| Attribute | Specification |
|---|---|
| Model Series | PC25 (CBR 600 F2) |
| Production Years | 1991–1994 |
| Engine Oil | SAE 10W-40 (3.3 L) API SE/SF/SG; JASO MA2 |
| Tire Size (Front/Rear) | 120/70 ZR 17 / 160/60 ZR 17 |
| Spark Plugs | NGK CR9EH-9 / Denso U27FER9 |
| Battery Type | YTX9-BS |
The Honda CBR 600 F PC25, commonly known as the “F2,” represents a pivotal moment in motorcycling history. While its predecessor was a capable machine, the PC25 was the first middleweight motorcycle to feature a revolutionary cam-chain drive relocated to the right side of the engine. This engineering shift allowed for a significantly narrower engine profile and a more compact cylinder head, effectively setting the blueprint for the modern supersport geometry we see today.
Technical Engineering Overview
The PC25 was designed with a “Total Control” philosophy. Its liquid-cooled, 599cc inline-four engine delivered roughly 100 horsepower, a staggering figure for the early 90s. The introduction of 34mm flat-slide CV carburetors ensured crisp throttle response, while the inclusion of cartridge-style front forks—a technology previously reserved for premium liter-bikes—provided the F2 with handling characteristics that dominated both the street and the AMA Supersport circuit.
Maintenance Guide & Essentials
For the modern collector or enthusiast, maintaining the PC25 requires adherence to specific technical tolerances to preserve its high-revving nature.
Lubrication System
The PC25 engine is remarkably robust but sensitive to oil quality. Use a high-quality SAE 10W-40 oil. It is critical to ensure the oil meets JASO MA2 standards to prevent clutch slippage, as the PC25 utilizes a wet multi-plate clutch system. The total capacity for an oil and filter change is 3.3 liters.
Tires and Chassis Dynamics
Handling precision is dictated by tire maintenance. The PC25 runs on a 120/70 ZR 17 front and a 160/60 ZR 17 rear. For optimal turn-in and stability, maintain 2.5 bar (36 psi) in the front. For the rear, while 36 psi is standard for solo riding, increasing to 2.9 bar (42 psi) is recommended for high-speed touring or when carrying a passenger to prevent carcass deformation.
Electrical and Ignition
The ignition system relies on NGK CR9EH-9 plugs. Given the high-revving nature of the PC25, ensure the gap is checked every 12,000 km. The electrical system is powered by a YTX9-BS battery; if the bike is stored, a trickle charger is essential to prevent the sensitive regulator-rectifier from overworking upon startup—a known weak point in 90s Hondas.
MotoSpecsLab Verdict
The Honda CBR 600 F PC25 is more than a vintage sportbike; it is a masterclass in balance. Its over-engineered internals mean that with proper fluid intervals and valve clearances, these machines easily surpass the 100,000-kilometer mark. It remains the gold standard for riders seeking a bridge between classic analog feel and modern performance reliability.