| Specification | Value |
|---|---|
| Model Code | JB06A |
| Production Years | 2022 – Present |
| Engine Oil | SAE 10W-30 JASO MA (0.9L change) |
| Tire Size | F: 120/70-12 | R: 130/70-12 |
| Tire Pressure | 2.0 bar (29 psi) Front/Rear |
| Battery | YTZ6V |
| Spark Plug | NGK CPR7EA-9 |
While many modern motorcycles rely on complex trellis or perimeter frames, the Honda ST 125 Dax (JB06A) pays homage to its 1969 predecessor by utilizing a unique pressed-steel T-bone frame. This engineering choice is not merely aesthetic; the frame houses the fuel tank internally, lowering the center of gravity and providing the iconic “Dachshund” silhouette that gave the Dax its name. At MotoSpecsLab, we recognize the JB06A as a masterclass in blending retro architecture with Euro-5 compliant powertrain technology.
Technical Review: The JB06A Platform
The heart of the JB06A is a 124cc air-cooled SOHC two-valve engine. Unlike its sibling, the Grom, which features a manual 5-speed gearbox, the Dax utilizes a 4-speed gearbox paired with a centrifugal clutch. This configuration allows for foot-shifting without a hand-operated clutch lever, making it exceptionally accessible for urban commuting while retaining mechanical engagement.
Suspension and Braking
The JB06A is equipped with 31mm inverted forks and twin rear shocks. Braking is handled by a single-channel ABS system acting on the front 220mm disc, utilizing an IMU-based system to prevent rear-lift under heavy deceleration—a high-tech addition for a bike in this displacement class.
Maintenance Guide
1. Lubrication System
For optimal longevity of the centrifugal clutch and gear set, use Honda 4-stroke oil SAE 10W-30 meeting the JASO T 903 standard MA.
- Capacity (Oil Change): 0.9 Liters
- Capacity (Disassembly): 1.1 Liters
Changing the oil every 6,000 km (or annually) is recommended for high-load urban use.
2. Ignition & Electrical
The Dax JB06A uses an NGK CPR7EA-9 spark plug. To ensure efficient combustion and easy starting, maintain a plug gap of 0.80 – 0.90 mm. The electrical system is powered by a YTZ6V battery; given the lack of a kick-starter on this modern iteration, maintaining battery health is critical.
3. Wheels and Tires
The Dax runs on 12-inch cast aluminum wheels.
- Front: 120/70-12 51L (Tubeless)
- Rear: 130/70-12 56L (Tubeless)
For balanced handling and fuel economy, maintain a consistent pressure of 2.0 bar (29 psi) in both tires.
Expert Verdict
The Honda ST 125 Dax JB06A is more than a nostalgia trip. It is a robustly engineered, low-maintenance machine that thrives in dense traffic. Its centrifugal clutch and pressed-steel frame make it a unique proposition in the current market, offering a tactile experience that scooters cannot replicate.