BAKER Function Formed Primary
(For 1990-2006 Softail Models)
The primary drive housing is the most recognizable piece of architecture on American motorcycles. It is centrally located and transfers power from the engine to the transmission. We sculpted our forged 6061-T6 Function Formed Primary (FFP) to enhance the natural mechanical beauty of the elements inside. A SolidWorks 3D model of the clutch, chain, starter pinion, and motor sprocket was created and then we sparingly started adding material to wrap around those elements. No extra aluminum, just mechanical beauty. And there's a glory hole in the middle for that open look, with the benefits of the chain intact. FFP fits all Softail models, Evo and Twin Cam without modification. Compatible with stock 66-tooth and 102-tooth clutches, compensating sprocket, chain, and starter motors. Each primary kit includes an inner primary housing, outer primary cover, 1-piece starter jackshaft, chain adjustment shoe and mechanism, gaskets, and fasteners. For performance junkies with mountain motors, the FFP has an optional internal outside bearing support (FFPS). Applications above 150 ft-lbs require the outside clutch support to keep the transmission mainshaft from flexing. The outside bearing support version is the first enclosed, wet primary available to have this feature and is specifically designed to work in conjunction with the BAKER King Kong Klutch upgrade. |
| Click to Enlarge | The King Kong Klutch is the ultimate high performance clutch for Big Twin Motorcycles. Torque capacity was dramatically increased by using 20, 7" diameter single sided K2 friction plates. The Bearing Support version of the FFP is designed to work specifically with the BAKER KKK 'King Kong Klutch'. The derby cover of the primary has a bearing race pressed onto the snout of the cover which slides inside the bearing of the clutch support. When installed, it is designed to keep the clutch assembly true to the world no matter how much horse power you can throw at it. |
The FFP is the only primary in the aftermarket that features an externally adjustable primary chain. No removal of the outer primary is necessary and no gaskets are used. Just remove the inspection cover and adjust the chain to specification with the adjuster screw on the bottom of the primary (as shown). |
The Function Form Primary comes standard with our High Torque Bearing kit, pn 189-56, installed. This removes the stock (pn 34091-85) inner bearing race that has been used on Big Twins since 1985. This factory inner primary bearing rides on this race. By design, this race press-fits onto the transmission mainshaft. This system works fine for stock engines. 100 HP+ engines will make this race walk on the mainshaft. If it walks inboard, it will damage the maindrive gear seal and cause a transmission oil leak. If it walks outboard, it will cause a primary oil leak. Our high torque bearing kit eliminates this condition and that is why it is standard. |
Available in the Following Finishes
| Polished |
| Black Anodized |
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