150cc RMS cylinder kit suitable for Yamaha X-Max YZF and WR as well as shifting mopeds with YI-3 engine. All parts necessary for assembly such as pistons, piston rings, seal kit etc. are included. Please note: For vehicles with injection like Yamaha YZF-R a tuning CDI is required for tuning (e.g. Malossi Forcemaster 2). Cars with carburetor can be tuned via the carburetor.