Honda 250 RC 166 1966 - Motorcycle specifications, price, reviews

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presentation of the 250 RC 166 1966

Nicknamed the "Honda 6", the RC 166 is one of the most famous GP machines in the 250 class. Its 6-cylinder engine was capable of staggering performance and engine speeds. Nearly 19,000 rpm, around 60 horsepower and tiny moving parts that had to withstand insane stresses.

Imagine the work of each connecting rod, barely longer than the width of your hand. They had to traverse the cylinder more than 300 times a second as the engine screamed out its maximum force. A block with so little inertia that it would stall if the driver didn't hold back the throttle a little when stationary.

Mike Hailwood shone brilliantly at its helm: his domination was disgusting (for the competition) as the British rider and the Japanese bike won almost all the races of the season (10 / 12).

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Published on 2/26/25
by Greg

Greg is the founder of Motoplanete—a website created in 2001 to share his passion with his friends and showcase as many motorcycle models as possible to his readers. Self-taught and a jack-of-all-trades, his discovery of the world of motorcycles led him to work as a photographer, rider, team manager, web developer, graphic designer, editorial assistant, and editor-in-chief.

Key facts Honda 250 RC 166 (1966) : What you need to know before you buy

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Model sold in 1966

Performance

Max speed : approximately 240 km/h (149.10 mph)

Specifications Honda 250 RC 166 1966

Chassis: Frame : Double interrupted steel cradle; Wheelbase : 1,385 mm (54.53 in); Dry weight : 112 kg (247 lb)

Front axle: Telescopic fork Ø 37 mm; drum brakes Ø 220 mm (8.66 in)

Transmission: 7 stage gearbox , manual; Secondary by chain

Rear axle: 2 lateral shock absorbers; drum brakes Ø 200 mm (7.87 in)

Motor: 6 cylinders online; 6 Keihin Ø 22 mm carburetors; Cooling system : combined air / oil; 2 ACT; 4 valves per cylinder; 249.42 cc; 60 ch (59.20 hp) to 18,000 rpm; 2.36 mkg to 17,000 rpm; Power-to-weight ratio : 1.89 kg/ch; Weight / torque ratio : 47.46 kg/mkg; Compression : 12 : 1

Practical information

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1966

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FAQ Your frequently asked questions about the 250 RC 166 1966

What is the power of the 250 RC 166?: The 250 RC 166 1966 develops a power of 60 ch (59.20 hp)
What is the torque of the 250 RC 166?: The maximum torque of the 250 RC 166 1966 is 2.36 mkg to 17,000 rpm.
What is the maximum speed of the 250 RC 166?: The 250 RC 166 1966 is capable of reaching a top speed of approximately 240 km/h (149.10 mph) on the track.
What is the weight of the 250 RC 166?: The 250 RC 166 1966 has a a dry weight of 112 kg (247 lb).