Husqvarna 50 Workshop Manual page 23

On flywheels equipped with two crankshaft key-ways,
use the key-way marked "5" for correct ignition timing.
From serial number 9250857 the flywheel key is cast
Install the flywheel and tighten the flywheel retaining nut
to 25-30 Nm (18.4-22.1 ft.lbs.) torque. Check the air gap
between the flywheel magnets and the ignition module as
instructed in the Ignition Module section.
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NOTE !
into the flywheel.
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