| Specification | Data |
|---|---|
| Production Years | 1986 – 1989 |
| Engine Oil | SAE 10W-40 (API SE/SF/SG, JASO MA/MA2) (2.6 L) |
| Tires (F/R) | F: 100/90-18 56V / R: 110/90-18 61V |
| Tire Pressure | F: 2.0 bar (29 psi) / R: 2.25 bar (33 psi) |
| Battery Type | YB12A-A |
| Spark Plug | NGK DP8EA-9 (Gap: 0.8–0.9 mm) |
Unlike its predecessors in the CB series, the Honda CB 450 S (PC17) represents a unique chapter in Honda’s engineering history. While most mid-range commuters of the mid-80s relied on traditional steel cradle frames, the PC17 was built around a distinctive trellis-style perimeter frame. This design wasn’t just aesthetic; it was a deliberate move to improve torsional rigidity and handling, specifically catering to the demanding European market where this model found its greatest success.
Engineering & Performance
The heart of the PC17 is an air-cooled, SOHC, 3-valve-per-cylinder parallel twin. It utilizes a 180-degree crankshaft, which provides that characteristic rhythmic exhaust note and a punchy mid-range torque curve. Coupled with a 6-speed transmission, the CB 450 S was engineered to be more than just a learner bike; it was a sophisticated machine that offered stability and predictable dynamics through its unusual frame architecture and dual front disc brakes.
Maintenance Guide
Lubrication System
To maintain the health of the SOHC valvetrain, regular oil changes are imperative. The PC17 requires 2.6 liters of SAE 10W-40. It is critical to use oil that meets JASO MA or MA2 specifications to ensure the wet clutch does not slip under load. We recommend high-zinc formulations (API SG) to protect the camshaft lobes from premature wear.
Ignition and Electrical
The electrical system is supported by a YB12A-A battery. For optimal combustion, the NGK DP8EA-9 spark plugs must be gapped precisely between 0.8 and 0.9 mm. Fouled plugs on this model often indicate a rich condition in the dual Keihin carburetors, which require periodic synchronization to maintain idle stability.
Chassis and Tires
The PC17 runs on 18-inch wheels front and rear, which contributes to its stable, neutral steering. The correct tire sizing is 100/90-18 for the front and 110/90-18 for the rear. Maintaining the factory-specified pressures of 2.0 bar (front) and 2.25 bar (rear) is essential to prevent heavy steering and ensure the longevity of the rubber.
Editor’s Verdict
The Honda CB 450 S – PC17 remains a standout example of 1980s functionalism. It is a robust, well-engineered motorcycle that rewards the owner who adheres to a strict maintenance schedule. Its trellis frame and reliable twin-cylinder engine make it a cult classic for those who value mechanical honesty over modern complexity.
Frequently Asked Questions
Q: How often should I change the oil?
A: For the PC17, we recommend an oil and filter change every 6,000 km (approx. 3,700 miles) or once per season.
Q: Can I use 10W-50 oil?
A: While 10W-40 is the standard, a 10W-50 JASO MA2 oil can be used in exceptionally hot climates to maintain viscosity at high operating temperatures.