1、Applicable Model: Engine piston is fit for 2HP 2 Stroke Outboard engine, fit for 2SF 1989, 2SK 1985, 2MSHV 1984, 2MSHX 1999, 2MSHA 2002 Cylinder Crankcase. 2、OE Number: The part number of outboard motor piston for reference is 646 11631 01 98, please confirm whether it is consistent with the OE you need. 3、Durable: The outboard piston is made of metal material, with high strength and stable performance to ensure that the piston can work stably for a long time under high temperature and high pressure environment. 4、Excellent Sealing Performance: The sealing performance between the piston and the cylinder will directly affect the gas efficiency and exhaust noise. The piston surface contains a sealing ring to ensure efficient air tightness and lubricity and reduce fuel waste. 5、High Accuracy: The piston must have high accuracy to ensure its close fit with the cylinder block, improve gas efficiency and reduce exhaust noise.