| Specification | Data |
|---|---|
| Production Years | 2005–2007 |
| Engine Type | Twin Cam 88B (2005-06) / Twin Cam 96B (2007) |
| Oil Capacity | 2.9 L (3.1 qt) |
| Oil Grade | SAE 20W50 |
| Front Tire | 130/90B16 (MT90B16) |
| Rear Tire | 150/80B16 |
| Spark Plug | 6R12 |
| Battery | 65989-97C |
A unique hallmark of the Harley-Davidson Softail Springer Classic (FLSTSC) is its meticulous engineering homage to the 1948 Panhead. Unlike modern hydraulic forks, the FLSTSC utilized a trailing-link Springer front end that featured a unique exposed chrome shock absorber—the only Softail variant of its era to combine the vintage mechanical spring look with a modern internal dampening unit for improved road compliance.
Engineering Overview
The FLSTSC represents the pinnacle of Harley-Davidson’s “retro-modern” era. Built on the Softail chassis, which hides its rear suspension to mimic a rigid frame, the Springer Classic features the counter-balanced Twin Cam engine. This design allows the engine to be rigid-mounted to the frame, providing a more direct mechanical feel without the high-frequency vibrations typically associated with non-balanced V-twins.
Maintenance Guide & Technical Specs
Lubrication System
For optimal thermal stability in the air-cooled Twin Cam engine, MotoSpecsLab recommends SAE 20W50 oil. The total refill capacity including filter change is 2.9 Liters. Given the heat generated by the rear cylinder, synthetic fluids are preferred for high-ambient temperature riding.
Tires and Contact Patch
The FLSTSC utilizes a traditional 16-inch wheel setup both front and rear, emphasizing a fat, nostalgic profile.
- Front: 130/90B16 – Maintain at 36 psi (2.5 bar).
- Rear: 150/80B16 – Maintain at 36 psi (2.5 bar) for solo riding, or 40 psi (2.8 bar) when carrying a passenger or heavy luggage.
Checking the Springer linkage for lubrication every 2,500 miles is critical to prevent binding and ensure the longevity of the bronze bushings.
Electrical & Ignition
The ignition system relies on 6R12 spark plugs. Gap these to 0.038–0.043 inches. The starting power is provided by the 65989-97C battery, a high-CCA (Cold Cranking Amps) unit designed to turn over the high-compression V-twin pistons.
Professional Verdict
The FLSTSC Softail Springer Classic is more than a styling exercise; it is a specialized piece of machinery that requires specific mechanical sympathy. The Springer front end requires periodic “fall-away” adjustments and rocker bearing lubrication that standard telescopic forks do not. For the collector or enthusiast, it remains one of the most mechanically engaging motorcycles produced in the 21st century.