1978 Ski-Doo Shop Manual, Page 59Get this manual
SECTION 02 SUB-SECTION 04 (DRIVEN PULLEY) (Connect drive chain using connecting linkThe locking clip should be installed oppositely to driven pulleyPosition gear change fork in gearbox cover so that it aligns with slot of sliding gear in gear housingGear change fork
DISASSEMBLYASSEMBLY
CDlf necessary heat hub of fixed pulley and outer
cam to facilitate removal(DIn order to measure driven pulley spring tension, the pulley halves must be separatedTo do this, insert length of 18" diarod between the halvesCheck tension using fish scale positioned 900 with pulley axle(Refer to Technical Data for correct spring tension)