When people are talking about the history of LC4 Adventure, I always wonder why it’s ancestor (89-91’) LC4 600 Incas is never mentioned. Have you ever seen it on the road? I haven't.
Specifications according to Motorrad Katalog 1990
Displacement: 553cc
Bore/stroke: 95/78 mm
Power: 45PS@7000 rpm
Torque: 53Nm@5500 rpm
Suspension travel 240/300 mm
Weight: 140 kg
Wheelbase: 1500 mm
Kick start only.

Image Source:
http://www.ktmimages.com/