I have rebuilt several of these. They are pretty bulletproof. The recoil is easy to assemble with a diagram. Check around on here for a manual and it's in there. If you have to buy one the 225 will work as well. The intake can be a pain because they changed them after 83. If your carb bolts to the intake they are easy to find. If it is the early one that has the rubber boot that the carb slides into then they are hard to find and can get cracks in them that allow air leaks that lead to high revs from a lean condition. Good luck.
84 200s
83 250R
84 ATC110
85 ATC110
84 YTM200
85 YTM225DX