Major differences were engine displacement 4x4 for a 201 WD and 4 x 4.5" for a 226 WD45, the hand clutch has 3 disks in a WD45 and 2 in a WD, the tranny gears were straight cut in all but the last WD and helical cut in the last WD and all WD45.
To tell them apart, the WD engine has a steel plate on the mag side of the engine and the WD45 ( and late WD) shift lever is curved. Serial number is the best.
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