smaller

Hi I read somewhere that all R/R are the same. We can use any that sort of fits. But is it ok to use one from smaller engine say for example from an R6 or Ninja 6R? Or does it have to be coming from the approximately the same engine size with Vmax? Thanks. Regards,

Hello, Is valve lash going bigger or thinner with miles? Some buddies on my french board are telling that lash become smaller (valve knocking and knocking on the seat=> valve become longer and go deeper in the seat..) I am not agree, and think that lash is growinq with miles (if not, why...