i dont know of a seca produce in 1989,all i know that seca and maxim series came out 1981-85.maybe the 1989 seca you mean is the xj 750 S version which was produce starting 89.well anyway be it 1981 0r 1989 model the engine are the same.it only differs on the aeshtetic looks of the bike coz they add some few farings on the S version.but the category is still sports touring bike with and 87 hp.on it.About the parts no problem with theirs a lot of available parts brand new or surplus,check ebay coz diy have lots of parts. botsky