Model Variant:
EX250-J (Ninja 250R)
Years Covered:
2008, 2009, 2010, 2011, 2012
Chassis Code:
EX250J8F (2008), EX250J9F (2009), EX250JF (2010), EX250JFF (2011), EX250JGF (2012)
Segment:
Entry-level sportbike / Lightweight motorcycle
Target Audience:
New riders, commuters, budget-conscious sportbike enthusiasts.
Key Competitors:
Honda CBR250R, Suzuki GS500F (older models), Yamaha R3 (later competitor).
Design Philosophy:
Accessible performance, user-friendly operation, sporty styling.
Reputation:
Known for reliability, fuel efficiency, and affordability.
Engine Mechanics:
Complete engine overhaul, disassembly, assembly, valve adjustments, timing chain, lubrication system, cooling system.
Fuel System:
Carburetor inspection, cleaning, adjustment, fuel pump, fuel tank, fuel lines.
Transmission:
Clutch operation, gearbox inspection, disassembly, reassembly, shift mechanism, lubrication.
Electrical System:
Ignition system, starting system, charging system (alternator, battery), lighting, instrumentation, wiring diagrams.
Chassis Components:
Front fork (suspension), rear shock absorber, swingarm, steering system, wheel bearings.
Braking System:
Front and rear brake pad replacement, caliper service, master cylinder overhaul, brake fluid bleeding, brake line inspection.
Bodywork And Frame:
Fairing removal and installation, seat, fuel tank mounting, frame inspection.
Scheduled Maintenance:
Oil changes, filter replacements, chain maintenance, spark plug replacement, air filter cleaning/replacement, coolant checks.
Troubleshooting:
Diagnostic charts for common problems (e.g., engine not starting, poor performance, electrical issues).
Disassembly Assembly:
Step-by-step instructions for dismantling and reassembling major components and sub-assemblies.
Torque Specifications:
Precise torque values for all critical fasteners (engine, chassis, wheels).
Special Tools:
Identification and usage of specialized tools required for certain procedures.
Diagnostic Capabilities:
Detailed diagnostic procedures and symptom-based troubleshooting guides.
Rebuild Instructions:
Comprehensive instructions for complete engine and gearbox rebuilds.
Wiring Diagrams:
Detailed, color-coded electrical wiring diagrams for all circuits.
Searchability:
Likely text-searchable, allowing quick access to specific information.
Printability:
Designed for printing individual pages or sections as needed.
Image Resolution:
High-resolution images, diagrams, and illustrations for clarity.
Digital Format Notes:
N/A (Digital download)
Digital Format Notes:
N/A (Digital download)
Engine Type:
4-stroke, DOHC, parallel-twin
Displacement:
249 cc (249cc)
Bore X Stroke:
55.0 mm x 52.4 mm
Cooling System:
Liquid-cooled
Compression Ratio:
11.0:1
Horsepower:
Approximately 30-34 HP (at crankshaft, depending on market and tuning)
Torque:
Approximately 17-19 lb-ft (at crankshaft)
Carburetion:
Dual Keihin CVK34 carburetors
Fuel Tank Capacity:
18 Liters (4.8 US gal)
Oil Type Specification:
API SG, SH, SJ, SL or SM classification SAE 10W-40 or SAE 20W-50
Oil Capacity With Filter:
1.9 L (2.0 US qt)
Recommended Spark Plug:
NGK CR9EIA-9 or DENSO VUH27A
Transmission Type:
6-speed constant mesh
Clutch Type:
Wet, multi-disc
Gear Ratios:
1st: 2.750 (33/12), 2nd: 1.944 (35/18), 3rd: 1.556 (28/18), 4th: 1.333 (32/24), 5th: 1.150 (23/20), 6th: 1.000 (26/26)
Final Drive:
O-ring sealed chain
Transmission Oil Type:
API GL-4 SAE 80 or 85W-90 gear oil
Transmission Oil Capacity:
0.53 L (0.56 US qt)
Instrument Cluster:
Analog tachometer, digital speedometer, odometer, trip meter, fuel gauge, clock, indicator lights.
ABS:
Not typically available on this model year EX250-J.
Smart Features:
None (basic motorcycle electronics).
Engine Oil Change:
Every 3,000 km (2,000 miles) or 6 months.
Oil Filter Change:
Every 6,000 km (4,000 miles) or 12 months (concurrent with oil change).
Air Filter Cleaning:
Every 6,000 km (4,000 miles).
Spark Plug Replacement:
Every 12,000 km (7,500 miles).
Valve Clearance Check:
Every 12,000 km (7,500 miles).
Chain Lubrication Adjustment:
Every 1,000 km (600 miles) or more frequently in dusty/wet conditions.
Coolant Type:
Permanent type antifreeze coolant (ethylene glycol based) with demineralized water (50/50 mix).
Common Wear Items:
Clutch plates, chain and sprockets, brake pads, tires, fork seals, battery.
Potential Issues:
Carburetor synchronization can drift, leading to rough idling; valve adjustments are critical for smooth operation; chain maintenance is paramount for drivetrain longevity.
Kawasaki Legacy:
Kawasaki Heavy Industries, Ltd. has a long and distinguished history in motorcycle manufacturing, known for innovation and performance across various categories.
Ninja Lineage:
The Ninja 250 lineage began in the mid-1980s, evolving through various iterations. The EX250-J generation (2008-2012) represented a significant styling and chassis update, bringing it closer to its larger Ninja siblings.
Manufacturing Location:
Typically manufactured in Thailand for global markets.
