4-5/8in. 89ci Stroker Flywheel Assembly. Fits Evolution Big Twin 1984-1999.

S&S has been making stock bore stroker kits since the early 1960s. They’re still popular today due to the excellent power gains for the money, as well as the easy installation. Stock bore strokers reuse the stock cylinders and crankcase, so the kits are economical to buy.

Features & Benefits:-

* 89ci Using this 4/5/8" flywheel & stock 3-1/2" bore cylinders

* Requires the purchase of Stroker Pistons # SS106-5555

* 1990-1999 models require purchase of pinion shaft conversion kit # SS33-4148.

* Proudly Made in the USA by S&S Cycle !

Tech Tips:-

* Compression with Stock Heads = 9.25:1

* Compression with S&S 76cc Performance Heads = 9.4:1 (SS106-6064)

* Does not fit EFI Models