For single disc models

40mm) - 7/16" mounting hole diameter - 50mm center

79-04 XL Sportster

- Stem length 18mm

80-82 FXB Sturgis

S&S, Easy Start chain drive 551 camshaft set 2006-17 Signalhorn For single disc models. 550" valve lift. CD = Chain Drive camshafts, complete kit with gasket and bearings. Torque for stock 96" Touring bikes. Strongest cam from idle to 4000 RPM for 96" to 106". Not recommended for 10: 1 or higher CR. Easy Start Cams make starting easier by reducing the build up of cranking pressure in the cylinders during starting. This is done by lifting the exhaust valve slightly of its seat, with a spring loaded compression release lobe inside the