* 117in. Standard Compression – Flat Top Pistons

* Note: Crankcases must be bored to accept the larger 4-1/8in. bore cylinders

* Compression Ratios:

85cc Stock Heads = 10.9:1

89cc S&S Heads = 10.5:1

91cc S&S Heads = 10.3:1

95cc SE Heads = 10.0:1

* This big bore cylinder and piston kit contains S&S 4-1/8in. bore cylinders and forged flat topped pistons, rings, wrist pins, head and base gaskets. The cylinders are machined with the stock bolt pattern and are intended for use in stock crankcases of 2007-2017 Twin Cam engines.

* The stock 4-3/8in. stroke and 4-1/8in. bore result in a 117′ displacement.

* Cylinder finish is a durable wrinkle black powder coat. This cylinder kit may be used with stock or S&S cylinder heads with stock bolt pattern.

* For best performance, appropriate camshafts, performance air cleaner, performance exhaust and fuel system tuning are required.

Suggested Additional Purchase:

Dual spray piston cooling jet kit # SS310-1251

Tech Tips:-

* Crankcases must be bored to accept the larger 4-1/8in. bore cylinders.

* Although not mandatory, we recommend adding an oil cooler to bikes ridden in warmer climates

* The 117in. cylinder kit will reduce the engine height ~.060in., this may require the stock manifold be shortened by sanding some material off each side of the intake runner

* S&S recommends retrofitting a Timken bearing SS31-4013 into 2003-2016 model crankcases with the use of a Timken sleeve, Jim’s #JM-956. A charging system spacer for 19992002 model year is also required. S&S # SS310-0761