Description
Kb Performance - KB409C.STD - Piston Kit - 3.875" Standard - 10.0:1 CR - 103" Twin Cam | 96" Twin Cam Big Bore
Features
- Manufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloy
- Allows a tighter fit and longer piston and ring life
- Diamond-machined pistons are held to plus or minus one gram weight and less than one-half-thousandth-inch (.0005") tolerances from piston to piston
- Each kit contains two pistons, pins, spiral-lock pin clips and Hastings moly rings
- Replacement piston rings sold separately
- KB pistons can be installed tighter than other pistons. This results in less piston rock and better ring seal. Please read instructions included with piston for correct piston clearance.
- Due to the thermal conductivity and design of KB pistons, special attention is required to the top ring end gap. Please read instructions furnished with piston for correct ring installation.
Specs
| Ring Material | Moly Coated |
| Piston Material | Hypereutectic Alloy |
| Bore Size Imperial | 3.875'' |
| Compression Ratio Imperial | 10.0:1 |
| Riding Style | Street |
| Piston Head Shape | Flat Top |
| Displacement | 103'' |
| Stroke Length Imperial | 4.375'' |
| Bore Oversize - Imperial | Standard |
| Product Name | Piston Kit |
| Units | Kit |
Fitment
| 2011-2013 | Harley-Davidson | Blackline FXS |
| 2013-2017 | Harley-Davidson | Breakout FXSB |
| 2007-2013 | Harley-Davidson | Electra Glide Classic EFI FLHTCI |
| 2007-2009 | Harley-Davidson | Electra Glide Standard EFI FLHTI |
| 2007-2016 | Harley-Davidson | Electra Glide Ultra Classic EFI FLHTCUI |
| 2015-2016 | Harley-Davidson | Electra Glide Ultra Classic Low FLHTCUL |
| 2010-2016 | Harley-Davidson | Electra Glide Ultra Limited FLHTK |
| 2015-2016 | Harley-Davidson | Electra Glide Ultra Limited Low FLHTKL |
| 2008-2017 | Harley-Davidson | Fat Bob FXDF |
| 2010-2016 | Harley-Davidson | Fat Boy Lo FLSTFB |
| 2015-2016 | Harley-Davidson | Freewheeler FLRT |
| 2007-2009, 2014-2017 | Harley-Davidson | Low Rider EFI FXDL |
| 2007-2009 | Harley-Davidson | Road Glide EFI FLTR |
| 2010-2013, 2015-2016 | Harley-Davidson | Road Glide Custom FLTRX |
| 2015-2016 | Harley-Davidson | Road Glide Special FLTRXS |
| 2011-2013, 2016 | Harley-Davidson | Road Glide Ultra FLTRU |
| 2007-2013 | Harley-Davidson | Road King Classic EFI FLHRC |
| 2007 | Harley-Davidson | Road King Custom EFI FLHRS |
| 2007-2016 | Harley-Davidson | Road King EFI FLHR |
| 2008-2011 | Harley-Davidson | Softail Cross Bones FLSTSB |
| 2007-2010 | Harley-Davidson | Softail Custom EFI FXSTC |
| 2007-2017 | Harley-Davidson | Softail Deluxe EFI FLSTNI |
| 2007 | Harley-Davidson | Softail Deuce EFI FXSTDI |
| 2007-2017 | Harley-Davidson | Softail Fat Boy EFI FLSTFI |
| 2007-2017 | Harley-Davidson | Softail Heritage Classic EFI FLSTCI |
| 2007-2009 | Harley-Davidson | Softail Night Train EFI FXSTBI |
| 2008-2011 | Harley-Davidson | Softail Rocker C FXCWC |
| 2008-2009 | Harley-Davidson | Softail Rocker FXCW |
| 2012-2017 | Harley-Davidson | Softail Slim FLS |
| 2007 | Harley-Davidson | Softail Springer Classic EFI FLSTSCI |
| 2007 | Harley-Davidson | Softail Standard EFI FXSTI |
| 2007-2017 | Harley-Davidson | Street Bob FXDB |
| 2007-2016 | Harley-Davidson | Street Glide EFI FLHX |
| 2014-2016 | Harley-Davidson | Street Glide Special FLHXS |
| 2010-2011 | Harley-Davidson | Street Glide Trike FLHXXX |
| 2007-2014 | Harley-Davidson | Super Glide Custom EFI FXDCI |
| 2007-2010 | Harley-Davidson | Super Glide EFI FXDI |
| 2012-2016 | Harley-Davidson | Switchback FLD |
| 2009-2016 | Harley-Davidson | Tri Glide Ultra Classic FLHTCUTG |
| 2007-2008, 2010-2017 | Harley-Davidson | Wide Glide EFI FXDWGI |
