S&S Cycle - S&S Performance Parts 2025 L - Volume 67

1999-'06

Phone: 608-627-1497

1 -2017-UP 2 -2007-'17 3 -1999-'06 4 -1984-'99 5 -1936-'84 6 -XL-RA1250 7 -BELTS & GASKETS 8 -TOOLS 9 -WARRANTY 10 -APPENDIX

S&S 4" big bore cylinder and piston kits boost 88" Harley-David son® big twin engines to 100" These bolt-in kits don’t require any machining, rebalancing or engine removal, and include just about everything you’ll need to complete the installation The biggest cylinder bore that can be installed in a stock crankcase without machining! Fitment • 1999–2006 big twins Features & Benefits • Bolts in No machining, balancing, or splitting the crankcases • 88 engines end up at 100" • Complete kits include cylinders, pistons, gaskets, and instructions • Choose from wrinkle black or silver powder coat cylinders -matches stock finish

•When using on a carbureted model, an adjustable performance ignition must be used

•Not for use with S&S 79cc Cylinder Heads •Not for use on trike models

Specs For S&S 4" Bore Bolt-In Cylinder & Piston Kits

Compression Ratio 83cc CNC Heads

Year

Stroke

Bore

Cylinder Length

Piston Type Dome Volume

85cc Stock Heads

89cc S&S Heads

1999–2006 4"

4 00"

4 937"

Forged

8 75 pop up 10 8:1

10 5:1

10 1:1

4" Bore Bolt-In Sidewinder® Big Bore Kits Displacement Year

Stroke

Finish

Part #

1999–2006 big twin 1999–2006 big twin

4" 4"

Silver

910-0642

100"

Wrinkle Black 910-0646 NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. NOT LEGAL FOR SALE OR USE NATIONWIDE ON ANY FEDERAL POLLUTION CONTROLLED MOTOR VEHICLE UNDER THE CLEAN AIR ACT

S&S® 100 & 110 4” Big Bore Kit

These dyno results from our DynoJet® 250i chassis dynamom eter clearly show the performance increases available with the S&S bolt-in 4 inch bore kits. The lowest (red) set of curves represents a stock 88 cid engine in a 2004 Harley-Davidson® FLHR Road King®. The next curves above the stock baseline (blue) shows the performance of the S&S 100” bolt-in big bore kit. The highest set of curves show the results from an S&S 110” big bore kit installed in a 96 cid engine. The engines with the S&S 100” and 110” kits were also set up with S&S 585 cams, Power Tune® headers, Mk45 muffler, and the stock EFI throttle body with an S&S Stealth air cleaner.

140

130

120

110

100

90

80

70

60

50

Stock 88 HP 72.95 TQ 90.91

100 HP 100.30 TQ 113.07

110 HP 101.39 TQ 118.92

40

30

20 2000 2500 3000 3500 4000 4500 5000 5500 6000

RPM

3-31