June 1, 20233 yr Hello Have a look for JT Sprocket JTF569 or Afam 30300, this is what i use on my Ossa TR80 and i guess that the Mar use the same splines. They come on old Kawasaki KDX and old Yamaha off road, from 10 to 18 teeth and 520 chain. I don't know if there is a shouder on the mar sprocket, i use a bushing behind. Edited June 1, 20233 yr by rms
June 4, 20233 yr Author Thanks, I'll take a look. There is a very short shoulder on the original sprocket.
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