Feature:1. APPLICABLE MODEL: This is an aftermarket piston kit oversize + 0.25, perfectly suitable for outboard 2 stroke 9.9 15 HP, useful, practical, and reliable2. REPLACEMENT PART NUMBER: The OEM is 6E71163500, which is a perfect replacement for the original part and can be directly replaced for installation3. DURABLE MATERIALS: Outboard piston kit is manufactured from a durable metal alloy with erosion and rust protection to ensure overall high durability and stability4. PERFECT MATCH: The outboard motor piston kit is designed and manufactured to original specifications, meeting or exceeding the OEM to ensure form factor and function match the original device5. EXCELLENT PERFORMANCE: Designed to replace old and damaged pistons, remove old parts and replace them directly, providing more complete sealing performance and stronger mechanical energySpecification:Item Type: Outboard Piston KitReplacement Part Number: 6E7-11635-00Installation Type: Replacement of original part, direct replacementPiston Diameter: Approx. 56 + 0.25mm / 2.20 + 0.01inApplication: Used for 9.9HP 15HP outboard engine boat motorMaterial: Metal alloy.Package List:1 Set of Piston Kit (6 Pieces)Note:1. Please double check the part number of your item, matching information is for reference only.2. If you are not a professional, it is recommended to find a professional mechanic to assist in installation and ensure the best shopping experience.