YS 624T Compression...

Installed new piston rings Dec 2008 as the comp. was down to the lower limit (according to MY manual) of 43/44... (and increased with a drop of oil in the spark plug hole)...  Haven't checked the NEW compression yet, but I do recall the upper figure was only 57...  (which is different than what someone posted) -- anyway... operation successful, as the engine now runs clean - no more blue smoke on startup.  A great machine, worth the investment... I only hope I can find the rubber tracks when these ones crack right thru & fall off...!