Category:
Lightweight Supermoto / Performance Sportbike
Competitors:
Ducati Monster 600, Honda XR650L, Suzuki DR650SE (in spirit, though SZR660 was more road-focused).
Design Philosophy:
Designed to blend sportbike handling with the torquey power of a larger single-cylinder engine, offering a unique riding experience.
Target Audience:
Riders seeking an agile, characterful motorcycle with accessible performance for both commuting and spirited riding.
Engine:
Complete disassembly, assembly, diagnosis, and repair of the 660cc single-cylinder engine.
Fuel System:
Carburetor (Mikuni BSR36) tuning, cleaning, rebuilding, and fuel pump operation.
Ignition System:
CDI ignition system, spark plug specifications, timing checks, and troubleshooting.
Cooling System:
Liquid cooling system, radiator, fan operation, coolant specifications, and bleeding procedures.
Transmission:
Five-speed gearbox, clutch operation, adjustment, replacement, and gear oil specifications.
Drivetrain:
Chain drive system, sprocket inspection, adjustment, and lubrication recommendations.
Suspension:
Front telescopic forks (inverted), rear monoshock, adjustment procedures, oil types, and seals.
Brakes:
Front and rear disc brake systems, caliper service, hydraulic fluid specifications, bleeding, and pad replacement.
Electrical System:
Wiring diagrams, lighting system, battery maintenance, charging system (stator/rectifier), fuses, and relays.
Chassis And Frame:
Frame inspection, steering head bearing service, and general chassis component checks.
Bodywork:
Fairing removal and installation, seat, fuel tank, and other body panel service.
Maintenance:
Routine inspections, lubrication, filter changes, fluid checks and changes, chain adjustment, brake checks.
Troubleshooting:
Diagnostic procedures for common starting, running, and electrical issues with symptom-based guides.
Repair:
Step-by-step instructions for component removal, disassembly, cleaning, inspection, repair, and reassembly.
Overhaul:
Complete engine rebuild procedures, including piston, ring, valve, and crankshaft service.
Adjustment:
Carburetor synchronization, throttle cable, clutch cable, and suspension adjustments.
Depth:
Comprehensive, suitable for professional mechanics and advanced DIY enthusiasts.
Engine Type:
Four-stroke, SOHC, liquid-cooled, single-cylinder
Bore X Stroke:
100.0 mm x 84.0 mm
Horsepower Est:
48-50 HP @ 6500 RPM (approximate, depending on market regulations)
Torque Est:
58 Nm (43 lb-ft) @ 5000 RPM (approximate)
Carburetor:
Mikuni BSR36 (single)
Fuel Capacity:
16 Liters (4.2 US gal)
Oil Type:
Yamalube 4 (or equivalent API SG or higher, SAE 10W-40, 20W-40, or 20W-50)
Oil Capacity:
2.6 Liters (with filter change)
Oil Change Interval:
Every 4,000 km (2,500 miles) or 6 months.
Air Filter Inspection:
Every 4,000 km (2,500 miles).
Spark Plug Replacement:
Every 10,000 km (6,000 miles).
Chain Adjustment:
Every 2,000 km (1,200 miles) or as needed.
Valve Clearance Check:
Every 20,000 km (12,000 miles).
Coolant Type:
High-quality ethylene glycol-based antifreeze coolant (50% solution with distilled water).
Brake Fluid Type:
DOT 4 Hydraulic Brake Fluid.
Fork Oil Type:
Yamaha Fork Oil 10W or equivalent.
Potential Wear Items:
Cam chain wear, carburetor jetting sensitivity, fork seal leaks, clutch wear are common for this age and type of bike.
Electrical Gremlins:
Age-related electrical connector corrosion or loosening can cause intermittent issues.
Yamaha Legacy:
Yamaha Motor Company is a globally recognized manufacturer of motorcycles, marine products, and other motorized equipment, known for innovation and performance.
Szr Lineage:
The SZR series, particularly the SZR660, was a niche offering from Yamaha, combining elements of sportbikes and supermotos, leveraging their established single-cylinder engine technology.
Production Period:
Mid-1990s (primarily 1992-1996 for the SZR660).
Manufacturing Location:
Japan