S&S Cycle 99-06 BT 98in Big Bore Forged Pistons - 3.937in Standard Bore
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These big bore pistons work with the stock 4" stroke flywheels to convert any 1999-'06 HD® big twin engine from 88" to 98" displacement with 10.3:1 compression with stock heads. Stock cylinders may be bored to accomodate larger pistons, but we recommend S&S 3.927" bore cylinders which feature high strength alloyed cast iron liners. Pistons are compatible with stock rods with tapered wristpin ends. S&S® 3.927" bore pistons are machined to such close tolerances that it is not necessary to measure the piston. Just bore cylinders to nominal diameter +/- 0.0005" for correct clearance. Additionally, the low friction coating on the piston skirt makes taking measurements very difficult. 3.937" standard bore.
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2006 | Harley-Davidson | FLHR Road King | Base |
| 2004-2006 | Harley-Davidson | FLHRS Road King Custom | Base |
| 1999-2006 | Harley-Davidson | FLHT Electra Glide Standard | Base |
| 2003 | Harley-Davidson | FLHTC Electra Glide Classic | Base |
| 2006 | Harley-Davidson | FLHX Street Glide | Base |
| 2006 | Harley-Davidson | FLST Heritage Softail | Base |
| 2000-2006 | Harley-Davidson | FLSTC Heritage Softail Classic | Base |
| 2000-2006 | Harley-Davidson | FLSTF Fat Boy | Base |
| 2005-2006 | Harley-Davidson | FLSTN Softail Deluxe | Base |
| 2000-2003 | Harley-Davidson | FLSTS Heritage Springer | Base |
| 1999-2002 | Harley-Davidson | FLTR Road Glide | Base |
| 1999-2005 | Harley-Davidson | FXD Dyna Super Glide | Base |
| 2005 | Harley-Davidson | FXDC Super Glide Custom | Base |
| 1999-2005 | Harley-Davidson | FXDL Dyna Low Rider | Base |
| 1999-2005 | Harley-Davidson | FXDWG Dyna Wide Glide | Base |
| 2001 | Harley-Davidson | FXDWG2 CVO Dyna Wide Glide | Base |
| 2002 | Harley-Davidson | FXDWG3 CVO Dyna Wide Glide | Base |
| 1999-2005 | Harley-Davidson | FXDX Dyna Super Glide Sport | Base |
| 2004-2005 | Harley-Davidson | FXDXI Dyna Super Glide Sport | Base |
| 2001-2003 | Harley-Davidson | FXDXT Dyna Super Glide T-Sport | Base |
| 2000-2006 | Harley-Davidson | FXST Softail Standard | Base |
| 2000-2006 | Harley-Davidson | FXSTB Night Train | Base |
| 2001-2006 | Harley-Davidson | FXSTBI Night Train | Base |
| 2000-2006 | Harley-Davidson | FXSTD Softail Deuce | Base |
| 2000-2006 | Harley-Davidson | FXSTS Springer Softail | Base |
