Engine & Performance for the 2025 Road King

81 verified-fit parts, each checked against the 2025 Road King specifically. Lowest price first.

• S&S CycleSpacer, Front Mount, Crankcase, Zinc Plated, 2017-up M8$7.95
• Rivera PrimoBearing, Inner Case - 2007 Later Big Twin$8.24
• S&S CycleWasher, Flywheel Thrust, 1.25 x 1.83 x .136 in, Hardened Steel$18.95
• S&S CycleWasher, Flywheel Thrust, 1.780 x 2.812 x .040 in, Bronze, 2017-up M8 Models$19.95
• Arlen NessTransmission Top Cover Titanium 12-Point Bolt Kits, BlackFrom $39.95
• Darkhorse Motor CompanyPoints Cover - Milwaukee 8$39.95
• Arlen NessDerby Cover Titanium 12-Point Bolt Kits, Black$49.95
• S&S CycleChain Drive Camshaft Installation Kit for 2017-Up M8 Models$49.95
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Derby Cover$54.95
• S&S CycleGear Drive Camshaft Installation Kit for 2017-Up M8 Models$61.95
• S&S CycleRotor Set, Oil Pump, 2017-up M8 Models$61.95
• S&S CycleBearing, Balancer Shaft, 2017-up M8 Models$63.95
• Arlen NessTitanium 12-Point Engine Case Bolt Kits, Black⚠ Has fit notes$68.95
• Alloy ArtGooden-Tite Swing Arm Reinforcement Bushings - M8 Touring$69.95
• Arlen NessTitanium 12-Point Transmission Side Cover Bolt Kit, Black$69.95
• S&S CycleRotor Set, Oil Pump, Machined, 2017-up M8 Models$71.95
• Darkhorse Motor CompanyARP Case Bolt Kit - M8 OEM CasesFrom $72.95
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Lifter Block$74.95
• Arlen NessLifter Block Titanium 12-Point Bolt Kits, Black$79.95
• S&S CycleTappet Cuffs for 2017-Up M8 Models$79.95
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Coil & Horn$84.95
• Arlen NessTitanium 12-Point Trap Door Bolt Kits, Black$89.95
• Arlen NessCam Cover Titanium 12-Point Bolt Kits, Black$99.95
• Original Garage MotoOG M8 Gen 2 Cam Cover - ClassicFrom $99.95
• Original Garage MotoOG M8 Gen 2 Cam Cover - HoneyCompFrom $99.95
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Cam Cover$104.95
• S&S CycleCam Chain Tensioner for 2017-Up M8 Models$109.95
• Daytona Twin Tec2025M8 - High Output Single Fire Ignition Coil - M8 GEN2 Touring Platform$111.99
• S&S CycleRotor Set, Oil Pump, Supply, Oil Cooled, 2017-up M8 Models⚠ Has fit notes$122.95
• Arlen NessPrimary Cover Titanium 12-Point Bolt Kits, Black$149.95
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Motor Mount$149.95
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Primary$154.95
• Alloy ArtM8 Touring Stabilizer⚠ Has fit notesFrom $159.95
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Rocker Box$174.95
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Transmission$184.95
• Arlen Ness10-Gauge Transmission Top Covers, Black$199.95
• Arlen NessRocker Box Titanium 12-Point Bolt Kits, Black$199.95
• Wood PerformanceKnight Prowler Alpha Series Lifters$200.00
• Trask PerformanceTrask Bitchin' Bolts - FL M8 Crankcase$209.95
• Arlen Ness10-Gauge Pushrod Tube Covers, All Black⚠ Has fit notes$229.95
• Arlen NessCarbon Fiber Cam Cover$229.95
• S&S CycleCrankpin, Press-In, Straight, Center Hole, Standard, 1.772 in, 2017-up M8$232.95
• Trask PerformanceM8 Intake Manifold$249.95
• FeulingInternal Rocker Box, Rockershaft Studs/Nuts, Oiling System Kit⚠ Has fit notes$279.95
• S&S CyclePrecision Tappets (M8 portion)$279.95
• Trask PerformanceTrask Assault Series Derby Cover - FL$279.95
• Wood PerformanceScreaming Eagle M8 Adjustable PushrodsFrom $300.00
• S&S CycleQuickee Adjustable Pushrods with Cover Keepers for 2017-Up M8 Models$314.95
• Wood PerformanceBW-4V Series Valve Springs⚠ Has fit notesFrom $360.00
• S&S CycleBalancer, Kit, Engine, 2017-up M8 Touring$375.95
• S&S CycleHeavy Duty Valve Spring Kit for 2017-Up M8 Models$395.95
• Alloy ArtM8 Comp Cam Cover$444.95
• Trask PerformanceTrask M8 Billet Clutch Basket$469.95
• S&S CycleOil Pump for 2017-Up M8 Oil Cooled Models⚠ Has fit notes$495.95
• S&S CycleOil Pump for 2017-Up M8 Water Cooled Touring Models⚠ Has fit notes$495.95
• Daytona Twin TecM8 Carb Racing Ignition Kit - Milwaukee Eight - 2017-2026⚠ Has fit notes · ⚠ Race/closed-course product$606.75
• Arlen Ness10-Gauge M8 Rocker Box Covers, Black$699.95
• Trask PerformanceTrask 51T FL Cush Drive Conversion Kit$699.95
• Trask PerformanceTrask 54T FL Cush Drive Conversion Kit$699.95
• Arlen NessRough Crafts M8 Rocker Box Covers, Chrome$769.95
• S&S CycleConnecting Rod Set, Heavy Duty, Full Width Wristpin, 7.953 in, 2017-up M8$815.95
• S&S CycleConnecting Rod Set, Heavy Duty, Full Width Wristpin, 8.015 in, 2017-up M8$815.95
• S&S CycleFlywheel Assembly, 4-1/2 in Stroke, Full Width Wristpin, Welded, 2017-up M8$2,049.95
• S&S CycleFlywheel Assembly, 4-3/8 in Stroke, Full Width Wristpin, Welded, 2017-up M8$2,049.95
• Darkhorse Motor CompanyMan O' War M8 Stroker Crankshaft w/ Carrillo Conn Rods$2,299.95
• S&S CycleCrankcase, Assembly, 4-1/2" Bore, Studs Not Installed, Stock Drive Bearing, Packaged, MB Code, WBlack, 2017-up M8 Touring$2,499.95
• S&S CycleCrankcase, Assembly, Stock Bore, Studs Not Installed, Stock Drive Bearing, Packaged, MA Code, Black Granite, 2017-up M8 Touring$2,499.95
• S&S CycleCrankcase, Assembly, Stock Bore, Studs Not Installed, Stock Drive Bearing, Packaged, MA Code, WBlack, 2017-up M8 Touring$2,499.95
• S&S CycleMK-Series Performance Replacement Crankcase for 2017-Up M8 Touring Models$2,499.95
• S&S CycleMK-Series Touring 4-1/2" Bore Crankcase Assembly for 2017-Up M8 Touring Models$2,574.95
• Alloy ArtThe Swinger - Touring/Bagger Swingarm$2,999.99
• S&S CyclePower Pack, Updated Profile, Oil Cooled, 128", Includes Cam Chain Tensioner, w/ Black Pushrod Tubes, 542C, WBlack w/ Highlight, 2024-up M8⚠ Has fit notes$3,294.95
• S&S CyclePower Pack, Updated Profile, Oil Cooled, 128", Includes Cam Chain Tensioner, w/ Chrome Pushrod Tubes, 542C, WBlack w/ Highlight, 2024-up M8⚠ Has fit notes$3,294.95
• S&S CyclePower Pack, Updated Profile, Oil Cooled, 132", Includes Cam Chain Tensioner, w/ Black Pushrod Tubes, 542C, WBlack w/ Highlight, 2024-up M8⚠ Has fit notes$3,294.95
• S&S CyclePower Pack, Updated Profile, Oil Cooled, 132", Includes Cam Chain Tensioner, w/ Chrome Pushrod Tubes, 542C, WBlack w/ Highlight, 2024-up M8⚠ Has fit notes$3,294.95
• S&S CyclePower Pack, Updated Profile, Water Cooled, 128", Includes Cam Chain Tensioner, w/ Black Pushrod Tubes, 542C, WBlack w/ Highlight, 2024-up M8⚠ Has fit notes$3,294.95
• S&S CyclePower Pack, Updated Profile, Water Cooled, 128", Includes Cam Chain Tensioner, w/ Chrome Pushrod Tubes, 542C, WBlack w/ Highlight, 2024-up M8⚠ Has fit notes$3,294.95
• S&S CyclePower Pack, Updated Profile, Water Cooled, 132", Includes Cam Chain Tensioner, w/ Black Pushrod Tubes, 542C, WBlack w/ Highlight, 2024-up M8⚠ Has fit notes$3,294.95
• S&S CyclePower Pack, Updated Profile, Water Cooled, 132", Includes Cam Chain Tensioner, w/ Chrome Pushrod Tubes, 542C, WBlack w/ Highlight, 2024-up M8⚠ Has fit notes$3,294.95
• Alloy ArtG2 Rear Subframe - Touring/Bagger$3,600.00
• Alloy ArtTrack/Race Edition Bagger Swingarm$3,690.00