| Attribute | Specification |
|---|---|
| Production Years | 1977–1988 |
| Engine Type | Parallel-Twin, 4-Stroke |
| Oil Capacity | 1.2 L |
| Oil Grade | SAE 10W-40 JASO MA/MA2 |
| Spark Plug | NGK D8EA |
| Front Tire | 3.00-17 4PR (1.75 bar / 25 psi) |
| Rear Tire | 3.25-17 6PR (2.00 bar / 28 psi) |
| Battery | 12N9-4B-1 (YB9-B) |
Engineering Highlight: The 12,000 RPM Small-Displacement Masterpiece
The Honda CB 125 T (Twin) holds a unique position in motorcycling history as one of the most sophisticated 125cc machines ever produced. Unlike the utilitarian single-cylinder commuters of its era, the CB125T featured a high-revving parallel-twin engine capable of reaching a screaming 12,000 RPM. This engineering choice provided a smooth power delivery and an exhaust note that mimicked much larger superbikes, making it a favorite for riders who valued technical precision over simple economy.
Technical Performance & Design
Produced between 1977 and 1988, the CB125T was designed to bridge the gap between learner-legal requirements and performance-oriented riding. The twin-cylinder layout offered a distinct advantage in heat dissipation and vibration control compared to its single-cylinder rivals. With its dual exhaust pipes and ‘Comstar’ wheels (on later models), the bike projected a premium aesthetic that remains highly collectible today.
Maintenance Guide
Engine Lubrication
To preserve the high-revving nature of the twin-cylinder engine, oil quality is paramount. The system requires 1.2 liters of SAE 10W-40 oil. It is critical to use oil with a JASO MA or MA2 certification to ensure the wet clutch does not slip under high-load conditions.
Ignition and Electrical
The CB125T utilizes NGK D8EA spark plugs. Given the high RPM ceiling, ensuring the gap is correct and the plugs are clean is essential for starting reliability. The electrical system is powered by a 12V 12N9-4B-1 (YB9-B) battery, which provides sufficient cranking power for the twin pistons.
Tires and Chassis
The bike features a 17-inch wheel setup. For optimal handling and safety, the front tire (3.00-17) should be maintained at 1.75 bar (25 psi), while the rear (3.25-17) requires 2.00 bar (28 psi). Proper inflation is vital to prevent uneven wear on these relatively narrow tires.
MotoSpecsLab Verdict
The Honda CB 125 T is a testament to Honda’s willingness to over-engineer even their entry-level machines. It offers a unique riding experience that modern 125cc bikes, restricted by tighter emissions and cost-cutting, simply cannot replicate. For the collector or the enthusiast, it remains a gold standard of small-displacement engineering.
Frequently Asked Questions
How much oil does the CB125T take?
The total oil capacity is 1.2 liters.
What is the tire pressure for the Honda CB 125 Twin?
The recommended pressure is 25 psi for the front and 28 psi for the rear.