S&S Cycle 910-0642 100" Sidewinder Big Bore Kit for 1999-'06 HD® Big Twin Models - Silver

$1,540.95
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S&S Cycle 910-0642

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. Bolt-in kits do not require 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!

Features & Benefits

  • Low friction Ductile Cast Iron liner
  • 10.5:1 Compression
  • Bolts in. No machining, balancing, or splitting the crankcases
  • 88" engines are boosted to 100"
  • Complete kits include cylinders, pistons, gaskets, and instructions
  • Wrinkle black cylinders – matches stock finish
  • Although not mandatory, we recommend adding an oil cooler to bikes ridden in warmer climates
Stroke Bore Cylinder Length Piston Type Dome Volume 83cc CNC Heads 85cc Stock Heads 89cc S&S Heads
4 4.00" 4.937" Forged 8.75 pop up 10.8:1 10.5:1 10.1:1

*Not compatible with S&S 79cc Super Stock® heads. Not recommended for Tri-Glide or other three wheel models due to lugging nature of these bikes.

Install Instructions DownloadAdditional Install Instructions

FITMENT DISCLAIMER

Fitment information is provided as a general reference only and is not guaranteed for any motorcycle, whether stock or modified. Compatibility may vary by year, model, and individual configuration.

Customers are responsible for verifying fitment prior to purchase. House of Harley-Davidson assumes no liability for purchases made based on incorrect or unverified fitment information.

Please contact our Parts Department with any questions before ordering at 414-282-2211