LJ73 has either 2L (2446cc) or 2L-T (same but with turbo). KZJ73 had 3L turbo. 2L is a bit underpowered but tough as old boots and the natural successor to the 40 series. But it is old style engineering with no electronics. LJ73 is listed as a light duty model. Coils all round. I think so a better ride than a 40 but it will not be like a 150/200 but IMO a load more fun!
Do NOT be tempted with a BJ73 unless it has the 3B engine as the alternative, Italian made engine, is problematic.
What year is it?
Regards,
Rodger