Bigbore thumpers with lots of miles/km on 'em get oval at some point, period.
Its pretty natural when you think about it.
My buddys '92 xtz660 did it at around 80.000km.
My xt600e still goes strong at that odometer reading, but i know it will happen at some point. Just a chance to get more ccm's and more compression
But it does sound early for you're bike. But noting to do about it now. Sounds crazy that it will take a month to get it bored and honed. Its not even an hours work. How much is a new cylinder and piston?
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