1974 Ski-Doo Shop Manual, Page 17Get this manual
4Belt worn narrow in one section
Excessive slippage in drive pulley caused by: a) Frozen or too tight trackb)Drive pulley not functioning properlyc) Engine idle speed too highd) ncorrect belt length
Liberate track from ice or check track tension and al ignmentb) Repair or replace drive pulley
,C) Reduce engine RPMd) Using unspecified type of beltReplace belt with correct Bombardier belte) Readjust to specifications
Incorrect pulley distanceI
5Belt sides worn concaveI