Domed - Standard Bore 4.125in. 10.5:1 Compression - Recalibration required Big bore cylinder or re-sleeving required Crankcase boring required Skirt coated.Fits 2012 Harley Davidson FXS Blackline Piston Kit Wiseco 4923PS 107ci. 10.5:1 Compression - Recalibration r. Forged from high-silicon aluminum alloy for maximum strength and dependability. Innovative forging design and piston skirt provide maximum horsepower and torque. Wiseco High-Performance piston kits are priced with piston, rings, pins and circlips (unless noted otherwise). Oversize pistons require cylinder sleeving. Fitment Notes For 2012Harley DavidsonFXS Blackline. Please note some of our listings use stock photos which may be slightly different than the actual product. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle & Scooter Parts & Accessories\Engines & Engine Parts\Pistons, Rings & Piston Kits". The seller is "rad_powersports" and is located in this country: US. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech Republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South Africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi Arabia, United Arab Emirates, Qatar, Kuwait, Bahrain, Republic of Croatia, Malaysia, Brazil, Chile, Colombia, Costa Rica, Dominican Republic, Panama, Trinidad and Tobago, Guatemala, El Salvador, Honduras, Jamaica, Antigua and Barbuda, Aruba, Belize, Dominica, Grenada, Saint Kitts-Nevis, Saint Lucia, Montserrat, Turks and Caicos Islands, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Ecuador, Egypt, French Guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman Islands, Liechtenstein, Sri Lanka, Luxembourg, Monaco, Macau, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Vietnam.