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I race in TKM since 1991, I do not know much about the engines, I just let my engine builder have then about every 6-8 hours. One of my engine is about 8 years old and has been rebuilt about 14 times and the other about 4 years has been rebuilt about 7 times. Neither has any problems and both are race legal. Whether some engine builders hone the cylinder more than other I do not know, this might make a difference.
My understanding is that even when the engine has been rebuilt and has the largest piston already fitted that this engine can have a new sleeve fitted. I would assume that this is expensive and I would not want to buy an engine is this was near to be needing doing.
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