OS .12 CZ-R question

[scottboy1973]

A quick question. There is a hole on the side of the piston of my OS CZ-R. when reasembling it, I cannot remember if the hole goes to the exaust side or the opposite side. If anyone has an exploded diagram that would be helpful. thanks in advance

 

[olds97_lss]

Sure it's not a cv-r?
http://downloads.hobbico.com/evpl/osm/ev11273aa.pdf

Is the sleeve similar at least? Looks like it lines up with that rectangular bypass port on the sleeve.

 

[scottboy1973]

This is definitly a CZ-R. It is cast in the side of the case. I got this in a Kyosho Nitro Outlaw Rampage (around 1991-1995 or so). When I was recently cleaning it in an attempt to run it again, I failed to notice the orientation of this hole. Thank you very much for the diagram of a CV-r anyway. It is very similar to my CZ-R and may have parts in common. If any one else can assist, feel free.
Thank you