Refer to the Disassembly/Inspection and Service page of the linked manual fro the engine. If you remove the Blower Housing (typically four bolts) and expose the fan and flywheel assembly (pg 60) you can see the flywheel is a large toothed gear. The starter is a small cylinder on what might be considered the 'passenger side' of the engine and has a small gear that matches the gearing on the flywheel. When you turn the ignition the starter is elevated so its gear meshes with the flywheel gear and makes the flywheel spin. You can actually remove the blower housing and watch this happen when you start the motor. If the flywheel doesn't spin, the starter gears aren't engaging it properly or the starter isn't working. You can have somebody else turn the ignition so you can get a relatively close look at the starter. See if it lifts into position first, and if it does is it aligned so the gears mesh, and if they do mesh, does the starter turn?
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