Piston used in DAVID BROWN engines - kpl. 1cyl. Piston used in DAVID BROWN engines - kpl. 1cyl. PARAMETERS cylinder diameter: 100.04mm dimension: +0.51mm height: 105.60mm pin: 31.75mm piston rings: 4 Al-fin ENGINES DAVID BROWN AD4/55 AD4/55T DAVID BROWN AD6/55 AD6/55T MODELS DAVID BROWN 900/1000/1300/1400/1600 1400 1410 1412 90 1490 1690 1690T 94 1394 1494A