S&S
S&S, 114" to 128" big bore conversion cylinder & piston kit
S&S, 114" to 128" big bore conversion cylinder & piston kit
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Complete bolt-on 2092cc kit. Compatible with stock 114 engines; which have the required 4.5" stroke. Converts the 114" engine to 128". Incl. black wrinkle cylinders with highlighted fins and a forged 4.250" bore piston & ring kit with 1.0805" deck height and -7.2 cc dish volume for an 11:1 CR with stock cylinder head combustion chamber volume. Incl. all required head & base gaskets and hardware. Provides a massive increase in capacity with bolt-on installation ease; no case boring; head work or flywheel re-balancing required. Note: S&S advises 576972 S&S head bolt kit for all big bore applications.
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Why buy from Forty5°
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Verified compatibility
Every part we ship is checked against your bike's platform, year, and engine. If it doesn't fit, we tell you before you check out.
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Workshop installation
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Founder-led aftersales
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