Just remember that if the 2 stroke isn't fresh, it could seize up..... Most people are terrified of splitting cases so allot of the air and liquid cooled 250R's need main bearings and or a crank or con rod too.
A tired 4 stroke seems to just keep chugging along aside from some smoking......
But, you have a 200X also and if you prepared to rebuild a 2 stroke (if it hasn't been freshened up) then go for it.
Most of these older trikes (esp. 2 strokes) need swinger bearings, axle bearings, brake pads and so on. Only because there usually beat on a bit more than a 200S......
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country