i got 21,000 miles out of mine and it was trashed. while I was waiting for the replacement chain to come, the old one was so lumpy it was jerking the bike around at low speeds.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter