This is an '08 Husaberg and the rear sprocket and chain are pretty new. I put a new front sprocket on (15t), but it wouldn't fit with the chain slider, so I modified the slider. There's not much room around the 15t, so I was a little paranoid. I've never tried this with my 'berg, but I ran it in first gear on the stand, just to make sure everything looked ok. But, the chain is jumping quite a bit. So, I put the old sprocket back on (14t- still in excellent condition, shows no wear). I get the same jumping. When I give it a little throttle, it seems to jump a bit less, but still jumps a lot. Here's a video: https://picasaweb.google.com/117975012494739338237/Junk#5832002953261146322 Not sure if that video will work, because my work blocks it for me. I posted this on Husaberg.org, and one guy said it's normal when the suspension is uncompressed. Tonight, I'll look for a kink in the chain, but I'd be very surprised to find one. Any ideas?