The best modification done so far on my RE is the installation of the duck bill breather tube, which is available (for cheap) from CMW. It replaces the line going from the engine to the air cleaner. The oil vapor leaving the engine is routed directly onto the chain, eliminating the need to lube the chain. My chain looks new and clean and shiny after using it for about 3500 miles. A properly lubed chain will extend its life and require less adjustment. A real good deal for less than 10 bucks.....Dew.