Took the M7 up yesterday with the new 85 duro 2.6 powerclaw, oil pump turned down 3 turns and clutch springs. Wow what a big difference. Has way more torque, feels like I geared it down. Hooks up big time and is a blast to ride. Checked the fuel oil ratio when I was done and its 37:1 and i'll check it a couple more rides. Sled was all stock when I bought it last spring with 1200 miles. I think the clutch springs were original.