Keywords: 47mm piston rings.jpg A pair of en piston rings mounted on a 47mm en piston Note the use of a pin to prevent the piston rings rotating around the piston This is a feature of piston-ported engines most of which and for those 47mm diameter we can assume all of them are two-strokes Picture taken and released into the en public domain by en User Kallemax en wikipedia 2006-12-17 Kallemax wikipedia en Kallemax original upload log page en wikipedia 47mm_piston_rings jpg 2006-12-17 21 37 Kallemax 1109×480×8 155003 bytes <nowiki>A pair of piston rings mounted on a 47mm piston Picture taken and released into the public domain by User Kallemax Kallemax Photographs by User Kallemax</nowiki> Internal combustion engine pistons Two stroke engines |