1980 Ski-Doo Shop Manual, Page 227Get this manual
SECTION 05 SUB-SECTION 02 (DRIVE BELT)
6Belt sides worn concave
ong'nal angle
(6Belt desintegration
CAUSE a) Rough or scratched pulley
surfaces
REMEDY a) Repair or replaceb) Replace belt with correct Bombardier belt
b) Unspecified type of belt
CAUSE a) Excessive belt speed
REMEDY a) Using unspecified type of beltReplace belt with proper type of beltb) Clean pulley surfaces with fine emery cloth and lubricate with low temperature