150cc RMS cylinder kit suitable for Yamaha X-Max YZF, WR and geared mopeds with YI-3 engines. All necessary mounting parts such as pistons, piston rings, gasket Kit, etc. are supplied. Please note: For vehicles with injection like Yamaha YZF-R, a tuning CDI is required for fine tuning (such as Malossi of Forcemaster 2). Vehicles with carburettor can be adjusted on the carburetor.