Differences between '79 and '80 250 mx

[evo550]

Looking at a project on the interweb, it is listed as a '79 250 mx, but I'm thinking it could be an '80 model.
It's missing all original plastics except for the tank which has the embedded KTM logo (not a sticker), alloy swingarm, and round black plastic ignition cover....
What do ya reckon ?

[oz555ktm]

    could be 1980/1

  Need engine Numbers or frame numbers

  any Photos 

[evo550]

I will try and get some numbers, in the meantime...

[oz555ktm]

  Ok  its a 1980 model .. and it a MX    Motor Cross Model

   Engine Number will start 9-540****     or 0-540
   you will find it on the R/H side of engine just under the Cylinder near the front engine bolt

    9 = 1979
    0 = 1980
    540 = 250 cc   or  550 = 400cc   or 510 =125cc     or  520 =175cc
    *** = just a number

   the Fram number will start 9*550 03555   or 0*550 03555   and will find it on the Head stem
   
   9 = 1979
   0 = 1980
   550 = fram production code / and year made
   03555 = fram number  thay do have other  meaning but you dont need to know

    Dennis oz555ktm

[evo550]

Thanks Oz,
Should it look like this?

or this

[oz555ktm]

   the top one is 1981     All new  frame and engine       engine 541


  yours in the 2nd photo 

  its the larst of of the old 540 engine and frame

    Dennis
    oz555ktm

[ozktm]

As dennis says above ^
Notice, in the second photo, the rear loop section of the frame matches yours.

[hoppy]

Just wondering how you I would go getting motor parts for a bike like this bearings etc.
Also is there many common problems with the 1980 model?
Have started looking for my first older bike don't have much knowledge of them.

Cheers Rob

[oz555ktm]

   Bearings , Conron  Piston Gasket all Good ...

   other parts like Gears ect E.bay ..

  the Biggest Problem is missing bits and butched bits  all and all good bikes

  If ya need hepl Just ask .....

    Wecome to the KTM family

[hoppy]

   Bearings , Conron  Piston Gasket all Good ...

   other parts like Gears ect E.bay ..

  the Biggest Problem is missing bits and butched bits  all and all good bikes

  If ya need hepl Just ask .....

    Wecome to the KTM family

Thanks will be asking lots of questions I expect.

Rob