Honda BF40D Manuel D'utilisation page 36

27) Remove the 48 mm lock nut, timing belt guide plate, timing
pulley, 25 x 14 mm woodruff key and the guide plate from
the crankshaft.
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7-10
[1]
48 mm LOCK NUT
[2]
TIMING BELT
GUIDE PLATE
[3]
TIMING PULLEY
[4]
GUIDE PLATE
[5]
CRANKSHAFT
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[6]
25 x 14 mm
WOODRUFF KEY