frame ,motor ,wheels - no plastics ,pipe or suspension.pretyy sure its 77 or 78 250 enduro
eng# 5430004 010, head#5430006-000,barrel elko ez71/5p
The other bike is a MC5 - frame 550 04220 its got the red tank with world champoin onot and 2 petcocks. I COULDN'T READ THE ENG # - MAYBE THEY WERE SWAPPED.
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Why this may seem a little trivial since you gave us the frame numbers but the information suggest an 80's model? red tank with MC world champs would normally be a 75 again none were imported in 75 into AUS, if it has an orange frame with braced swing arm its probably 78 onwards. I'm no KTM know all so anyone chip in here? A photo of the MC would be great. slakewell at bigpond.com
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The numbers by this site are consistant with an MC5
http://www.pentonpartsusa.com/10%20B%20Technical%20KTM.htmNeither are 80's .I had a 1980 420 backin the day .they have plastic tanks and alloy arms and marzocchis forks.
The MC5 has fibreglass tanks , steel arms etc.my spare frame is orange and def 78 GS(or 77) but the mc5 is silver ---also the arms between the two are different but both are chromoly steel.
I'll try and get some pics