Chung Yang ("Sikk") CY27 27.2cc 4.25+HP Marine Engine DDM Inventory Item bb208The new 2009 Chung Yang CY27 watercooled engine is a 27.2cc (34mm bore, 30mm stroke) 18,000+ RPM performance machine. It features a red silicone spark plug cap, new blue gaskets, high-flow water jacket, 4 transfer port 34mm cylinder, 30mm stuffed crankshaft, high-performance single-ring piston, Walbro WT-771 carburetor (15.88mm bore, 12.7mm venturi, adjustable high and low jets), improved cylinder plating, and more! Estimated engine power output is approx 4.25 HP. Engine mounts are included, as shown. Air filter and muffler not included. Requires 90 octane (using the R+M/2 octane rating method) or higher fuel. For R/C: Fits a wide variety of R/C boats. Chung Yang engines are commonly known as "Sikk" engines, as Sikk is a large US importer of these motors. Similar mounting dimensions as Zenoah G231PUM / G260PUM. For scooters: This engine is NOT a direct-bolt on replacement for any scooter, and requires custom fabrication to install. Recommended only for advanced and mechanically savvy users