1970-1979 Ski-Doo Snowmobiles Service Manual, Page 25Get this manual
18 HARDWARE AND COMPONENT TIGHTNESS CHECK
CHAPTER TWO
Hardware and components on all machines should be checked at least once yearAn ideal time is when the machine is placed in or removed from storageCheck the tightness of all bolts, nuts, and fastenersCheck for any damaged or worn parts, and areas that require special attention or repairRefer to Figure 19 for forward engine models and Figure 20 for mid-engine models
Normal tune-up procedures should begin with ignition adjustment, then be followed by carburetor adjustmentSince all adjustments interact, recheck items like idle adjustments after completing the entire tune-up procedureAlways check the condition of spark plug wires, ignition wires, and fuel lines for splitting, loose connections, hardness, and other signs of deteriorationCheck that all manifold nuts and carburetor nuts are tight and no crankcase leaks are presentA small air leak can make good