I have a 1971 Ski-doo Nordic with a stuck piston. They both were stuck but i got one free. I sprayed WD40 down in both cylinders and it seemed to do the trick on one but not the other. All the wd40 stayed on top of the piston. I tried rocking the drive clutch back and forth with a ratchet and socket on the bolt but still no go. If you could tell me how to free this ole' stuck piston. Please let me know. Any help would be greatly appreciated.