Just found my old rst piston ahh getting flashbacks looking at it , and when nearly killed my m8 we towed home to my m8`s garage and tried to start wa new plugs and as he was leaning over engine to have a look the oil cap fired off like a bullet and hit him on the chin heard a bang and he went don like a ton of bricks anyway feel free to post up some pic of ur pistons 10 points to who ever guesses what number it was