bro i have Rx135 n 115 not Z....a few friends of myn are on RxZ i my self am looking for a Z engine,, just cant find it in the condition am looking for...
Well i get my bikes made from riaz ustad in agrataj.....i have tried alot of different mechanics ,, b4 it was Ashraf ustad ,, but wasnt really satisfied in the end.... Riaz is at a very strange spot in karachi ,, but his hand on a Rx works like magic 
the guy is daym reasonable and a master at his job with Rx ,, i recently saw sucha beautiful Rx Z at his shop it was with him for like 2 months or so... made in this greenish blueish colour...i must say it was the best Rx Z seen by me so far... btw the bike was all in L key... and the parts on the bike where a treat to just look at ,, and the best part was smooth as water 
So where do you guys get your bikes tuned from?