S&S Cycle Twin Cam 551 Easy Start Camshaft Kit - 106-4947

Upgrade your Harley-Davidson Touring model with the S&S Cycle 551 Easy Start Camshaft Kit. This kit is designed to deliver a significant boost in low-end and midrange torque, enhancing your riding experience from idle to 4000 rpm. Experience improved performance and responsiveness with this high-quality camshaft upgrade.

Description

The S&S Cycle 551 Easy Start Camshaft Kit is engineered for optimal performance in 88", 96", 103", and 106" Harley-Davidson Touring bikes. This kit features an innovative design that initially reduces cranking compression for easy starting. Once the engine starts and RPM increases, the compression release lobe retracts centrifugally, allowing the engine to run at full compression without any performance loss. The 551 cam is a bolt-in solution for stock or mildly modified Touring models, providing a substantial increase in torque where you need it most. This kit ensures reliable performance and ease of installation, making it an excellent choice for enthusiasts and professionals alike. The S&S Cycle 551 Easy Start Camshaft Kit is designed to work with slip-on mufflers and 9.0:1 to 9.9:1 compression ratios using a stock starter.

Features & highlights

• Easy Start design reduces cranking compression for effortless starting.
• Optimized for 88", 96", 103", and 106" Harley-Davidson Touring models.
• Delivers a significant boost in low-end and midrange torque.
• Bolt-in installation for stock or mildly modified engines.
• Improves performance from idle to 4000 rpm.
• Maintains full compression and performance after startup.
• Made in the USA.

Technical specifications

• Brand: S&S Cycle
• Grind: 551 Series
• Type: Chain
• Intake Open: 17°
• Intake Close: 19°
• Intake Duration: 215°
• Intake Lift: 0.550"
• Intake Lift at TDC: 0.178"
• Intake Lobe Centerline: 91°
• Exhaust Open: 41°
• Exhaust Close: 17°
• Exhaust Duration: 237°
• Exhaust Lift: 0.550"
• Exhaust Lift at TDC: 0.170"
• Exhaust Lobe Centerline: 102°

Important to know

This kit is not recommended for compression ratios of 10.0:1 or greater. The installer must check coil bind, valve-to-valve clearance, and valve-to-piston clearance. Not for models with OEM compression releases. Can be used with stock pushrods, lifters, and springs (unless otherwise noted).