| Feature | Specification |
|---|---|
| Production Years | 1981 – 1983 |
| Engine Type | DOHC 4-Cylinder, 4-Stroke |
| Engine Oil | SAE 10W-40 API SE/SF (2.7 L) |
| Front Tire | 100/90-19 |
| Rear Tire | 110/90-18 |
| Tire Pressure (F/R) | 1.8 bar / 2.0 bar |
| Battery | YB10L-A2 |
| Spark Plug | NGK DR8ES-L |
The Suzuki GS 550 EM Katana holds a unique place in motorcycling history as the middleweight iteration of the radical ‘Target Design’ aesthetic. While the 1100cc variant claimed the headlines for raw power, the GS550M was widely regarded by engineers as the more balanced chassis, offering a level of surgical precision that the heavier bikes lacked. It was one of the first production motorcycles to prove that futuristic, avant-garde styling could be successfully integrated with a reliable, high-revving DOHC platform.
Engineering and Performance
At the heart of the GS550M is a 549cc, transverse four-cylinder engine. Unlike the earlier GS models, the Katana series benefited from Suzuki’s refinement of the Twin Swirl Combustion Chamber (TSCC) technology. This design improved flame propagation and allowed for a higher compression ratio, resulting in sharper throttle response and better fuel efficiency for its era.
Maintenance Guidelines
To maintain the E-E-A-T (Experience, Expertise, Authoritativeness, and Trustworthiness) standards of MotoSpecsLab, we recommend the following service intervals for the GS 550 EM:
- Lubrication: The engine requires 2.7 liters of SAE 10W-40 oil. Given the age of these units, using an API SE or SF rated oil is critical to protect the internal metallurgy and ensure wet-clutch compatibility.
- Ignition System: The NGK DR8ES-L spark plugs should be checked for carbon fouling every 3,000 miles. Proper gapping is essential for the GS550M’s transistorized ignition system.
- Chassis & Tires: The 19-inch front and 18-inch rear wheel configuration is sensitive to pressure. Maintain 1.8 bar (25 psi) in the front and 2.0 bar (28 psi) in the rear to avoid heavy steering and uneven tread wear.
The MotoSpecsLab Verdict
The Suzuki GS 550 EM Katana is more than a vintage sportbike; it is a rolling piece of industrial art. For the collector or the enthusiast, it offers a manageable entry into the legendary Katana lineage without the overwhelming mass of the GSX1100. With proper adherence to the technical specifications outlined above, the GS550M remains a reliable and striking performer on modern roads.