Hi, I have noticed that my GPX250 has been feeling a bit strange lately. At times I feel like it is fighting against me when I want to speed up. Biggest thing I noticed today though was that the RPM has changed. When I use to maintain a speed of 80km/h my taco read 6000 rpm in top gear (5th). Today when at the 80km/h mark my taco read less (around 5500 rpm). What has happend? Can something have changed on its own? Its it some thing to worry about?