🏷️ Basic Information

Make:

Kawasaki

Model:

GPX250R (EX250)

Year:

1988

Chassis Code:

EX250-F

Engine Code Prefix:

EX250FE

👋 Introduction

Market Segment:

Sportbike / Sport-touring motorcycle targeting entry-level to intermediate riders seeking performance and reliability.

Key Competitors:

Yamaha FZR400, Honda CBR400 (where available), Suzuki GSX-R400 (early models), Ninja 250R predecessors/contemporaries.

Model Highlights:

Compact and agile handling, reliable parallel-twin engine, aerodynamic fairing, distinctive GP styling for its era.

Usefulness For Owners:

Empowers owners to perform routine maintenance, diagnose issues, and execute repairs, saving on labor costs and maintaining optimal performance.

Manual Purpose:

This manual provides the necessary technical information for the proper servicing and repair of the 1988 Kawasaki GPX250R (EX250), enabling technicians and knowledgeable owners to maintain the vehicle to factory specifications.

📋 Manual Details

Primary Coverage:

Complete Service and Repair Procedures for the 1988 Kawasaki GPX250R (EX250)

Secondary Coverage:

Maintenance, Troubleshooting, Electrical Systems, Engine Rebuild, Chassis Components, Suspension, Brakes

Estimated Page Count:

Approx. 300-400 pages (typical for a comprehensive service manual of this era)

Manual Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

Supplement (suggests it may be an addendum to a base manual, or a standalone for specific model year updates)

📖 Manual Coverage

Engine Mechanical:

Engine disassembly, assembly, inspection, valve adjustment, piston and cylinder ring replacement, crankshaft and connecting rod inspection, camshaft timing, lubrication system overhaul.

Fuel System:

Carburetor removal, disassembly, cleaning, adjustment (jetting, float levels), fuel pump operation (if applicable), fuel tank and lines.

Ignition System:

CDI system inspection, ignition coil testing, spark plug specifications, timing adjustment procedures.

Cooling System:

Radiator inspection, coolant specifications, thermostat operation, fan operation (if applicable).

Transmission:

Gearbox disassembly, inspection, clutch operation, cable adjustment, lubrication.

Chassis Suspension:

Front fork disassembly, inspection, oil change, seal replacement, rear shock absorber inspection and adjustment, swingarm bearing service.

Brakes:

Brake caliper inspection, pad replacement, hydraulic system bleeding, master cylinder service, disc and drum brake maintenance.

Electrical System:

Wiring diagrams, lighting system troubleshooting, battery maintenance, starter motor inspection, charging system (alternator/stator) testing, fuse and relay identification.

Bodywork And Frame:

Fairing removal and installation, seat, fuel tank mounting, frame inspection, steering head bearing service.

Scheduled Maintenance:

Detailed service intervals for oil changes, filter replacements, spark plugs, chain adjustment, brake checks, and lubrication.

Troubleshooting Guides:

Systematic diagnostic procedures for common problems, fault finding charts, and symptom-based repair advice.

Disassembly And Assembly:

Step-by-step instructions with accompanying diagrams for component removal, overhaul, and reinstallation.

Adjustment Procedures:

Precise instructions for adjusting critical components like carburetor synchronization, clutch play, brake levers, and suspension settings.

Torque Specifications:

Essential torque values for critical fasteners to ensure proper assembly and prevent damage.

Depth Of Coverage:

Comprehensive, covering basic maintenance to full engine and gearbox rebuilds, including advanced diagnostic techniques for the era.

Diagnostic Focus:

Emphasis on identifying and rectifying mechanical and electrical faults using standard tools and measurement techniques.

📊 Manual Specifications

Digital Format Quality:

If digital (PDF), expect clear scans with searchable text and high-resolution diagrams for effective use.

Print Quality Description:

High-quality printing with durable paper, designed for workshop use, ensuring legibility of diagrams and text.

Binding Type Description:

Typically perfect bound or spiral bound for ease of use, allowing the manual to lay flat during work.

Paper Type Description:

Durable, often glossy or semi-gloss paper to withstand grease and repeated handling in a workshop environment.

⚙️ Engine Specifications

Engine Type:

4-stroke, Liquid-cooled, DOHC, Parallel-twin

Displacement:

248 cc

Bore X Stroke:

55.0 mm x 52.4 mm

Compression Ratio:

11.5:1

Valve Configuration:

DOHC, 4 valves per cylinder

Horsepower Rating:

Approx. 35-40 HP @ 11,000 RPM (typical for the era and displacement, actual may vary)

Torque Rating:

Approx. 17-19 lb-ft @ 9,000 RPM (typical for the era and displacement, actual may vary)

Carburetor Type:

Dual Keihin CVK30 (Constant Velocity Carburetors)

Fuel Capacity:

16 Liters (4.2 US gal)

Oil Type Specification:

API SE, SF, or SG classification, SAE 10W-40 viscosity recommended (refer to manual for precise specification).

Ignition System:

Digital CDI (Capacitor Discharge Ignition)

Engine Mounting:

Transverse mounted

🔧 Transmission

Transmission Type:

Constant Mesh 6-speed

Clutch Type:

Wet, multi-plate

Drive Method:

Sealed O-ring chain

Transmission Oil Type:

API GL-4, SAE 80 or 85W gear oil (refer to manual for precise specification).

1St Gear Ratio:

2.750 (33/12)

2Nd Gear Ratio:

1.875 (30/16)

3Rd Gear Ratio:

1.500 (27/18)

4Th Gear Ratio:

1.250 (25/20)

5Th Gear Ratio:

1.090 (24/22)

6Th Gear Ratio:

1.000 (23/23)

📐 Dimensions

Length:

Approx. 2,020 mm (79.5 in)

Width:

Approx. 720 mm (28.3 in)

Height:

Approx. 1,145 mm (45.1 in)

Wheelbase:

Approx. 1,365 mm (53.7 in)

Dry Weight:

Approx. 145 kg (320 lbs)

Wet Weight:

Approx. 158 kg (348 lbs)

Front Tire Size:

110/80-17 M/C 57H

Rear Tire Size:

130/70-17 M/C 62H

Front Wheel:

17 inch

Rear Wheel:

17 inch

Frame Type:

Semi-double cradle, Steel tubing

Front Suspension Type:

Telescopic fork, Coil spring, Oil damped

Rear Suspension Type:

Uni-Trak system, Gas/Oil-damped shock, Adjustable preload

🛡️ Safety Features

Braking System:

Front: Hydraulic disc, Rear: Drum (some markets may have optional disc)

Lighting:

Halogen headlight, LED tail light, turn signals.

💡 Technology Features

Instrument Cluster:

Analog tachometer, speedometer, odometer, trip meter, coolant temperature gauge, indicator lights (neutral, oil pressure, turn signals, high beam).

ABS:

Not typically equipped on this model; ABS was not a common feature on 250cc sportbikes in 1988.

🔧 Maintenance

Oil Change Interval:

Every 3,000-6,000 km (1,800-3,700 miles) or annually, whichever comes first. Refer to manual for exact recommendation.

Spark Plug Replacement:

Typically every 10,000-15,000 km (6,000-9,000 miles). Refer to manual for specific type and gap.

Valve Clearance Check:

Initial check around 1,000 km, then every 6,000-10,000 km. Crucial for engine performance.

Coolant Type:

Ethylene glycol-based antifreeze and water mixture (50/50 ratio typically). Refer to manual for specific type.

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid. Refer to manual for specific requirement.

Common Wear Items:

Cam chain tensioner (can become noisy), carburetor synchronization drift, fork seal leaks, worn clutch plates with high mileage.

Electrical Issues:

Failing voltage regulator/rectifier can cause battery charging problems; corroded electrical connectors.

Chain Care:

Regular cleaning, lubrication, and tension adjustment are critical for drivetrain longevity and performance.

📚 Vehicle History

Kawasaki Legacy:

Kawasaki Heavy Industries has a long history of innovation in motorcycle manufacturing, known for performance and reliability, particularly in sportbike and motorsport applications.

Gpx250R Lineage:

The GPX250R (EX250) was a significant model in Kawasaki's 250cc sportbike lineup, evolving from earlier models and paving the way for subsequent Ninja 250 variants. It emphasized aerodynamic styling and sporty performance.

Production Period:

The GPX250R was produced through the late 1980s and early 1990s, with continuous updates and variations across different markets.

🏆 Awards & Recognition

Industry Reputation:

The GPX250R was generally well-regarded for its value, sporty aesthetics, and ease of use, making it a popular choice for new riders and commuters.