oddball missfire situation , found. (interesting story)

[teazer]

I cut a set of R5 cylinders apart and that set had cast in liners.  Suzuki did the same thing by casting a rib around the liner to prevent it from moving. IIRC an RD or R5 liner can be bored out but you have to go much further than you would with say a Honda with press in sleeves.

http://erlenbachracing.co/rd-rz%20cylinders.htm  It's not easy to see but there's a "rib" close to the top that locates the liner if you look closely.

But to put in a new liner requires that suck a liner is available with ports already cut or at least roughed out. You could always machine the liner out far enough, port the transfers and then press in a thick wall aluminum liner and then have that bored, plated and honed.  Not sure that's within my budget though.

The Chinese cylinders are still available in MOQ of 100-200 pieces.  It's possible that VITO's bough a stack and are not buying another batch.  The market can't be too large. For some reason I have two sets.  One lightly used (v. low miles) and the other set is new and will be bored and ported and then raced.