| Specification | Value |
|---|---|
| Model | Softail Deluxe (FLSTN) |
| Year | 2007 |
| Engine Oil | SAE 20W50 (3.3 L) |
| Front Tire | MT90B16 72H |
| Rear Tire | MU85B16 77H |
| Tire Pressure (F/R) | 2.48 bar (36 psi) / 2.48 bar (36 psi) |
| Battery Code | 65989-97C |
| Spark Plug | HD-6R12 |
Historical Engineering Highlight: The 2007 Softail Deluxe represents a pivotal moment in Harley-Davidson’s engineering timeline. This was the inaugural year for the Twin Cam 96B engine across the Softail lineup. Unlike its predecessor, the 88B, the 96B featured a longer stroke and incorporated the 6-Speed Cruise Drive transmission, significantly reducing RPMs at highway speeds and marking the end of the 5-speed era for the FLSTN platform.
Engineering Overview: The Twin Cam 96B Advantage
The ‘B’ designation in the FLSTN/07 engine signifies the use of internal counter-balancers, which are rigid-mounted to the frame. This design allows for the classic ‘Hardtail’ aesthetic while providing the rider with a vibration-dampened experience. The transition to the 1584cc (96 ci) displacement also saw the standardization of Electronic Sequential Port Fuel Injection (ESPFI), improving cold-start reliability and throttle response over previous carbureted or early EFI models.
Maintenance Guide & Fluid Dynamics
To maintain the structural integrity of the Twin Cam 96B, MotoSpecsLab recommends a strict adherence to fluid intervals. The 3.3-liter oil capacity should be filled with high-viscosity SAE 20W50 to ensure adequate lubrication of the pushrod valvetrain under high thermal loads.
- Lubrication: Use a high-quality synthetic 20W50. Check levels every 1,000 miles.
- Ignition: The HD-6R12 plugs are specifically gapped for the ESPFI system. Improper gapping can lead to knock-sensor errors.
- Electrical: The 65989-97C battery provides the necessary cold cranking amps (CCA) to turn over the high-compression 96ci cylinders.
Chassis and Contact Patch
The FLSTN/07 utilizes a unique tire combination to support its 700lb+ curb weight. The MU85B16 rear tire is slightly wider than standard 150mm tires, providing a larger contact patch for cruising stability. Maintaining the precise 2.48 bar (36 psi) pressure is critical; under-inflation leads to ‘cupping’ on the front MT90B16 tire, which negatively impacts the Deluxe’s characteristic low-speed maneuverability.
MotoSpecsLab Editorial Verdict
The 2007 FLSTN is the ‘sweet spot’ for collectors and riders alike. It combines the vintage ‘nostalgia’ styling of the 1950s with modern 21st-century powertrain reliability. While the 6-speed transmission was a massive upgrade, owners should periodically inspect the primary chain tensioner and compensator sprocket, which are known wear points for this specific generation.
Frequently Asked Questions
What spark plugs does the 2007 FLSTN use?
The 2007 Softail Deluxe uses HD-6R12 spark plugs.
How much oil does the 2007 Softail Deluxe take?
The engine oil capacity is 3.3 liters (approximately 3.5 US quarts) of SAE 20W50.
What is the correct tire pressure for the 07 Softail Deluxe?
Both the front and rear tires should be maintained at 2.48 bar, or 36 psi.