John:
advantages of newer xt-engines:
-better cooling of cylinder (since '88, cylinder-code 3AJ)
-different gear-ratio (you know the problem with the 5th gear in older xts)
-different piston, slipper-type (since '96?, i'm not sure)
-better gear-box lubrication (separat oil-pipe)
-advanced ignition-system: dcdi-unit, more powerful ignition coil, but a lot of modifications in 1vj-wiring are necessary
to change the engine is simple work, to change the ignition system is a bit tricky because of the wiring.
but you can use as well the 1vj ignition if you mount the 1vj-generator (rotor/stator)
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