It contains everything needed to make the great performance on your bike! The cylinder Head with big valve (34/29) include racing valve springs and misc parts Camshaft with roller rocker arm design include cam bearings, Increased low-end response faster Stroker Crankshaft longer +6mm from stock. Use stock gasket Ceramic Forged cylinder barrel with 68mm Forged Piston. Forged ceramic cylinder barrel is very durable for extreme condition Racing Carburetor with different jets and new intake carb and custom boot to the airbox Performance CDI Clutch Springs Throttle Cable Kit All gaskets needed for this kit include clutch cover and flywheel gaskets PLEASE NOTE: YOU WILL NEED TO BORE THE CRANKCASE MUCH LARGER. Please use a reputable machine shop only!   NOT FOR THE DIYer! THIS KIT MUST BE INSTALLED BY A PROFESSIONAL MECHANIC AS THERE ARE NO INSTRUCTIONS.