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Message: [QUOTE="griffbones, post: 1146029, member: 72285"] I think Eric Gorr's big bore uses the Wiseco piston that is readily available. And if you keep up with your maintenance you should not have to replace or sleave the cylinder for many years. The reliablity should be just fine, after all the KX 100 uses the same crankshaft with this size bore and it is a very reliable bike. All of this is on the assumption that you are either using the KX100 top end or are having someone like Eric Gorr do the big bore for you utilizing a plated cylinder. The life span of a sleaved cylinder will be different. [/QUOTE]