The 200 (chain drive) did come with a automatic decompression from the factory, all the other 200's and 225's came with a manual decompression lever. The pull starter housing is different and the release lever is different.
Most of the time the decompression has been removed, they wear out faster then the rest of the trike.
What part are you wanting to replace?
1984 Yamaha YT 60 Tri Zinger(current project)
1983 Yamaha YTM 200 (rear suspension kit)..... long term project
2004 BMW R1150R
1972 Honda CT 70
2007 Lifan 110