While most 80cc motorcycles of the mid-1980s were utilitarian commuters, the Suzuki RG 80 Gamma (NC11A) was a distinct engineering outlier. It was born from the strict German ‘Leichtkraftrad’ regulations of the era, which capped displacement at 80cc and engine speed at 6,000 RPM (initially). Suzuki responded by miniaturizing the racing DNA of the legendary RG series, resulting in a liquid-cooled, steel-framed sportbike that offered a genuine ‘big bike’ feel for young riders.
| Component | Specification |
|---|---|
| Production Years | 1985 – 1996 |
| Engine Oil | SAE 10W-40 (API SE/SF) – 0.8 L |
| Spark Plug | NGK BR8ES |
| Tire Size (Front) | 80/100-16 45P |
| Tire Size (Rear) | 90/90-18 51P |
| Tire Pressure (F/R) | 1.75 bar / 2.00 bar |
| Battery | YB4L-B |
Engineering Overview
The NC11A is powered by a single-cylinder, two-stroke engine featuring Suzuki’s advanced (for the time) liquid cooling system. Unlike its air-cooled predecessors, the Gamma’s thermal stability allowed for consistent power delivery even under sustained high-load conditions. The chassis featured a perimeter-style frame and a distinctive 16-inch front wheel paired with an 18-inch rear, a configuration designed to provide sharp turn-in characteristics reminiscent of Grand Prix machinery.
Maintenance Guide
Lubrication System
The RG 80 Gamma utilizes a separate lubrication system for the engine (2-stroke oil) and a dedicated sump for the transmission. For the gearbox, MotoSpecsLab recommends 0.8 liters of SAE 10W-40 meeting API SE or SF standards. Ensure the bike is level when checking the oil sight glass or dipstick.
Ignition and Electrical
To maintain optimal combustion and prevent fouling—a common issue in small-displacement two-strokes—the NGK BR8ES spark plug must be gapped correctly and inspected every 3,000 km. The electrical system relies on a YB4L-B lead-acid battery; given the age of these machines, ensuring clean ground connections is vital for reliable starting.
Chassis and Tires
The handling of the NC11A is highly sensitive to tire pressure. Running the 80/100-16 front at 1.75 bar (25 psi) and the 90/90-18 rear at 2.00 bar (29 psi) is critical for maintaining the intended geometry. Over-inflating the front can lead to a ‘nervous’ front end, while under-inflation significantly slows the steering response.
Professional Verdict
The Suzuki RG 80 Gamma remains a milestone in the 80cc category. Its robust build quality and liquid-cooled engine make it a highly collectible classic today. For owners, meticulous adherence to the 0.8L oil capacity and the specific 16/18-inch tire pairing is the key to preserving the sharp handling that defined the Gamma series.
Frequently Asked Questions
Q: Can I use synthetic 10W-40 in the gearbox?
A: Yes, provided it is JASO-MA rated to ensure the wet clutch does not slip. However, the original API SE/SF mineral or semi-synthetic oils are historically sufficient.
Q: Why does the RG 80 use a 16-inch front wheel?
A: This was a trend in the 1980s to reduce gyroscopic inertia, allowing for faster flickability in corners, mimicking the 500cc GP bikes of the era.