Here is a great find and an essential item if you are restoring , or riding your Yamaha XS1100 or sometimes called the XS11. This full set of 4 piston rings sets (so enough for 1 complete engine) for the 1978 1979 1980 1981 XS1100 Yamaha motorcycles. This is a very helpful and essential and item if you are restoring or riding your motorcycle.   These are Standard (STD.) 71.5mm size. Correct replacement for part #3J2-11610-00-00. These are for the stock standard size Yamaha pistons.  Perfect fitment. No disappointments here, we only sell the best! Top quality aftermarket item.  Get your bike up and running nicely again. These sure are fast, fun bikes eh?