Approximately 105 horsepower at the crank.
The 2004 Honda CBR600F4i—often referred to simply as the F4i—packs a 599cc inline-four with fuel injection. Horsepower figures published by manufacturers represent crank horsepower, i.e., what the engine can produce before drivetrain losses. Real-world results vary with testing conditions, maintenance, and elevation. This article lays out the official figure and what it means for riders today.
Engine and performance context
Understanding where the number comes from helps explain how the bike feels on the road or track. The F4i uses a high-revving, torquey midrange delivery typical of 600cc sport bikes of its era, with a redline around 12,000 rpm and a six-speed gearbox designed to maximize the engine’s power curve.
Key specs
For quick reference, here are the core figures for the 2004 F4i:
- Displacement: 599 cc
- Engine configuration: 4-stroke inline-4, DOHC, 16 valves
- Induction: Electronic fuel injection
- Horsepower: 105 hp (crank) @ approximately 12,000 rpm
- Torque: ≈59 Nm (43.5 lb-ft) @ approximately 9,000 rpm
- Redline: ≈12,000 rpm
- Transmission: 6-speed
- Wet weight: ≈419 lb (190 kg)
Note: These figures reflect the official specifications. Real-world output can differ due to testing method, air density, altitude, and condition of the motorcycle.
What the numbers mean for riders
With a peak output around 12,000 rpm, the F4i favors a strong top-end punch suitable for aggressive street riding and track sessions. Drivetrain losses mean rear-wheel horsepower typically sits lower than the crank spec; on a standard dyno or street test, riders often see roughly the mid-80s to mid-90s horsepower at the rear wheel, depending on tuning and condition.
Summary
The 2004 CBR600F4i is widely cited as producing about 105 horsepower at the crank from its 599cc inline-four engine, with a high-revving character that emphasizes top-end acceleration. While the official figure remains a useful benchmark, actual performance at the wheel varies by setup, measurement method, and conditions.