The 1970 Honda CB350 delivered brisk performance for its 325-350cc class, with typical figures around 34 horsepower at the engine (crank) and roughly 25–28 horsepower at the rear wheel, depending on market, condition, and tuning. These numbers reflect the era’s design and testing standards and remain a touchstone for collectors and restorers today.
How much horsepower did it produce?
Understanding the figure requires distinguishing between engine output and actual riding power. The commonly cited numbers for the 1970 CB350 are:
- Crank horsepower (engine output): approximately 34–36 hp at about 8,000–9,000 rpm
- Rear-wheel horsepower (to the ground): typically about 25–28 hp, depending on drivetrain efficiency, exhaust, and overall condition
These figures can vary by market and model code. U.S.-market bikes from that era often followed similar ranges, while bikes destined for other regions could show slight tuning differences. Restorations or vintage assessments may also report different “net” or “gross” numbers depending on testing methodology.
What these numbers mean for riders then and now
In practical terms, the CB350 offered lively acceleration and a lively mid-range ride for its displacement class. With a light, agile chassis and a peaky powerband around the 8,000–9,000 rpm mark, riders experienced a spirited feel without the high-rev torque of larger modern bikes. Top speed typically sat in the neighborhood of 95–105 mph in stock configuration, with variations arising from gearing, exhaust setup, and condition.
Context: how horsepower is measured on a classic bike
Horsepower figures on vintage Hondas are often cited as crankshaft outputs (gross engine power) in manufacturer literature, while rear-wheel numbers reflect real-world delivery after drivetrain losses. When evaluating a CB350 today, it’s useful to separate:
- Engine output (crank horsepower): the theoretical power produced by the engine itself
- Rear-wheel output: practical power delivered to the road after losses from the transmission, chain, sprockets, and tires
For collectors and restorers, these distinctions matter because matching the bike’s original spec—including exhaust, carburetion, and compression—affects both performance and value.
Why year-to-year numbers can differ
Different markets and model codes within the CB350 line saw small adjustments over years. Engine tuning changes, carburetor settings, and exhaust configuration could nudge horsepower by a few tenths of a horsepower. When searching vintage specs, it’s best to verify the specific year and market code (for example, US vs non-US releases) to understand the expected power output.
Summary
For the 1970 Honda CB350, typical engine output was about 34–36 hp at the crank, with rear-wheel output generally in the mid-20s (around 25–28 hp). These figures reflect the bike’s performance in its era and remain a useful guide for enthusiasts assessing condition, restoration needs, or historical context.