4 pieces valve stem seals valve stem seal for Piaggio X9 500

Is "blue smoke" coming from your exhaust? Do you notice a loss of power when accelerating? This is often caused by outdated, porous valve stem seals. These allow too much engine oil to enter the combustion chambers via the valves. The result is carbon deposits on the valve head, in the combustion chambers, and on the exhaust ports. In the worst case, damage to your vehicle's cylinder head can occur, so you should replace these seals with every repair that requires opening the cylinder head. The valve stem seal prevents engine oil from entering the combustion chamber via the valves or valve stems. It is placed on the valve above the lower valve head and below the spring. Only high-quality materials, such as Reinz and Elring sealing paper, were used in its manufacture. Please observe the tightening...