MZs were neat bikes. They made a few dirt/adventure bikes with Rotax motors. The latest models used a 5-valve 660cc Yamaha single except for the parallel twin 1000 in the picture.
They had a supermoto model, an adv model, a naked model, and a faired "touring" model that used the Yamaha thumper. Under the right rider they could be pretty quick in the canyons.
The singles should be easier to get parts for, at least from a motor standpoint. The 1000, not so much.