| Parameter | Specification |
|---|---|
| Production Years | 1982-1983 |
| Engine Type | 248cc Single-Cylinder, 4-Stroke, OHC |
| Oil Requirement | 1.3 L – SAE 10W-40 JASO MA2 |
| Spark Plug | NGK DR8ES-L |
| Battery Type | YB9-B (12V) |
| Tire Size (Front/Rear) | 3.00-21 51S / 4.60-17 62S |
Engineering Highlight: The Honda CL 250 S (MD04) is historically significant for its “Crawler Gear” capability. While based heavily on the XL 250 R’s RFVC engine architecture, the CL 250 S featured a unique 6-speed transmission where the first gear was exceptionally short, designed to mimic a trials-bike crawling speed for navigating difficult terrain—a rare bridge between street-scrambler aesthetics and genuine utility performance.
Technical Review: The MD04 Architecture
The MD04 represents Honda’s early 80s philosophy of the ‘Street Scrambler.’ Unlike the more aggressive XL series, the CL 250 S utilized a lower seat height and a more accessible frame geometry. The heart of the machine is its single-cylinder OHC engine. While it produces modest power, its torque delivery is linear, making it a favorite for vintage enthusiasts who value reliability over raw speed.
The suspension setup, featuring telescopic forks and a Pro-Link rear mono-shock, was advanced for its time, providing a plush ride on gravel paths while maintaining stability on tarmac. However, the 21-inch front wheel remains a clear nod to its off-road DNA.
Maintenance Guide & Fluid Specifications
Engine Lubrication
For the MD04 engine to maintain its longevity, the oil must meet JASO MA2 standards to ensure the wet clutch does not slip. The total capacity is 1.3 liters of SAE 10W-40. Given the air-cooled nature of this engine, frequent oil changes (every 3,000 km) are recommended to prevent thermal degradation.
Ignition and Electrical
The ignition system relies on an NGK DR8ES-L spark plug. Always ensure the gap is set to 0.6-0.7mm. The electrical system is powered by a standard YB9-B lead-acid battery. Ensure terminals are clean, as the MD04’s charging system can be sensitive to resistance at the contacts.
Tires and Pressure Management
The CL 250 S uses a specific tire combination that balances stability and agility:
- Front: 3.00-21 51S
- Rear: 4.60-17 62S
Recommended Pressures: For solo riding, maintain 1.50 bar (22 psi) in both tires. Under maximum load or with a passenger, the rear pressure should be increased to 2.00 bar (28 psi) to prevent carcass deformation and overheating.
Frequently Asked Questions (FAQ)
What is the fuel capacity of the MD04?
The tank typically holds 9 liters, including a small reserve portion.
Can I use synthetic oil in the CL 250 S?
Yes, provided it is a JASO MA2 certified 10W-40 oil. However, many owners prefer semi-synthetic blends for vintage seals.
Where is the VIN located?
The VIN (Frame Number) is stamped on the right side of the steering head tube, beginning with the ‘MD04’ prefix.