De-carbon combustion chamber

Just wanted to let you all know about a product that Yamaha has called  "Ring Free" part  #ACC-RNGFR-EE-12  You just add a couple oz. to the fuel. It will De-carbon your valves,cumbustion chamber, and piston and rings. Its great stuff. After about 2-3 tanks of gas drain the oil, the carbon will get washed into the oil and make it black. It Improves power and efficiency in both 2 and 4 stroke engines.  I will post new pictures of my YS828 TEC after the make over..