1978 Ski-Doo Shop Manual, Page 80Get this manual
SECTION 02 SUB-SECTION 09 (DRIVE CHAIN)
DRIVE CHAIN
GENERAL
There are three (3) types of the Bombardier drive chains; single 12" pitch, double 38" pitch, and triple 38" pitchFor proper use refer to Technical Data
CHAIN SEPARATION
When separating an endless chain, always use chain bearing pin extractorAlso, make sure to remove one complete link
12" SINGLE
112" SINGLE LINK
38" DOUBLE