![JE Pistons Piston Kit - 4.125" Bore - 4.625" Stroke - 12.0:1 CR - 121" M8 [400180]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/1280x1280/products/127335/137270/parts-09107028__41648.1787048882.jpg?c=2 "JE Pistons Piston Kit - 4.125\" Bore - 4.625\" Stroke - 12.0:1 CR - 121\" M8 [400180]")
![JE Pistons Piston Kit - 4.125" Bore - 4.625" Stroke - 12.0:1 CR - 121" M8 [400180]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/127335/137270/parts-09107028__41648.1787048882.jpg?c=2 "JE Pistons Piston Kit - 4.125\" Bore - 4.625\" Stroke - 12.0:1 CR - 121\" M8 [400180]")
JE Pistons Piston Kit - 4.125" Bore - 4.625" Stroke - 12.0:1 CR - 121" M8 [400180]
Manufacturer Part Number: 400180
Parts Unlimited Part Number: 09107028
Product Type: Piston & Ring Kits
Piston Kit - 4.125" Bore - 4.625" Stroke - 12.0:1 CR - 121" M8
Details
- Compression Ratio: 12.0:1
- Displacement: 121"
- Piston Material: Forged 2618 Aluminum
- Riding Style: Street
- Bore Size: 4.125"
- Product Name: Piston Kit
- Stroke Length: 4.625"
- Units: Kit
- 2618-T6 forged construction provides better aligned grain flow and higher tensile strength to provide durability, even in high-performance builds
- Skirt coating reduces operating friction and wear
- Offset pins reduce piston rock and minimize operating noise
- Skirt notches for optimal clearance at bottom dead center
- Accumulator groove taps combustion gases below the top ring to promote more consistent, positive ring seal and performance
- Inlcudes two pistons, premium ring packs, wrist pins and wire locks
- Made in the USA
Verified Fitment
- 2023 Harley-Davidson FLHXSE CVO Street Glide
- 2025 Harley-Davidson FLHXSE CVO Street Glide
- 2023 Harley-Davidson FLTRXSE CVO Road Glide
- 2025 Harley-Davidson FLTRXSE CVO Road Glide
- 2025 Harley-Davidson FLTRXSTSE CVO Road Glide ST
Yes
![JE Pistons Piston Kit - 4.125" Bore - 4.625" Stroke - 11.5:1 CR - 121" M8 [400175]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/127331/137266/parts-09107024__11227.1787048874.jpg?c=2 "JE Pistons Piston Kit - 4.125\" Bore - 4.625\" Stroke - 11.5:1 CR - 121\" M8 [400175]")
![JE Pistons Piston Kit - 4.080" Bore - 4.625" Stroke - 12.0:1 CR - 121" M8 [400179]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/127334/137269/parts-09107027__39378.1787048880.jpg?c=2 "JE Pistons Piston Kit - 4.080\" Bore - 4.625\" Stroke - 12.0:1 CR - 121\" M8 [400179]")
![JE Pistons Piston Kit - 4.075" Bore - 4.625" Stroke - 12.0:1 CR - 121" M8 [400178]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/127333/137268/parts-09107026__68160.1787048874.jpg?c=2 "JE Pistons Piston Kit - 4.075\" Bore - 4.625\" Stroke - 12.0:1 CR - 121\" M8 [400178]")
![JE Pistons Piston Kit - 4.250" Bore - 4.625" Stroke - 12.0:1 CR - 121" M8 [400181]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/127336/137271/parts-09107029__03615.1787048882.jpg?c=2 "JE Pistons Piston Kit - 4.250\" Bore - 4.625\" Stroke - 12.0:1 CR - 121\" M8 [400181]")
![JE Pistons Piston Kit - 4.125" Bore - 4.375" Stroke - 12.0:1 CR - 107" M8 [398756]](https://cdn11.bigcommerce.com/s-2wrnp2lk/images/stencil/500x659/products/127310/137245/parts-09107001__50292.1787048830.jpg?c=2 "JE Pistons Piston Kit - 4.125\" Bore - 4.375\" Stroke - 12.0:1 CR - 107\" M8 [398756]")