i have recently completed a chp z175cc fitment into my motovert rx and was pretty straight forward, i am running 17 33 gearing and can hit 115 without peaking the motor out too much,although at 115 the eyes start watering and the bike starts squirilling around, the power down low is still quite aggresive even with the gearing i run, 1/4 turn & 28mm oko still take some control taking off and when in traffic. i can however cruise at low rpm at 80k's in 4th or 60k's in 3rd at low-mid rpm. very happy with the transplant overall, i have now done 200 pretty hard k's on the motor and nothing has gone wrong yet. cross fingers.