Most snowmachines have a location for tool storage just inside your hood/cowling, or the inside of the seat "trunk." Basic tools are generally included in a container for your machine. These tools will allow minor repairs and adjustments in the field.
The tool kit of each machine should contain, at a minimum:
Flathead screw driver
Phillips head screwdriver
Pliers
Spark plug wrench
Adjustable wrench
Electrical tape
Duct Tape
Rag
Baling wire
Cord (specifically made for starting manual start snowmachines)