Description
If you’re running an M8 and want genuine displacement gains without cracking open the cases, the S&S Cycle 129″ Big Bore Kit delivers measurable power increases through CNC-precision engineering. This bolt-on upgrade retains your original engine serial number and stock engine height, making it the ideal choice for riders who need more cubic inches without a complete engine rebuild. You get all gaskets, hardware, and installation badges included—everything you need to bolt it on and ride.
- 129 cubic inch displacement
- S&S Cycle 910-0843 MPN
- M8 compatible only
- Bolt-on installation
- No crankcase machining
- Black with highlighted fins
- Stock engine height retained
- MLS head gaskets included
- All hardware included
- Original serial numbers preserved
- Made in the USA
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