I have a 04 Gixxer 600 with 2700 miles. Had the oil changed and chained tightened. When i got the bike back i noticed that had lost power/torque. Specifically when i try to clutch 2nd gear wheelies and give it throttle, the engine revs very high as if the powerband was kicking in. Therefore there is a loss in torque and the bike won't come up. Also it feels as if the powerband is kicking in too soon as i give it throttle hard to pass during normal riding. My friends listened and rode and said something was off. Can't think at all what it could be. PLEASE HELP if you have any info, thanks.