Use the tapered collet supplied with the flywheel not the engine as the taper angle varies between manufacturers. Do a test fit assembling the flywheel onto the engine as some brands of engine require 2 x flywheel spacer washers to achieve clearence of the crank case (item 121 in the manual 7x11mm washer)
Once the clutch is assembled the large 5x20mm shim goes on first and should rest against the clutch nut so doesn't need to go onto the threaded part of the crank.
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