuki SV650S