We have found this problem on the M7's even when the valves were clean and everything seemed to be working properly. We have fixed the problem by shortening the cables from the recommended length down to 27 or 28 mm. Not sure why this fixes it or what long term affects this might have but it...
I have to give a vote for the 09 M8. I haven't ridden an XP yet, but the M8 is SO easy to ride even I can look good riding it! Seriously though, it makes good power is super nimble and reliability is awesome! What else do you need in a mountain sled???:d
Just wanted to say hi. I'm new to the site. I recently bought a 09 M8 153. Before that I had a 06 M7 153 and a 2004 1M800 159 and a bunch of older sleds that I won't waste my time telling you guys about. In the summer I ride a 05 Sportsman 700 EFI with 26" Mud lites.