![KB PERFORMANCE Piston Kit - 4.250" Standard - 11.7:1 CR - 128" Big Bore - 114"/117" M8 [KB596LCASTD]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/1280x1280/products/130905/140840/parts-09106405__78561.1787116999.jpg?c=2 "KB PERFORMANCE Piston Kit - 4.250\" Standard - 11.7:1 CR - 128\" Big Bore - 114\"/117\" M8 [KB596LCASTD]")
![KB PERFORMANCE Piston Kit - 4.250" Standard - 11.7:1 CR - 128" Big Bore - 114"/117" M8 [KB596LCASTD]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/130905/140840/parts-09106405__78561.1787116999.jpg?c=2 "KB PERFORMANCE Piston Kit - 4.250\" Standard - 11.7:1 CR - 128\" Big Bore - 114\"/117\" M8 [KB596LCASTD]")
KB PERFORMANCE Piston Kit - 4.250" Standard - 11.7:1 CR - 128" Big Bore - 114"/117" M8 [KB596LCASTD]
Manufacturer Part Number: KB596LCASTD
Parts Unlimited Part Number: 09106405
Product Type: Piston & Ring Kits
Piston Kit - 4.250" Standard - 11.7:1 CR - 128" Big Bore - 114"/117" M8
Details
- Bore Size: 4.250"
- Units: Kit
- Bore - Oversize: Standard
- Style: Forged
- Compression Ratio: 11.7:1
- Piston Material: 4032 Aluminum Alloy
- Riding Style: Street
- Piston Head Shape: Domed
- Type: Big Bore
- Model: Super Duty
- Product Name: Piston Kit
- Stroke Length: 4.500"
- Displacement: 128"
- Valve pockets are designed to accept up to +4.00 mm oversized intake and exhaust valves
- Type 3 hard-anodized crown offers corrosion resistance for alcohol-added fuels
- Type 3 hard-anodized top ring groove eliminates micro-welding of ring to the groove and gives a hard-flat surface for ring to rotate on
- OE-style round wire locks are easily installed
- Heavy-duty wrist pins with true 0.9270” diameter to fit rods correctly
- Line2Line AST skirt coating starts out with a near-zero wall clearance and through the break-in period hones the cylinders to produce the correct oil wedge, keeping the piston square to the cylinder for best ring seal and quiet operation
- Kit includes pistons, rings, pins and locks
- Requires 4.250" bore cylinder sold separately.
Verified Fitment
- 2018 Harley-Davidson FLHRXS Road King Special
- 2020 Harley-Davidson FLHRXS Road King Special
- 2021 Harley-Davidson FLHRXS Road King Special
- 2023 Harley-Davidson FLHRXS Road King Special
- 2017 Harley-Davidson FLHRXS Road King Special
- 2019 Harley-Davidson FLHRXS Road King Special
- 2022 Harley-Davidson FLHRXS Road King Special
- 2024 Harley-Davidson FLHRXS Road King Special
- 2018 Harley-Davidson FLHXS Street Glide Special
- 2020 Harley-Davidson FLHXS Street Glide Special
- 2021 Harley-Davidson FLHXS Street Glide Special
- 2023 Harley-Davidson FLHXS Street Glide Special
- 2017 Harley-Davidson FLHXS Street Glide Special
- 2022 Harley-Davidson FLHXS Street Glide Special
- 2019 Harley-Davidson FLHXS Street Glide Special
- 2022 Harley-Davidson FLTRX Road Glide
- 2023 Harley-Davidson FLTRX Road Glide
- 2019 Harley-Davidson FLTRX Road Glide
- 2021 Harley-Davidson FLTRX Road Glide
- 2017 Harley-Davidson FLTRX Road Glide
- 2018 Harley-Davidson FLTRX Road Glide
- 2020 Harley-Davidson FLTRX Road Glide
- 2024 Harley-Davidson FLTRX Road Glide
- 2021 Harley-Davidson FLTRXS Road Glide Special
- 2023 Harley-Davidson FLTRXS Road Glide Special
- 2017 Harley-Davidson FLTRXS Road Glide Special
- 2018 Harley-Davidson FLTRXS Road Glide Special
- 2020 Harley-Davidson FLTRXS Road Glide Special
- 2019 Harley-Davidson FLTRXS Road Glide Special
- 2022 Harley-Davidson FLTRXS Road Glide Special
- 2018 Harley-Davidson FXBRS Breakout 114
- 2019 Harley-Davidson FXBRS Breakout 114
- 2020 Harley-Davidson FXBRS Breakout 114
- 2020 Harley-Davidson FXDRS FXDR 114
- 2019 Harley-Davidson FXDRS FXDR 114
- 2019 Harley-Davidson FLFBS Fat Boy 114
- 2022 Harley-Davidson FLFBS Fat Boy 114
- 2021 Harley-Davidson FLFBS Fat Boy 114
- 2018 Harley-Davidson FLFBS Fat Boy 114
- 2020 Harley-Davidson FLFBS Fat Boy 114
- 2023 Harley-Davidson FLFBS Fat Boy 114
- 2024 Harley-Davidson FLFBS Fat Boy 114
- 2018 Harley-Davidson FLHCS Heritage Classic 114
- 2021 Harley-Davidson FLHCS Heritage Classic 114
- 2024 Harley-Davidson FLHCS Heritage Classic 114
- 2023 Harley-Davidson FLHCS Heritage Classic 114
- 2022 Harley-Davidson FLHCS Heritage Classic 114
- 2019 Harley-Davidson FLHCS Heritage Classic 114
- 2020 Harley-Davidson FLHCS Heritage Classic 114
- 2021 Harley-Davidson FLHTKSE CVO Limited
- 2018 Harley-Davidson FLHTKSE CVO Limited
- 2020 Harley-Davidson FLHTKSE CVO Limited
- 2019 Harley-Davidson FLHTKSE CVO Limited
- 2017 Harley-Davidson FLHTKSE CVO Limited
- 2024 Harley-Davidson FLHXSE CVO Street Glide
- 2018 Harley-Davidson FLHXSE CVO Street Glide
- 2019 Harley-Davidson FLHXSE CVO Street Glide
- 2017 Harley-Davidson FLHXSE CVO Street Glide
- 2022 Harley-Davidson FLHXSE CVO Street Glide
- 2023 Harley-Davidson FLHXSE CVO Street Glide
- 2020 Harley-Davidson FLHXSE CVO Street Glide
- 2021 Harley-Davidson FLHXSE CVO Street Glide
- 2019 Harley-Davidson FLTRXSE CVO Road Glide
- 2023 Harley-Davidson FLTRXSE CVO Road Glide
- 2018 Harley-Davidson FLTRXSE CVO Road Glide
- 2021 Harley-Davidson FLTRXSE CVO Road Glide
- 2022 Harley-Davidson FLTRXSE CVO Road Glide
- 2024 Harley-Davidson FLTRXSE CVO Road Glide
- 2020 Harley-Davidson FLTRXSE CVO Road Glide
- 2018 Harley-Davidson FXFBS Fat Bob 114
- 2020 Harley-Davidson FXFBS Fat Bob 114
- 2021 Harley-Davidson FXFBS Fat Bob 114
- 2019 Harley-Davidson FXFBS Fat Bob 114
- 2022 Harley-Davidson FXFBS Fat Bob 114
- 2023 Harley-Davidson FXFBS Fat Bob 114
- 2019 Harley-Davidson FLHTCU Electra Glide Ultra Classic
- 2017 Harley-Davidson FLHTCU Electra Glide Ultra Classic
- 2018 Harley-Davidson FLHTCU Electra Glide Ultra Classic
Yes
![KB PERFORMANCE Piston Kit - 4.250" Standard - 11.4:1 CR - 124" Big Bore - 107" M8 [KB576LCASTD]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/130902/140836/parts-09106177__06779.1787116998.jpg?c=2 "KB PERFORMANCE Piston Kit - 4.250\" Standard - 11.4:1 CR - 124\" Big Bore - 107\" M8 [KB576LCASTD]")
![KB PERFORMANCE Piston Kit - 4.250" Standard - 11.8:1 CR - 124" Big Bore - 107" M8 [KB595LCASTD]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/130903/140839/parts-09106403__04251.1787116999.jpg?c=2 "KB PERFORMANCE Piston Kit - 4.250\" Standard - 11.8:1 CR - 124\" Big Bore - 107\" M8 [KB595LCASTD]")
![JE Pistons Piston Kit - 4.250" - 11.25:1 CR - 114"/117" M8 [391731]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/127293/137228/parts-09106859__92122.1787048790.jpg?c=2 "JE Pistons Piston Kit - 4.250\" - 11.25:1 CR - 114\"/117\" M8 [391731]")
![JE Pistons Piston Kit - 4.250" - 10.25:1 CR - 114"/117" M8 [394138]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/127290/137225/parts-09106856__65754.1787048788.jpg?c=2 "JE Pistons Piston Kit - 4.250\" - 10.25:1 CR - 114\"/117\" M8 [394138]")