When snowmobile season is approaching, you should perform a full check of your machine to ensure everything is in proper working order. A certified mechanic should repair any items you find that might need repair before the season starts.
A few items to check include:
Air Intake: Make sure nothing has clogged your intake
Throttle: Squeeze the throttle and make sure it moves freely
Brake: Squeeze the brake lever to ensure it works properly and does not go all the way to the handlebar grip
Other items to check:
Track
Bogie Wheels
Slide Rail/High-Fax
Wear Bars on Skis
Lights
Injection Oil Mix on 2-strokes or Oil Level on 4-strokes