Terry I have to say that MZ was a great little bike -used it as a motorcycle courier in the summers and it just ran and ran. I took it up to the Scottish Highlands for my first long-distance camping trip. Had my first and second crash on that bike and minimal damage - never another crash since. Good memories! The CZ motocross bike was prob better 
There was a guy at the swap meet last weekend trying to sell a minty MZ for $3500 AUD (around $2200 USD) and there were no takers. My work colleague loves his but I don’t think he’s ever ridden it, has just been collecting parts for it and waiting for me to restore it.
The CZ250 was a weapon, a local amateur racer beat Gary and Trevor Flood (then current Australian Motocross champions) on it. They were racing the latest and greatest Bultaco’s (before Yamaha and Suzuki got their sh1t together) and I remember pushing Gary Flood halfway around the circuit when he went through some water and his ignition crapped out.
