250-500cc ring gap size please

whats its supposed to be for the wr300s? do I measure it from top or bottom of cylinder? thanks all

Not sure what it is but put the ring in cylinder about 10-15 mm down use the piston to make sure its square, measure that.

yeah did that pips, got around 0.009"-0.010"(0.22mm-0.25mm) measuring from the top. cant find actual specs

This may help

sweet mate cheers. wossner piston but sounds like im pretty close then at 0.010"! fired it up with the new piston kit, plus new lectron 38, reeds, rad hoses, kicker & she runs nice on the stand. hope its all ok

Well if thata what you calculated cant see why it shouldnt be fine.
Good luck