| Engine Type | 748cc Liquid-cooled 90° V4, Gear-driven DOHC |
|---|---|
| Production Years | 1986 – 1987 (RC24 G/H) |
| Oil Capacity | 3.1 Liters (SAE 10W-40) |
| Tire Sizes | F: 110/90-16 | R: 130/80-18 |
| Spark Plug | NGK DPR8EA-9 (0.8–0.9 mm gap) |
| Battery | YB12A-A (12V) |
In 1986, Honda faced a crisis of confidence following the camshaft failures of the previous VF series. The response was the VFR 750 F (RC24), a motorcycle so over-engineered that it remains a benchmark for reliability today. The defining technical highlight of this machine is its gear-driven camshaft system. By replacing timing chains with a precision gear train, Honda eliminated tensioner failures and created the iconic mechanical “whine” that has become the signature of the early VFR lineage.
Technical Review: The RC24 Legacy
The RC24 was more than just a fix; it was a revolution in sport-touring. Its aluminum twin-spar frame (diamond configuration) was significantly lighter and stiffer than contemporary steel frames. The 90-degree V4 engine provides perfect primary balance, resulting in smooth power delivery across the rev range. While the 105hp output was competitive, it was the 180-degree crankshaft and the revised oiling system that ensured these engines could easily surpass 100,000 miles with basic maintenance.
Maintenance Guide & Essentials
Engine Lubrication
For the RC24/G-H models, Honda specifies 3.1 liters of oil. We recommend high-quality SAE 10W-40 meeting API SE, SF, or SG standards. Modern synthetic oils are acceptable, but ensure they are JASO MA rated to prevent clutch slippage.
Chassis and Tires
The RC24 uses a period-specific wheel combination: a 16-inch front and an 18-inch rear. This setup provides quick turn-in but limits modern tire choices.
- Front: 110/90-16 59V (Pressure: 2.25 bar / 33 psi)
- Rear: 130/80-18 66V (Pressure: 2.50 bar / 36 psi solo, 2.80 bar / 41 psi pillion)
Ignition and Electrical
The ignition system relies on NGK DPR8EA-9 spark plugs. Maintaining a precise gap of 0.8–0.9 mm is critical for consistent combustion in the V4 chambers. The electrical system is powered by a YB12A-A battery. Note: The regulator/rectifier on these models can be a weak point; ensure cooling fins are clear of debris.
Frequently Asked Questions
Why are gear-driven cams better?
Gear-driven cams provide precise valve timing that never degrades due to chain stretch or tensioner wear, making the valve train virtually maintenance-free outside of periodic clearance checks.
Is the 16-inch front wheel an issue?
While it makes the bike very agile, tire selection is narrower than modern 17-inch wheels. Owners often look to specialized sport-touring tires like the Bridgestone Battlax series to maintain performance.