1984 Ski-Doo Shop Manual, Page 244Get this manual
SECTION 03 TRANSMISSION
SUB-SECTION 06 (BRAKE)
RATCHET WHEEL
_ CAUTION: Similar ratchet wheels on caliper type disc brakes may have metric or standard threadsIdentify with the following illustration
Standard thread ratchet wheels
Inner ""_- caliper half
Hexagonal bolt head with or without groove
minimum
Metric thread ratchet wheel
Round head base
ASSEMBLY
4, Ratchet wheel