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They are rare but parts really aren't a problem if you want to restore one. There is a guy in Austria with a great website for vintage KTM parts. Plastic might be hard but I believe DC makes most the stuff. KTM used this basic engine design until 1997 before they finally put the chain on the left side and moved the kickstarter to the right in '98. Hard parts shouldn't be a problem at all. I restored a '95 KTM 125 and found a nearly new Dynoport pipe for it on ebay for 35 bucks! MXM..are you going to...

I am a little late to the party on your post but if you still have this ktm 125 and need parts let me know. I have 2 spare 87 ktm 125 engines, extra cylinder, head and carb and probably some other stuff