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HOME » 98 Bolt-On Big Bore Kit

Revolution Performance 98" Bolt-On Big Bore Kit

(Fits 1999-2006 88" Twin Cam style motorcycles)


The Revolution Performance 98" Twin Cam Bolt-On Big Bore Kit is the most reliable way to increase power and torque on your 1999-2006 88" Twin Cam engine. Each kit comes with our state of the art all aluminum NSC plated cylinders which last longer and run cooler than the OEM cylinders. The cylinders are matched with a premium forged piston available in two different compression ratios and a Cometic head gasket kit.

    98" Bolt-On Big Bore Kit comes with:

  • NEW 3.938" all aluminum Nickel Silicon Carbide (NSC) plated cylinders in your choice of finish: All Black, Black Highlight or Natural
  • Forged 10.5:1 compression ratio dome-top pistons (+7.5cc) or optional forged 9.5:1 compression ratio flat-top piston kit
  • Cometic head gasket kit (.030) and base o-ring
  • The 98" Bolt-On Big Bore Kit requires no other engine modifications to install but can benefit from our other products and services.

    ***NOTE: Compression ratio is dependent on the cylinder heads combustion chamber volume***

    ***NOTE: Dyno chart represents 98" Bolt-On Big Bore Kit, Velocity CNC ported heads, Feuling .543 cams, 2-into-1 exhaust and Power Vision tuned***

    ***Actual big bore kit products may vary from pictures shown above.***

For questions on our big bore kits, please contact our sales technicians directly at: 1-866-892-2109 M-F 8:30 A.M. - 5:00 P.M. CST.

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