Hi Chris first the engine cases are different 83 have a slight difference in the gear selector shaft area the offset height is different. 83 are a different frame in some areas than 84 tank and seat are different . The shock gas canister is 83 only try andfind a ohlins or wp shock the kawasaki shock is junk will not last the barrels are different between 83 and 84 reed block area reed valve aswell. I have alot of parts for these bike if you are interested i can help i and in australia and can ship no problem email me if you like
sph70@tpg.com.au hope this helps you simon