1972 Ski-Doo Shop Manual, Page 97Get this manual
T,ansmission DfilVE CHAIN
GENERAL The drive chain is installed in either the chain case or gear boxThe Nordic 640ER, Alpine and Valmont models incorporate gear box while chain case is installed on all other models-There are four (4l types of the Bombardier dri
ve chain, single 12 inch pitch, double 12
inch pitch, double 38 inch pitch and triple 38 inch pitch-There are also two (2l variations of chains detachable and endless-The table below lists the type of drive chain installed on all 1972 Ski-Doo snowmobiles-