rebuild top end?

[nhyfzrider]

i've had my yfz since october, 2 rides a week, oil changed every 3 rides, i heard that these pistons need changing every 80 hours. to do or not to do, that is the question.

[4TraxRider]

I'd rebuild mine every two years, that's what I did with the old yz426. Don't let it blow up, you'll hate it, I promise. Make sure you keep the oil fresh and clean.