S&S camshaft kit, 509G gear drive (IOG)

509." valve lift. IOG = gear-driven cams with inner and outer drive gears. Complete kit with mounting bolts, bearings and gasket.
Bolt-on, high torque from idle up to 4000 RPM for 88" engines with stock compression.
The gear drive system is, in fact, a revolutionary, different and far more reliable construction. Especially in high lift/performance applications, compared to the OEM chain drive design. A gear-driven camshaft is stronger and will suffer none of the mechanical problems associated with OEM 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 stock cam gears. The only downside of gear drive is that you may experience a slight increase in mechanical noise; which is why the OEM uses a chain. It has no other mechanical advantage. Since 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 direction of the rear camshaft, providing additional operating clearance between the cams. As a result, higher cam lifts are possible with the S&S gear-driven cams.
Note: With the exception of the 475G and 510G cams, adjustable pushrods (such as MCS 503573) are required to compensate for the smaller base circle of the camshaft of these cams.
Note: It may be necessary to remove material from the inner surface of the OEM gear cover before installing the S&S outer drive gears.
Note: The required S&S installation kit (503566) for gear drive cams is included in this complete kit (IOG).
Note: Use of cams with .625", .635", .640" and .675" lift will require crankcase machining.
Note: The OEM beehive-type valve springs on 04-17 Dyna; 04-17 Softail and 04-16 Touring models accommodate valve lifts of up to .590" and a valve seat force of 160 lb, up to 6200 RPM. Exceeding 6200 RPM or 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
2.794 kg


HS Code
84831021


Motorcycle family
DYNA, SOFTAIL, TOURING


Original name
S&S, gear drive 509G camshaft kit (IOG)