My Chopper XT has what I would consider a serious vibration... because my hands are all tingly today from it. I started to notice it earlier in the year and asked my dealer to check it out back then. He did.. and said he didn't find anything out of the ordinary. I said okay but... there is definitely a difference between it and my SP model. Well.. today I needed to use doubles because the grass has really taken off. So I start it up and engage the blades and the vibration is more pronounced than ever. Next.. I start cutting the grass and the vibaration is even more severe. To top it off.. when I go up any kind of grade (even the slightest) even more vibration. I can feel vibration going up grade even with the blades disengaged. Anyone have any idea what would be causing so much vibration? I know it's not the blades.. so please don't suggest I check or try others.. I have. It seems to me that the more load there is on the machine the worse the vibration is and I don't think I'm putting any out of the ordinary load on this machine. Also.. FYI the engine never seemed to loose any significant power. Thanks in advance.