G'day Trev,
It's not very likely that it will be screwed on, as that would require a custom crankshaft.
Does the pulley look to be 2-piece? The reason I ask is that one of the Puma 1100 parts lists mentions a 'Biloc pulley'.
And these have a retainer plate held by three bolts.
If it is this type, it will have a split aluminium centre bush and cast-iron outer. A how-to download that covers fitting and removal is
HERE.
