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This sled used to rip for what it was. Would smoke my 700 mtn cat in a powder climb. It was my buddies who has passed away and I ended up with it. The sled is carbed and is running psi pipes. On the flats down in the valley it hits 7500 max rpms. Where do these motors want to run at? this seems low I was thinking 8200ish. Now when I go up in the foothills the sled runs horrible. Pulls a hill around 6000grand. Before my buddy died this sled ran amazing. I have changed nothing since I got it. I had the sled in higher elevations in a meadow and when I would give it gas it would let the clutches engage then just die. As I started to ride lower in elevation it ran better. Allt comp gone bad? Any idea where to start with this B? Would really like to get it going for a second sled for people to ride.