I stripped my YZF today cus a fella in the pub (as if you listen to a bloke in a pub but this one I used to work with when I was a wee slip of a greasy mechanic) told me that if you ain't sure of the history of a bike like this you should change the piston and rings to be on the safe side as the piston is so short it can spin in the bore and make a huge mess of the motor.
But once stripped I saw that , apart from looking like it's been running rich , the piston looked fresh . So I may just do the rings
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Any sign of any other go faster bits in there? Is it a standard piston or has the barrel been lightened?
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