Horsepower for the 1981 CB750 varies by variant, but most models fall roughly between 60 and 85 horsepower at the engine. The sport-oriented CB750F tends to be on the higher end, while the standard and custom versions sit lower in the range.
In this article, we explore the main 1981 CB750 variants and their typical horsepower, noting how ratings can differ by market and year. We also explain the distinction between engine power (crank horsepower) and what you actually feel on the road (rear-wheel horsepower).
Variant-by-variant horsepower (1981 CB750)
The following figures reflect published engine power ratings (crank horsepower) for the 1981 CB750 lineup. Real-world rear-wheel horsepower is typically lower due to drivetrain losses, exhaust, and intake characteristics. Exact numbers can vary by market (U.S., Europe, etc.) and by individual bike condition.
CB750F Super Sport
The CB750F, the sport-focused version in the 1981 lineup, commonly delivered in the high 70s to mid-80s horsepower at the crank. In many markets around that year, published figures often place the F model in the roughly 75–85 hp range, with some variation by tuning and emissions controls.
CB750K Standard
The CB750K standard version typically produced around 60–70 horsepower at the crank in 1981, offering a balance of performance and everyday reliability characteristic of the standard motorcycle class.
CB750C Custom
The CB750C Custom generally ranged around 60–65 horsepower at the crank, tuned more for lower-end torque and street comfort rather than outright sprint performance.
Because horsepower figures were influenced by regional specifications, exhaust systems, and year-to-year tweaks, consult the specific bike’s original manuals or Honda data sheets for the precise figure corresponding to a given chassis number.
Performance context
Power is only one part of the picture. Weight, gearing, and chassis design also shape how a bike feels on the road. Across the 1981 CB750 line, riders could expect the sport-oriented F model to offer sharper acceleration and higher top speed, while the K and C variants prioritized rideability and daily usability. In practice, crank horsepower translates to lower rear-wheel horsepower once you account for drivetrain losses, so real-world acceleration will be somewhat modest compared with engine-rated figures.
Summary
The 1981 Honda CB750 lineup offered a spectrum of horsepower, roughly 60–70 hp for the Standard (K) and Custom (C) variants and about 75–85 hp for the Sport (F) variant, all measured at the engine crank. The exact figure depends on market, year, and specific tuning. For precise data on a given bike, refer to the original manuals or Honda’s period data sheets, and remember that wheel horsepower will be lower than crank horsepower.