I have a core cylinder for a 900 Cat that would work for a big bore or repair for someone who doesn't use the power valves. The screws that hold the exhaust valve plate came loose and rattled the whole assembly until the valve hit the piston and that was the end of the trail. The bolt holes are stripped now and the slot the valve slides in is worn but I think it would work fine if the valves are not being used. $40 shipped to the lower 48.
