4-1/4in. Stroke Flywheel Assembly. Fits 80ci Big Twins from 1973-1984. - S&S Accessories for Seats & S/Bars * Requires the purchase of

* Requires the purchase of risers to gauges relocation bracket TS-TSC-2215 for Thrashin Holeshot risers or TS-TSC-2216 for Thrashin OG risers

* Fits FLSTC 1986-2017

Arlen Ness 10-Gauge Series Mirror

* T15 Torx bolts ensure extra-secure clamping for solid

4-1/4in. Stroke Flywheel Assembly. Fits 80ci Big Twins from 1973-1984. - S&S Accessories for Seats & S/Bars * Requires the purchase ofFeatures & Benefits: * Can also be used to upgrade your 1200cc Engine 1973 1980 to 1340cc 80ci Engine. Tech Tips: * Upgrading your 1200cc Engine 1973 1980 to 80ci 1340cc Engine requires the purchase of a 3 1 2 Bore Cylinder & Piston Kit # SS91 9023 & 1340cc 80ci Shovel cylinder base studs # CM 8857 8 * The 1340cc 80ci Cylinder base studs are slightly longer to compensate for the thicker cylinder base area of the 1340cc 80ci. Proudly Made in the USA by