S&S Cycle 106-3688 97" Big Bore Forged Pistons For 1999-'06 HD® Big Twins - 3.927" Standard Bore mauritus Breather Bolt Copper Washers:H-070

Breather Bolt Copper Washers:H-070

Kit includes throttle and idle cables of throttle-by-wire extensions

Features an inverted filter top and perimeter flow design

Magnum Shielding 1742-0316

Made from a durable & ultra-soft cotton jersey performance blend

S&S Cycle 106-3688 97" Big Bore Forged Pistons For 1999-'06 HD® Big Twins - 3.927" Standard Bore mauritus Breather Bolt Copper Washers:H-070S&S Cycle 106 3688 These big bore pistons work with the stock 4" stroke flywheels to convert any 1999 '06 HD big twin engine from 88" to 97" displacement with 9. 7: 1 compression with stock heads. Stock cylinders may be bored to accommodate larger pistons, but we recommend S&S 3. 927" bore cylinders which feature high strength alloyed cast iron liners. Pistons are compatible with stock rods with tapered wristpin ends. S&S 3. 927" bore pistons are