1983 Honda CR250 Specifications and Specs

Specifications and workshop reference information for the 1983 Honda CR250, including engine, chassis, service data and setup details.

Note: Specs are compiled from factory data, manuals and owner feedback. Bikes vary — if yours is different, jump into the forum and share it.

1983 Honda CR250

General Specifications

Engine TypeSingle-cylinder, two-stroke, liquid-cooled, reed valve
Displacement246 cc
Bore × Stroke66.4 × 72.0 mm
Compression Ratio8.4:1
Maximum Power43 hp @ 8,000 rpm
Maximum Torque39 Nm @ 7,000 rpm
CarburetorKeihin Piston Valve | Replacement Options
LubricationPremix
Fuel Mix Ratio32:1 | Premix Calculator
IgnitionCDI
Spark PlugNGK B9EV
Spark Plug Gap0.6 – 0.7 mm

Transmission

Transmission Type5-speed constant mesh
ClutchWet multi-plate
Primary Reduction3.250
Final Reduction3.500

Dimensions

Overall Length2,170 mm
Overall Width845 mm
Overall Height1,230 mm
Wheelbase1,485 mm
Ground Clearance325 mm
Seat Height935 mm
Fuel Tank Capacity7.5 L
Dry Weight96.5 kg
Bearing Sizes Bearing Finder

Chassis

Frame TypeSteel single cradle
Caster Angle27.0°
Trail118 mm
Front SuspensionShowa telescopic forks | Fork Oil Levels
Rear SuspensionPro-Link single shock | Rear Suspension Setup
Front Suspension Travel300 mm
Rear Suspension Travel280 mm

Brakes & Wheels

Front Tire90/80-21 | Tyre Size Guide
Rear Tire140/80-18 | Tyre Size Guide
Front BrakeDrum
Rear BrakeDrum

Service Data

Transmission Oil Capacity750 cc
Spark PlugNGK B9EV
Spark Plug Gap0.6 – 0.7 mm
Main Jet#400
Pilot Jet#42
NeedleNot Published
Float Height16 mm
Air Screw1½ turns out
Chain Type520
Standard Sprockets14T / 49T
Starting SystemKick Start

250cc Other Specs

1983 Honda CR250R – When Honda’s 250 Package Came Together

The 1983 Honda CR250R arrived during one of the most intense periods of motocross development. Liquid cooling, rising-rate suspension and increasingly sophisticated chassis design were rapidly changing what riders expected from a competition motorcycle. Honda had already introduced many of these ideas on earlier CR models, but by 1983 the pieces were beginning to work together as a much more complete package.

Honda concentrated heavily on reducing weight and lowering the motorcycle’s centre of gravity. Aluminium components were used extensively, while the radiators were positioned low and the redesigned low-mounted fuel tank helped keep mass closer to the centre of the motorcycle. Combined with the narrow seat and slim bodywork, the CR250R allowed the rider to move around easily and change direction quickly.

The liquid-cooled 249cc two-stroke engine also received considerable development. Changes to the cylinder, porting, compression, reed induction and ignition helped produce a broader and more useful spread of power. Correct setup of the Keihin carburettor remained important, but when properly tuned the Honda delivered strong acceleration without requiring the rider to constantly chase a narrow powerband.

That broader delivery was valuable on the track. Riders could carry a taller gear through corners and feed in the clutch when necessary rather than constantly shifting to keep the engine on the pipe. For vintage racers today, that usable engine character remains one of the attractions of a properly sorted 1983 CR250R.

Handling became one of the Honda’s defining strengths. Revised chassis geometry, reduced weight and careful mass centralisation produced a motorcycle that responded rapidly to rider input. The 43 mm Showa front forks offered adjustable compression damping and represented sophisticated suspension equipment for a production motocrosser of the period.

At the rear, Honda continued developing its Pro-Link rear suspension. The Showa shock offered compression and rebound adjustment, giving racers considerably more tuning potential than motocross motorcycles had offered only a few years earlier. For owners restoring one today, worn linkage bushes, bearings and shock components can dramatically change the way the motorcycle handles, so returning the system to proper working condition is well worth the effort.

Braking still belonged to the previous generation. The 1983 CR250R used drum brakes at both ends, although Honda’s front drum was regarded as an effective brake in its day. Disc brakes were rapidly approaching, making the 1983 model an interesting snapshot of motocross caught between two technological eras.

For restorers, originality can now be as challenging as mechanical condition. Many CR250Rs were raced hard, modified and repaired with whatever components were available. Exhausts, bodywork, suspension parts and other model-specific pieces may have been changed several times during a bike’s life, so identifying year-correct parts before starting a restoration can save considerable expense later.

The significance of the 1983 CR250R comes from the complete package rather than one revolutionary component. It combined a strong but manageable engine, lightweight feel, quick handling and increasingly sophisticated suspension.

Honda had spent several seasons developing those ideas. By 1983, they had turned them into one very serious CR250R.

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