Italkit 140 posted or 125 cylinder ported reliability

The new italkit cylinder has very strange porting almost looks restrictive

the Mitaka 140 has the oem porting and coupled with the head available from pjme to reduce squish to 0.9 and a decent piston and rings it is most definitely the kit I would choose

although I do own a stroked polini engine as well🤣👍

with single ring i managed up to 4000km until it seized. from the looks of it the coating on the piston will last up to 10k,km probably.
iirc italkit provide paper with their recommendation service limit.