KB PERFORMANCE
Piston Kit - 4.250" Standard - 11.8:1 CR - 124" Big Bore - 107" M8
Part # 0910-6403
$446.95
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- Free shipping over $100
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Confirmed fit for 52 motorcycle configurations across Harley-Davidson, model years 2017–2024.
| Years | Make & Model |
|---|---|
| 2019-2022 | Harley-Davidson FLHT Electra Glide Standard |
| 2017-2024 | Harley-Davidson FLHX Street Glide |
| 2017-2022 | Harley-Davidson FLHR Road King |
| 2018-2021 | Harley-Davidson FLSL Softail Slim 107 |
| 2018-2020 | Harley-Davidson FXBB Street Bob 107 |
| 2017-2024 | Harley-Davidson FLHTCUTG Tri Glide Ultra |
| 2018-2020 | Harley-Davidson FLFB Fat Boy 107 |
| 2018-2019 | Harley-Davidson FXBR Breakout 107 |
| 2018-2020 | Harley-Davidson FXLR Low Rider 107 |
| 2018-2021 | Harley-Davidson FLHC Heritage Classic 107 |
| 2018-2024 | Harley-Davidson FLSB Sport Glide 107 |
- 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.
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Overview
The KB PERFORMANCE 0910-6403: Piston Kit - 4.250" Standard - 11.8:1 CR - 124" Big Bore - 107" M8. Confirmed fit for 52 motorcycle configurations across Harley-Davidson, model years 2017–2024. Ships from Greasemoto — a veteran-owned motorcycle parts shop in Fort Worth, TX — with free U.S. shipping on orders over $100.
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Fits these motorcycles
- Harley-Davidson FLHT Electra Glide Standard
- Harley-Davidson FLHX Street Glide
- Harley-Davidson FLHR Road King
- Harley-Davidson FLSL Softail Slim 107
- Harley-Davidson FXBB Street Bob 107
- Harley-Davidson FLHTCUTG Tri Glide Ultra
- Harley-Davidson FLFB Fat Boy 107
- Harley-Davidson FXBR Breakout 107
- Harley-Davidson FXLR Low Rider 107
- Harley-Davidson FLHC Heritage Classic 107
- Harley-Davidson FLSB Sport Glide 107