Originally Posted by pilo
Looks too small for a piston clip, especially on a BRP. Engines have all sorts of clips that keep gears from moving around, but typically there is a shouldered part that hooks the clip. I'd get out the microfiche and start looking. I bet you'll find another, smaller clip than the piston clip.
I agree. looks like some keeper for a shaft to me.
Id look in the fiche too.