The Honda NS400R was a street-legal road-oriented
two-stroke
A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a Thermodynamic power cycle, power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being comple ...
sport bike
A sport bike (sports motorcycle, or sports bike) is a motorcycle designed and optimized for speed, acceleration, braking, and cornering on asphalt concrete race tracks and roads. They are mainly designed for performance at the expense of comfor ...
produced by Honda Motor Co., Ltd between 1985 and 1987.
The NS400R was inspired by Honda's
NS500
The Honda NS500 is a 500cc Grand Prix racing motorcycle of the early 1980s, powered by a two-stroke V3 engine. Created as a replacement for the innovative but unsuccessful four-stroke NR500, the bike went against Honda's preference for four-stroke ...
(also known as the RS500R) 500cc GP-bike ridden by
Freddie Spencer
Frederick Burdette Spencer (born December 20, 1961), sometimes known by the nickname Fast Freddie, is an American former world champion motorcycle racer. Spencer is regarded as one of the greatest motorcycle racers of the early 1980s.
Motorcycle ...
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The NS400R is the largest-displacement, street-legal two-stroke road bike that Honda produced. The limited-production NS400R was only sold from 1985 to 1988 and traces its lineage back to 1979. Honda was cleaning up in 500cc class motocross racing with two-stroke engines, but its four-stroke-powered World Grand Prix road bikes were lagging behind the competition. After internal deliberation over its four-stroke racing heritage, Honda pushed forward into two-stroke development. The water-cooled NS500 fused the power of three two-stroke motocross engines into a compact and lightweight V-3 configuration that produced 120 HP at 11,000 RPM. Freddie Spencer grabbed Honda's first 500cc class win in 15 years on an NS500 in 1982, and then rode a lighter and more powerful NS500 to a 1983 500cc World Championship. The following year, Honda manufactured a limited-production version of the championship racer for privateers called the RS500 that was a near duplicate of the works machine without the specialized exhaust. Yamaha and Suzuki had already released street-legal replica racers, and Honda answered the challenge with the NS400R in 1985. The 387cc liquid-cooled two-stroke V-3 cranked out 72 HP at 9,500 RPM with triple flat-slide carburetors, and a 6-speed transmission wet clutch combination got the power to the ground. TRAC anti-dive front forks and a Pro-Link rear suspension joined a box section alloy frame and triple disc brakes with dual-piston calipers. The road-going replica racer was a street-legal facsimile of the NS500 V-3 that Fast Freddie rode past his 4-cylinder competition to become the youngest ever world champion at 21 years old. Honda discontinued the NS400R in 1988.
NS400R
Two-stroke motorcycles
V3 engines
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