S&S 4.375" Stroke Flywheel Assembly (320-0355)
$1,794.95
$1,465.64
(You save
$329.31
)
- This 4-3/8" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels in 2003-'06 HD internally balanced big twin engines, increasing the stroke from 4" to 4-3/8"
- Sprocket shaft does not have a stock style bearing race pressed on
- This flywheel assembly is for crankcases with Timken sprocket shaft bearing
- Pinion shaft has sprocket to drive balancer chain
- Flywheel assembly is three piece design
- Pinion and sprocket shafts are forged as part of the flywheel
- The only joints in the assembly are where the 1.671" diameter connecting rod crankpin is pressed into the flywheels
- Flywheels are CNC machined from heat-treated, closed die, steel forgings, which are 114% stronger than late style stock steel flywheels
- Fully assembled with premium quaility S&S heavy duty 7.667" connecting rods, with full width wrist pin ends, and dynamically balanced
- Assembly is trued to less than .0005" runout on pinion and sprocket shaft bearing surfaces, making them capable of higher rpm and fully compatible with gear drive cams
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 2001-2006 | Harley-Davidson | Fat Boy EFI FLSTFI | |
| 1999-2006 | Harley-Davidson | Fat Boy FLSTF | |
| 2001-2006 | Harley-Davidson | Heritage Softail Classic EFI FLSTCI | |
| 1999-2006 | Harley-Davidson | Heritage Softail Classic FLSTC | |
| 2006 | Harley-Davidson | Heritage Softail EFI FLSTI | |
| 2006 | Harley-Davidson | Heritage Softail FLST | |
| 2001-2003 | Harley-Davidson | Heritage Springer EFI FLSTSI | |
| 1999-2003 | Harley-Davidson | Heritage Springer FLSTS | |
| 2001-2006 | Harley-Davidson | Night Train EFI FXSTBI | |
| 1999-2006 | Harley-Davidson | Night Train FXSTB | |
| 1999 | Harley-Davidson | Softail Custom FXSTC | |
| 2005-2006 | Harley-Davidson | Softail Deluxe EFI FLSTNI | |
| 2005-2006 | Harley-Davidson | Softail Deluxe FLSTN | |
| 2001-2006 | Harley-Davidson | Softail Deuce EFI FXSTDI | |
| 2000-2006 | Harley-Davidson | Softail Deuce FXSTD | |
| 2005-2006 | Harley-Davidson | Softail Springer Classic EFI FLSTSCI | |
| 2005-2006 | Harley-Davidson | Softail Springer Classic FLSTSC | |
| 2001-2006 | Harley-Davidson | Softail Springer EFI FXSTSI | |
| 1999-2006 | Harley-Davidson | Softail Springer FXSTS | |
| 2001-2006 | Harley-Davidson | Softail Standard EFI FXSTI | |
| 1999-2006 | Harley-Davidson | Softail Standard FXST | |