I got a 2003 Grizz with about 1500 miles. I run 27's tires using a Dalton clutch kit and a K&N filter. I put the clutch kit on myself so I know its right. About 3-4 months after it was put on it seems to slip a bit under heavy acceleration and the bike cuts out a bit. And it seems to not have the power it once did. And its not the 27's, they have been on it a while. Is it possible the bely may be wearing. Visually it doesn't look bad at all. For a big 660 it just doesn't have the torque it did. And I don't abuse it, so I'm kinda confused. Anyone else have a situation like this?