Can't say I would ever be worried about that. My bike spends fuck all time above 6k rpm, only time I have ever really given it a good thrashing is at the strip and a couple of trips on some undisclosed roads in the Waikato Area.
My 250 rev'd to like 19k and I thrashed it like a thai hooker. Clearances got checked twice in my ownership and were out both times. Can't say I thrash my busa anywhere near as much, road runs out to quickly...
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