| Component | Specification |
|---|---|
| Production Years | 1993 – 1995 |
| Engine Oil | SAE 10W-40 (API SE, SF, SG; JASO MA/MA2) – 2.9 L |
| Tires (F/R) | 110/80-17 57H / 130/80-17 65H |
| Spark Plugs | NGK CR8EH-9 / DENSO U24FER9 (0.8–0.9 mm gap) |
| Battery | YTX9-BS |
| Tire Pressure (F/R) | 2.25 bar / 2.50 bar (Solo) |
The Engineering Benchmark
The Honda CB 500 PC26 is not merely a commuter; it is a masterclass in over-engineering. Launched in 1993, the PC26 engine was famously designed with a service life target of 300,000 kilometers. Honda engineers achieved this by utilizing a liquid-cooled, 499cc parallel-twin with a gear-driven balancer shaft to minimize vibrations and a shim-under-bucket valve train for extreme durability at high RPMs. Unlike later iterations, the PC26 was manufactured in Japan and featured high-quality Nissin braking components and Showa suspension as standard.
Technical Maintenance Specifications
To maintain the legendary reliability of the PC26, adhering to precise fluid and hardware specifications is mandatory.
Lubrication System
The PC26 utilizes a wet-sump lubrication system. We recommend a high-quality semi-synthetic SAE 10W-40 oil. Total capacity during an oil and filter change is 2.9 Liters. Ensure the oil meets JASO MA2 standards to prevent clutch slippage, as the CB 500 uses a multi-plate wet clutch.
Ignition and Electrical
The ignition system relies on two spark plugs. The factory-recommended NGK CR8EH-9 or DENSO U24FER9 must be gapped strictly between 0.8 and 0.9 mm. For the electrical system, the YTX9-BS battery provides the necessary cold cranking amps to engage the starter motor reliably in all weather conditions.
Chassis and Tires
The PC26’s handling characteristics are highly sensitive to tire pressure. For solo riding, maintain 2.25 bar (33 psi) in the front and 2.50 bar (36 psi) in the rear. If carrying a pillion or heavy luggage, the rear pressure should be increased to 2.80 bar (41 psi) to maintain carcass stability and prevent overheating.
Pro-Tip: The PC26 Advantage
As the Editor-in-Chief of MotoSpecsLab, I often highlight that the PC26 is preferred by collectors over the later PC32 because of its Japanese manufacturing origin. One specific area to check during maintenance is the rear drum brake linkage and the cooling fan switch, which can become brittle over three decades of operation.
Frequently Asked Questions (FAQ)
- What is the valve clearance interval? Honda recommends checking clearances every 24,000 km.
- Can I use 10W-50 oil? While 10W-40 is standard, 10W-50 can be used in extremely hot climates, provided it meets the JASO MA/MA2 specification.
- Why is my idle inconsistent? This is often due to synchronized carburetor wear or aged vacuum lines, a common trait in the early PC26 models.