Honda Nighthawk 650: A Comprehensive Look

The Honda Nighthawk series has carved a significant niche in the motorcycling world, celebrated for its blend of performance, reliability, and distinctive styling. Among its lineage, the CB650SC Nighthawk, often referred to as the "Nighthawk 650", holds a special place. This model represents a fascinating chapter in Honda's development, transitioning through different engine configurations and technological advancements. Understanding the specifics of the Nighthawk 650, particularly its engine, is key to appreciating its place in motorcycle history and its appeal to riders then and now.

The Genesis of the Nighthawk 650

Honda first introduced the Nighthawk line in the 1982 model year, offering a trio of displacements: the CB450SC, CB650SC, and CB750SC. These models, while borrowing from existing Honda platforms, featured enough distinct styling and mechanical improvements to warrant their own designation. The CB650SC Nighthawk, in its inaugural year, was equipped with Honda's final iteration of its SOHC (Single Overhead Camshaft) in-line four-cylinder engine. This powerplant was mated to a 5-speed transmission and featured a chain drive, along with Comstar wheels. This initial configuration set the stage for what would become a popular and evolving model.

Engine Specifications and Evolution

The question of what engine a 650 Nighthawk has is best answered by looking at its development over its production run. As mentioned, the 1982 model year saw the introduction of the CB650SC Nighthawk, powered by a SOHC, in-line four-cylinder engine. This engine was a reliable unit, providing a solid foundation for the bike's performance. However, Honda was always looking to innovate and improve.

The year 1983 brought about significant changes across the Nighthawk range. The CB650SC Nighthawk underwent a complete redesign. This overhaul resulted in a package that could rival the 750cc offerings from other manufacturers. Crucially, this redesign included the adoption of shaft drive, a move that significantly reduced maintenance requirements compared to the previous chain drive. Further enhancements included self-adjusting cam chains, improved braking systems, better handling dynamics, refined ergonomics, and an updated visual appeal. This new iteration of the 650 Nighthawk was a substantial leap forward, offering a more refined and user-friendly riding experience.

The SOHC motor was exclusively available for the Nighthawk 650 in its first year of production, 1982. From 1983 onwards, the redesigned CB650SC featured a different engine configuration, moving away from the SOHC design. This transition to shaft drive and other improvements solidified the Nighthawk 650's position as a competitive machine in its class.

The CB750SC Nighthawk and Tariffs

While the focus is on the 650, it's worth noting the context of the larger Nighthawk models. The CB750SC Nighthawk initially used the existing CB750 engine, a 16-valve, DOHC in-line four-cylinder, but with a restyled and redesigned chassis. However, in 1983, the U.S. government imposed strict tariffs on imported motorcycles exceeding 700cc, a measure intended to support Harley-Davidson. This led Honda to produce the 700 Nighthawk S for the 1984-1986 model years. This 700cc model featured an all-new DOHC engine with automatic cam chain tensioners and shaft drive, along with a small fairing for a sportier look. This model marked the end of the Nighthawk's initial run until its revival in the 1990s.

Nighthawk 650 Production Timeline

The production of the Nighthawk 650 followed a specific timeline:

It's important to note that the CB550SC was introduced in 1983 and dropped after that year, while the CB450SC had a more intermittent production schedule. The 650 Nighthawk saw its final production run in the 1985 model year.

The Nighthawk Revival

After a hiatus, Honda resurrected the Nighthawk series in the 1991 model year. The new Nighthawk lineup featured two models: a 250cc twin and a 750cc inline-four. The 750cc model, in particular, was a well-received machine, known for its excellent design and affordability. Honda largely kept the design of these revived Nighthawks unchanged, with minor updates like repositioning the helmet lock, colour changes, and a blacked-out engine in later models. However, the 750cc version eventually ceased production, leaving the Nighthawk name primarily associated with the smaller 250cc model, which became a popular choice for motorcycle training.

Performance and Handling

The CB750SC Nighthawk, which shares some lineage and design philosophy with the 650, incorporated high-performance and low-maintenance features. These included a rubber-mounted in-line four-cylinder engine, an oil cooler, 16 hydraulically adjusted valves, a hydraulic clutch, an automatic cam-chain tensioner, and fully electronic ignition. The shaft drive was lauded for its low lash and maintenance-free operation. The 16-inch front wheel, equipped with TRAC anti-dive technology and an integrated fork brace, contributed to nimble yet stable handling. The rear suspension typically featured VHD shocks with adjustable rebound damping and a box-section swingarm, ensuring a composed ride.

Common Questions and Ownership Insights

What engine does a 650 Nighthawk have?

The 1982 Honda CB650SC Nighthawk was equipped with a SOHC, in-line four-cylinder engine. From 1983 onwards, the CB650SC underwent a redesign and featured an improved engine configuration, along with the introduction of shaft drive.

When was the SOHC motor available for the Nighthawk 650?

The SOHC engine was available for the Nighthawk 650 exclusively during its first model year, which was 1982. Honda replaced it with a redesigned engine and shaft drive starting in the 1983 model year.

How many miles does a 1984 Honda Nighthawk 650SC have?

The mileage of a specific 1984 Honda Nighthawk 650SC can vary greatly depending on its history and maintenance. For example, one listed bike had 39,000 miles and was noted as being "great for parts or repair," having last been registered in 2008 and not running. Another described a "barn find" freshened up over 8 months with under 2,000 miles. It is crucial to check the specific mileage and condition of any used motorcycle.

Conclusion

The Honda Nighthawk 650, particularly the CB650SC model, represents a significant evolution in Honda's motorcycle design. From its initial SOHC engine and chain drive to its later, more refined shaft-driven configuration, the Nighthawk 650 offered a compelling package for riders seeking a blend of performance and practicality. Its journey through different engine technologies and design philosophies underscores Honda's commitment to innovation and rider satisfaction, cementing its place as a respected classic in the motorcycle community.