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S&S Cycle 551G Gear Drive Camshaft Kit for Twin Cam and Dyna, Part Number 106-4868
Regular price $948.95 USD
Camshaft Kit - 551G Gear Drive - Twin Cam | Dyna The S&S Cycle 551G Gear Drive Camshaft Kit is designed for...
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Camshaft Kit - 551G Gear Drive - Twin Cam | Dyna
The S&S Cycle 551G Gear Drive Camshaft Kit is designed for Harley-Davidson Twin Cam and Dyna engines ranging from 96 to 106 cubic inches with compression ratios from 9:1 to 9.9:1. This bolt-in cam set is suited for stock or mildly modified touring motorcycles and delivers stronger performance throughout the rpm range, with a focus on improved low- and midrange torque from 1,000 to 4,000 rpm. The kit is not recommended for engines with compression ratios of 10:1 or greater.
The gear-drive design reverses the rear cam’s direction of rotation, creating additional operating clearance between the cam lobes and allowing higher cam lifts. It also improves valve timing accuracy by eliminating timing chain lash and the looseness associated with the stock chain. Due to the inherent characteristics of gear drives, increased valvetrain noise may occur during operation.
This complete kit includes inner gears, outer gears, inner and outer bearings, gaskets, and installation instructions. Installation requires material removal from the inner surface of the stock gear cover, along with a hydraulic press and other professional-level tools. Cam bearings and gaskets must be replaced when installing the new cams, and S&S Cycle recommends using an adjustable pushrod and cover kit. The installer must verify coil bind, valve-to-valve clearance, and valve-to-piston clearance before the engine is operated. Made in the USA.
Features:
- Designed for Twin Cam and Dyna engines from 96 to 106 cubic inches
- Compatible with compression ratios from 9:1 to 9.9:1
- 551G gear-drive camshaft set for stock or mildly modified touring motorcycles
- Reversed rear cam rotation provides additional cam lobe clearance for higher lift potential
- Improves valve timing accuracy by eliminating timing chain lash
- Delivers stronger power across the rpm range with enhanced low- and midrange torque
- Strongest performance range from 1,000 to 4,000 rpm
- Kit includes inner and outer gears, bearings, gaskets, and installation instructions
- Requires professional installation, stock gear cover modification, and clearance checks
- Made in the USA
