| Attribute | Specification |
|---|---|
| Model | Dyna Super Glide Custom – FXDCI |
| Production Years | 2005–2006 |
| Engine Oil | 20W50 HD 360 / SYN3 (2.8 L) |
| Front Tire | 100/90-19 57H |
| Rear Tire | 150/80B16 71H |
| Battery | 65989-97C |
| Spark Plugs | HD-6R12 |
A pivotal moment in Milwaukee engineering occurred during the 2005-2006 production cycle of the FXDCI. While the Dyna family was long celebrated for its rubber-mounted engine and twin-shock rear suspension, the 2006 FXDCI specifically marked the transition to the 6-speed Cruise Drive transmission and the introduction of a more robust 49mm front fork assembly, significantly increasing torsional rigidity compared to the previous 39mm iterations.
Engineering Overview
The FXDCI (the ‘I’ denoting Fuel Injection) features the Twin Cam powertrain, a design characterized by its dual-camshaft configuration and internal oil pump. The 2005 models utilized the 88ci (1450cc) engine, while the 2006 update served as the bridge to the modern Dyna era, incorporating a redesigned primary housing and a sturdier frame. The fuel injection system on these models provides superior throttle response and altitude compensation compared to their carbureted predecessors.
Maintenance Specifications
For optimal engine longevity, MotoSpecsLab recommends adhering to the following fluid and hardware specifications:
- Lubrication: Use 2.8 Liters of 20W50 Harley-Davidson 360 or Screamin’ Eagle SYN3. Synthetic oils are preferred for high-ambient temperature environments to mitigate thermal breakdown.
- Ignition: Ensure spark plug gaps are set correctly using the HD-6R12 plugs to maintain combustion efficiency.
- Electrical: The 65989-97C battery provides the necessary cold cranking amps (CCA) to overcome the high-compression resistance of the Twin Cam engine.
Tire & Chassis Management
Handling characteristics on the FXDCI are highly sensitive to tire pressure. The 19-inch front wheel provides a classic cruiser aesthetic while maintaining flickability. Correct pressures are vital:
- Front (100/90-19): 2.1 bar (30 psi)
- Rear (150/80B16): 2.5 bar (36 psi) for solo riding; increase to 2.8 bar (40 psi) for two-up riding or heavy luggage.
MotoSpecsLab Verdict
The FXDCI remains a favorite among purists for its balance of chrome aesthetics and mechanical simplicity. The 2006 model, in particular, is a “sweet spot” for collectors, offering the modern 6-speed gearbox while retaining the classic Dyna silhouette. Proper maintenance of the cam chain tensioners (on 88ci models) and primary drive components ensures this machine remains a reliable long-distance cruiser.
Frequently Asked Questions
Q: Can I use automotive 20W50 oil?
A: No. Motorcycle-specific oil contains additives for wet clutches and air-cooled engine temperatures that automotive oils lack.
Q: How often should I check tire pressures?
A: Before every major ride or at least once every two weeks, as the FXDCI’s handling degrades significantly with even a 5 psi drop.