I just got a 02 ktm 125 sx with a 134 cc and was trying to find info about powervalve, and everything I read never said how sensitive it is to adjustments compared to the jap bikes..when I got it the pv was closed all the way and after after trying a slight adjustment of opening it a bit,HOLY CRAP!! !this this thing rips...fastest 125 I think I ever owned..and over 35 years I had a lot of bikes...just thought I would throw it out there...