S&S Cycle 3.937 in Standard Bore 98 in Big Bore Forged Pistons, Model 99-06 BT, Part 920-0101

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.

S&S Cycle 3.937-inch standard-bore big bore forged pistons, part number 920-0101, are designed to work with stock 4-inch stroke flywheels to convert compatible 1999–2006 Harley-Davidson big twin engines from 88 cubic inches to 98 cubic inches of displacement. With stock heads, the pistons provide a 10.3:1 compression ratio.

Stock cylinders may be bored to accommodate these larger pistons, although S&S Cycle recommends using S&S 3.927-inch bore cylinders featuring high-strength alloyed cast iron liners. The pistons are compatible with stock rods with tapered wristpin ends. They are machined to close tolerances, so piston measurement is not required; bore cylinders to the nominal diameter within plus or minus 0.0005 inch for the correct clearance. A low-friction coating on the piston skirt can make measurements difficult.

Fitment includes the 1999–2003 Harley-Davidson FXDX Dyna Super Glide Sport, 2001 FXDWG2, 2001 FXDXT Dyna Super Glide T-Sport, 2002 FXDWG3, and 2002–2003 FXDXT Dyna Super Glide T-Sport. These pistons are not California Air Resources Board approved.

Features:

• Brand: S&S Cycle
• Model: 99-06 BT 98 in Big Bore Forged Pistons
• Part Number: 920-0101
• Bore Size: 3.937-inch standard bore
• Displacement Conversion: Converts compatible 88 cubic inch engines to 98 cubic inches with stock 4-inch stroke flywheels
• Compression Ratio: 10.3:1 with stock heads
• Cylinder Requirements: Stock cylinders may be bored to accommodate the pistons; S&S Cycle recommends 3.927-inch bore cylinders
• Rod Compatibility: Compatible with stock rods featuring tapered wristpin ends
• Fitment: 1999–2003 Harley-Davidson FXDX Dyna Super Glide Sport, 2001 FXDWG2, 2001 FXDXT Dyna Super Glide T-Sport, 2002 FXDWG3, and 2002–2003 FXDXT Dyna Super Glide T-Sport
• Regulatory Information: Not California Air Resources Board approved

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Regular Stock: false
Units Per Sku: 1
Fitment:
1999 Harley Davidson FLHR Road King Base
1999 Harley Davidson FLHT Electra Glide Standard Base
1999 Harley Davidson FLTR Road Glide Base
1999 Harley Davidson FXD Dyna Super Glide Base
1999 Harley Davidson FXDL Dyna Low Rider Base
1999 Harley Davidson FXDWG Dyna Wide Glide Base
1999 Harley Davidson FXDX Dyna Super Glide Sport Base
2000 Harley Davidson FLHR Road King Base
2000 Harley Davidson FLHT Electra Glide Standard Base
2000 Harley Davidson FLSTC Heritage Softail Classic Base
2000 Harley Davidson FLSTF Fat Boy Base
2000 Harley Davidson FLSTS Heritage Springer Base
2000 Harley Davidson FLTR Road Glide Base
2000 Harley Davidson FXD Dyna Super Glide Base
2000 Harley Davidson FXDL Dyna Low Rider Base
2000 Harley Davidson FXDWG Dyna Wide Glide Base
2000 Harley Davidson FXDX Dyna Super Glide Sport Base
2000 Harley Davidson FXST Softail Standard Base
2000 Harley Davidson FXSTB Night Train Base
2000 Harley Davidson FXSTD Softail Deuce Base
2000 Harley Davidson FXSTS Springer Softail Base
2001 Harley Davidson FLHR Road King Base
2001 Harley Davidson FLHT Electra Glide Standard Base
2001 Harley Davidson FLSTC Heritage Softail Classic Base
2001 Harley Davidson FLSTF Fat Boy Base
2001 Harley Davidson FLSTS Heritage Springer Base
2001 Harley Davidson FLTR Road Glide Base
2001 Harley Davidson FXD Dyna Super Glide Base
2001 Harley Davidson FXDL Dyna Low Rider Base
2001 Harley Davidson FXDWG Dyna Wide Glide Base
2001 Harley Davidson FXDWG2 Base
2001 Harley Davidson FXDX Dyna Super Glide Sport Base
2001 Harley Davidson FXDXT Dyna Super Glide T-Sport Base
2001 Harley Davidson FXST Softail Standard Base
2001 Harley Davidson FXSTB Night Train Base
2001 Harley Davidson FXSTBI Night Train Base
2001 Harley Davidson FXSTD Softail Deuce Base
2001 Harley Davidson FXSTS Springer Softail Base
2002 Harley Davidson FLHR Road King Base
2002 Harley Davidson FLHT Electra Glide Standard Base
2002 Harley Davidson FLSTC Heritage Softail Classic Base
2002 Harley Davidson FLSTF Fat Boy Base
2002 Harley Davidson FLSTS Heritage Springer Base
2002 Harley Davidson FLTR Road Glide Base
2002 Harley Davidson FXD Dyna Super Glide Base
2002 Harley Davidson FXDL Dyna Low Rider Base
2002 Harley Davidson FXDWG Dyna Wide Glide Base
2002 Harley Davidson FXDWG3 Base
2002 Harley Davidson FXDX Dyna Super Glide Sport Base
2002 Harley Davidson FXDXT Dyna Super Glide T-Sport Base
2002 Harley Davidson FXST Softail Standard Base
2002 Harley Davidson FXSTB Night Train Base
2002 Harley Davidson FXSTBI Night Train Base
2002 Harley Davidson FXSTD Softail Deuce Base
2002 Harley Davidson FXSTS Springer Softail Base
2003 Harley Davidson FLHR Road King Base
2003 Harley Davidson FLHT Electra Glide Standard Base
2003 Harley Davidson FLHTC Electra Glide Classic Base
2003 Harley Davidson FLSTC Heritage Softail Classic Base
2003 Harley Davidson FLSTF Fat Boy Base
2003 Harley Davidson FLSTS Heritage Springer Base
2003 Harley Davidson FXD Dyna Super Glide Base
2003 Harley Davidson FXDL Dyna Low Rider Base
2003 Harley Davidson FXDWG Dyna Wide Glide Base
2003 Harley Davidson FXDX Dyna Super Glide Sport Base
2003 Harley Davidson FXDXT Dyna Super Glide T-Sport Base
2003 Harley Davidson FXST Softail Standard Base
2003 Harley Davidson FXSTB Night Train Base
2003 Harley Davidson FXSTBI Night Train Base
2003 Harley Davidson FXSTD Softail Deuce Base
2003 Harley Davidson FXSTS Springer Softail Base
2004 Harley Davidson FLHR Road King Base
2004 Harley Davidson FLHRS Road King Custom Base
2004 Harley Davidson FLHT Electra Glide Standard Base
2004 Harley Davidson FLSTC Heritage Softail Classic Base
2004 Harley Davidson FLSTF Fat Boy Base
2004 Harley Davidson FXD Dyna Super Glide Base
2004 Harley Davidson FXDL Dyna Low Rider Base
2004 Harley Davidson FXDWG Dyna Wide Glide Base
2004 Harley Davidson FXDX Dyna Super Glide Sport Base
2004 Harley Davidson FXDXI Dyna Super Glide Sport Base
2004 Harley Davidson FXST Softail Standard Base
2004 Harley Davidson FXSTB Night Train Base
2004 Harley Davidson FXSTBI Night Train Base
2004 Harley Davidson FXSTD Softail Deuce Base
2004 Harley Davidson FXSTS Springer Softail Base
2005 Harley Davidson FLHR Road King Base
2005 Harley Davidson FLHRS Road King Custom Base
2005 Harley Davidson FLHT Electra Glide Standard Base
2005 Harley Davidson FLSTC Heritage Softail Classic Base
2005 Harley Davidson FLSTF Fat Boy Base
2005 Harley Davidson FLSTN Softail Deluxe Base
2005 Harley Davidson FXD Dyna Super Glide Base
2005 Harley Davidson FXDC Super Glide Custom Base
2005 Harley Davidson FXDL Dyna Low Rider Base
2005 Harley Davidson FXDWG Dyna Wide Glide Base
2005 Harley Davidson FXDX Dyna Super Glide Sport Base
2005 Harley Davidson FXDXI Dyna Super Glide Sport Base
2005 Harley Davidson FXST Softail Standard Base
2005 Harley Davidson FXSTB Night Train Base
2005 Harley Davidson FXSTBI Night Train Base
2005 Harley Davidson FXSTD Softail Deuce Base
2005 Harley Davidson FXSTS Springer Softail Base
2006 Harley Davidson FLHR Road King Base
2006 Harley Davidson FLHRS Road King Custom Base
2006 Harley Davidson FLHT Electra Glide Standard Base
2006 Harley Davidson FLHX Street Glide Base
2006 Harley Davidson FLST Heritage Softail Base
2006 Harley Davidson FLSTC Heritage Softail Classic Base
2006 Harley Davidson FLSTF Fat Boy Base
2006 Harley Davidson FLSTN Softail Deluxe Base
2006 Harley Davidson FXST Softail Standard Base
2006 Harley Davidson FXSTB Night Train Base
2006 Harley Davidson FXSTBI Night Train Base
2006 Harley Davidson FXSTD Softail Deuce Base
2006 Harley Davidson FXSTS Springer Softail Base