Category:
Middleweight Naked/Sportbike
Segment:
All-arounder, commuting, sport-touring, light sport riding.
Competitors:
Yamaha FZ6, Kawasaki Z750, Honda CBF600, Triumph Street Triple.
Engine Layout:
Inline-4 cylinder, liquid-cooled.
Fuel Delivery:
Electronic Fuel Injection (EFI).
Chassis Type:
Steel twin-spar frame.
Styling:
Naked (GSF650) and Half-Fairing (GSF650S) variants available.
Ergonomics:
Comfortable, upright riding position suitable for various riding styles.
Engine Mechanical:
Complete overhaul, cylinder head, pistons, crankshaft, connecting rods, valve train, oil pump, lubrication system, timing chain.
Engine Electrical:
Ignition system, starting system, charging system, CDI unit, sensors (TPS, MAP, Crankshaft Position), EFI components.
Fuel System:
Fuel injection system (EFI), fuel pump, injectors, throttle body, fuel pressure regulator, fuel tank, fuel filter.
Transmission And Drivetrain:
Gearbox inspection and repair, clutch operation, gear shift mechanism, final drive (chain and sprockets).
Cooling System:
Radiator, cooling fan, coolant pump, thermostat, hoses, fluid capacities and specifications.
Exhaust System:
Muffler, exhaust pipes, catalytic converter (if applicable).
Suspension:
Front forks (telescopic, cartridge type), rear shock absorber (monoshock), linkage, adjustment procedures.
Steering:
Handlebar assembly, steering stem, headstock bearings, steering damper (if equipped).
Braking System:
Front and rear disc brakes, calipers, master cylinders, brake lines, fluid specifications, bleeding procedures, ABS (if equipped).
Wheels And Tires:
Wheel removal and installation, tire replacement, balancing, recommended tire pressures.
Electrical And Ignition:
Battery, lighting system (headlights, taillights, turn signals), instrumentation, horn, starter motor, charging system (alternator, regulator/rectifier).
Frame And Bodywork:
Frame inspection, fairing removal and installation, seat, fuel tank mounting, body panel repair and alignment.
Troubleshooting:
Diagnostic charts for common problems, symptom-based troubleshooting for engine, electrical, and chassis issues.
Preventive Maintenance:
Oil changes, filter replacements, spark plug service, chain lubrication and adjustment, brake pad inspection, coolant flush, air filter cleaning/replacement.
Engine Repair:
Complete engine disassembly, reassembly, component inspection, piston ring replacement, cylinder head gasket replacement, timing chain replacement.
Fuel System Diagnosis:
Troubleshooting EFI system faults, injector testing, throttle body cleaning, fuel pump pressure testing.
Suspension Adjustment:
Front fork oil level and viscosity changes, rear shock preload and damping adjustments.
Brake System Maintenance:
Brake pad replacement, caliper service, master cylinder overhaul, brake fluid flush and bleeding.
Electrical Troubleshooting:
Wiring diagram interpretation, testing of electrical components, fault finding for starting, charging, and lighting issues.
Clutch Service:
Clutch lever adjustment, clutch plate inspection and replacement (if necessary).
Wheel Bearing Replacement:
Procedure for removing and replacing wheel bearings.
Carburetor Synchronization:
Not applicable for this fuel-injected model.
Depth:
Comprehensive (from basic maintenance to complete engine and electrical system overhauls).
Engine Type:
4-stroke, liquid-cooled, DOHC, inline four.
Bore X Stroke:
72.0 mm x 41.5 mm
Compression Ratio:
11.5:1
Valve Train:
DOHC, 4 valves per cylinder.
Ignition System:
Electronic Ignition (CDI).
Horsepower:
~85.1 HP @ 10000 rpm (approximate, depending on market/tuning)
Torque:
~62 Nm @ 7500 rpm (approximate, depending on market/tuning)
Fuel Delivery:
Electronic Fuel Injection (EFI) with dual throttle valves.
Fuel Tank Capacity:
20 Liters (5.3 US gal)
Fuel Type:
Unleaded gasoline, minimum 91 octane (RON+MON)/2.
Oil Type:
API SG, SF, SH, SJ, SL or higher, JASO MA certified motorcycle oil.
Oil Capacity W Filter:
3.4 Liters (3.6 US qt)
Coolant Type:
Ethylene glycol based coolant (50% coolant, 50% distilled water).
Oil Change Interval:
Every 6,000 km (3,700 miles) or 6 months, whichever comes first.
Oil Filter Change Interval:
Every 12,000 km (7,500 miles) or 12 months, replace at every oil change for best practice.
Spark Plug Service Interval:
Every 12,000 km (7,500 miles).
Air Filter Service Interval:
Every 6,000 km (3,700 miles), clean or replace as needed.
Chain Lubrication Adjustment:
Every 1,000 km (600 miles) or after washing/riding in rain.
Coolant Flush Interval:
Every 24,000 km (15,000 miles) or 24 months.
Engine Oil Grade And Spec:
10W-40, API SG or higher, JASO MA
Coolant:
50% Ethylene Glycol and 50% Distilled Water
Fork Oil Type:
According to manual specification, typically SAE 10W
Common Complaints:
Stalling at low RPMs (often related to EFI mapping or vacuum leaks), occasional clutch judder, rear shock absorber wear over time.
Typical Repairs:
Throttle body synchronization, cleaning injectors, checking for vacuum leaks, fork seal replacement, rear shock replacement.