1972 Ski-Doo Shop Manual, Page 216Get this manual
3-05-01 Electrical
ELECTRIC STARTER
GENERAL All internal combustion engines require an external source of power such as an electric starter or rewind starterThe starter mechanism provides the large torque required to initiate the first compression stroke and actuate the ignition systemBASIC OPERATION The basic operation of the Bosch and MAA electric starter used on the Ski-Doo snowmobile, is as follows: The solenoid shift lever is activated when the solenoid is energized with battery
power through the ignition switchThe shift lever pushes the drive assembly (clutch) from the armature shaft to engage with the engine starter gear affixed to the engine crankshaftAs the drive assembly is pushed outward the armature shaft begins to rotate and entrains the engine starter gearOnce the engine has started, the crackshaftengine starter gear revolutions exceed the drive assemblyarmature shaft revolution and the drive assembly becomes free-runningAt this point, releasing the ignition key from the START position opens the contact surfaces within the starter solenoid and the drive assembly retracts from the engine starter gear