1970-1979 Ski-Doo Snowmobiles Service Manual, Page 52Get this manual
TROUBLESHOOTING Glazed Belt glazed or baked appearance on the edge of the belt as shown in Figure 11 is usually the result of some mechanical difficultyPulley shafts may be rusted or the drive pulley may have worn or missing flyweightsrollersRefer this type of belt wear to adealerHe has the expertise to pinpoint the malfunctionWorn Top Width Excessive wear in the top width of the belt (Figure 12) can be caused by erratic drive pulley
actuation or rough or scratched pulley surfacesIf all mechanical systems are functioning properly, the belt may just be worn outReplace drive belt if its width is Ys in(3mm) less than newRefer to Chapter SevenBelt Worn In One Section Spot wear such as shown in Figure 13 is often caused by frozen or too tight trackCheck also for too high idle speed, incorrect belt length, incorrect pulley distance, or malfunction in the drive pulleyBelt Edges Worn Concave