S&S, MR103G camshaft kit with gear drive (IOG)

Valve lift of .585". IOG = gear-driven camshafts, with inner and outer drive gears. Complete kit with installation hardware, bearings and gasket.
Designed as bolt-in camshafts for 103 CID engines with factory compression ratio of 9.7:1 up to 10.5:1. Works well with unmodified factory heads, but excels with S&S CNC-ported heads. More power across the entire RPM range, with best results between 2500-5500 RPM.
The gear drive system is in fact a revolutionary, different and far more reliable construction. Especially in high lift/performance applications, compared with the factory chain drive design. A gear driven camshaft is stronger and does not suffer the mechanical problems associated with factory chain driven camshafts. The S&S gear drive kit will increase valve timing accuracy and therefore power, by eliminating timing chain slack and the loose fit of the factory camshaft gears. The only drawback of gear drive is that you may experience a slight increase in mechanical noise; this is why the factory uses a chain. It has no other mechanical advantages. As the chain guides and tensioner are removed, there is no longer any chance of these parts failing and damaging other parts of the engine. The S&S gear drive kit reverses the rotation of the rear camshaft, providing additional operating clearance between the cams. As a result, greater camshaft lifts are possible with S&S gear driven camshafts.
Note: With the exception of the 475G and 510G camshafts, adjustable pushrods (such as MCS 503573) are required to compensate for the smaller base circle of these camshafts.
Note: It may be necessary to remove material from the inner surface of the factory gear cover before installing the S&S outer drive gears.
Note: The required S&S installation kit (503566) for gear driven camshafts is included in this complete (IOG) kit.
Note: Using camshafts with .625", .635", .640" and .675" lift will require crankcase grinding.
Note: The factory beehive valve springs on Dyna 04-17; Softail 04-17 and Touring 04-16 models support valve lifts up to .590" and a valve seat force of 160 lb, up to 6200 RPM. Running above 6200 RPM or with lifts greater than .590" will require high-performance valve springs.


Specifications


Brand
S&S


Application
99-06 Twin Cam (Excl. 2006 Dyna) with stock non-hydraulic chain tensioners (NU)


Sales unit
Kit


Material
Steel


Packaging weight
2.778 kg


HS Code
87141090


Motorcycle family
DYNA, SOFTAIL, TOURING


Original name
S&S, gear drive MR103G camshaft kit (IOG)