MMO also works really well keeping any rust gone, it is $20. bucks gallon U S funds. " MARVEL MYSTERY OIL " It also lubes the upper cylinder walls above the rings, just do not overdue it ounces to gallons, it will glaze the cylinders, especially if you have a very hot running bike. The BONUS IS it keeps the crummy fuel we get nowadays from turning to varnish and such crud, that plug up petcocks and carbys. I use 3/4 of an ounce to 2 gallons of petrol. I also always down shift on long down hills to next lower gear because it forces the rings out to the cylinder walls and breaks down any cylinder glaze build - up on the walls.