Does anyone know the correct squish measurement to a 1975 KTM 250 mx motor? I was told .030 and no less than .025.
Thanks in advance.
from my experience any less than .040" is asking for trouble.
The trick is to set deck height to .052 hope this helps.
Some piston manufacture info has the measurement. Penton manual also has the info per displacement. Each KTM engine is different