I have bought nx5 pistons, flat and rounded.
I also have some kit pistons. Not sure why they are different?
I also don't own a nx5
I think they are considerably different in height to the nsr. The nf5 I hope are good for the F3 because I have loads and yet to check.
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mc18 F3, mc21 300, mc21ish sp, mc21/28ish.
cbr929, RC30, tdr250, rvf400, wave, gyro, joker.