1969 Ski-Doo Snowmobiles Service Manual, Page 9Get this manual
ROTA (ENGINE) SPECIFICATIONS TYPE 300 320 370 371 368 C.C22 H.PTWO 62 MM 61 MM 9.1:1 368 C.C19 H.PTWO 62 MM 61 MM 9.15:1 318 C.C18 H.PONE 76 MM 70 MM 8.8:1 299 C.C12.5 H.PONE 76 MM 66 MM 6.5: .004 to .0061.004 to 006 1.004 to .006 640 638 C.C40 H.PTWO 76 MM 70 MM 9.1:1 .004 to .0061.004 to .006
DISPLACEMENT
NUMBER OF CYLINDERS
COMPRESSION RATIO
PISTON CLEARANCE
ELECTRICAL SYSTEM .150 to .170
SPARK PLUG (Bosch) (Gao020) FLYWHEEL MAGNETO M-240-T-l 12VSOW
I M-240-T-l
I W-2 25-T-l
I W-240-T-l
I 12V75W014 to .018 .315 to .472 .150 MAX.22 to .28oz