Ok, yes, another "What is this? Post.

[zzr1200]

Flywheel puller for a JLO 372cc engine fitted to a Mighty Midget Welder...

 

[andymfell]

flywheel puller for a Stihl disc cutter fitted with a bosch manufactured ignition system

 

[pedrobedro]

Many Jap motorcycle ones are just like the one in the photo.

Lambrettas use one like that as well.

 

[graffian]

Not for push bikes and cotter less cranks. Different threads I think

I think they are 22x1mm.

 

[The_Yellow_Ardvark]

A lot of you were very close.

It is a flywheel remover for a Lambretta Scooter.
I was asked to free it off as it had seized tight.
A bit of heat, bit of vinegar and we were away.

 

[pedrobedro]

Lambrettas use one like that as well.

Was this close enough ? The one I have has threads on each end and fits a couple of different scooters.