1985 Ski-Doo snowmobile Service Manual, Page 242Get this manual
Section 03 TRANSMISSION Sub-section 02 (DRIVE BELT)
4Belt worn narrow in one sectionI I
Excessive slippage In drive pulley caused bya) Frozen or too tight track
AOOOOO3()12
b) Drive pulley not fonctlonlng properlyc) Engine Idle speed too highd) Incorrect belt lengthI
e) Incorrect pulley distance
a) Liberate track from ice or check track tension and alignmentb) Repair or replace drive pulley c) Reduce engine R.P.Md) Using unspecified type of beltReplace belt with carrect Bombardier belte) Readjust to specifications
5Belt sides worn concave
a) Rough or scratched pulley surfacesb) Unspecified type of telt
a) Repair or replaceb) Replace belt with correct Bombardier belt