Segment:
Dual-sport/Adventure motorcycle
Target Audience:
Riders seeking a versatile motorcycle for on-road commuting and off-road exploration
Competitors:
BMW F650GS, Honda Transalp, Kawasaki KLR650, Suzuki V-Strom 650
Engine Type:
Liquid-cooled, SOHC, 4-valve, single-cylinder
Fueling:
Electronic fuel injection (EFI)
Suspension:
Long-travel telescopic front forks, Monocross rear suspension
Variants:
XT660R (Spoked wheels, more off-road oriented), XT660X (Alloy wheels, Supermoto style), XT660Z Ténéré (Larger fuel tank, wind protection, more adventure focus)
Engine Mechanical:
Engine teardown, assembly, cylinder head, valve train, pistons, crankshaft, lubrication system, cooling system
Fuel System:
Fuel injection system, throttle body, fuel pump, injectors, fuel pressure regulator, evaporative emission control system
Ignition System:
Ignition control unit (ECU), ignition coils, spark plugs, wiring diagrams
Transmission:
Clutch operation and service, gearbox components, shift mechanism, lubrication
Chassis Frame:
Frame inspection, steering head bearings, suspension component removal/installation
Front Suspension:
Front fork disassembly, assembly, oil change, seal replacement, damping adjustments
Rear Suspension:
Rear shock absorber service, linkage maintenance, swingarm removal/installation
Braking System:
Brake fluid change, caliper service, master cylinder overhaul, pad replacement, disc inspection
Wheel Tire:
Wheel bearing service, tire replacement, spoke tensioning (if applicable to variants)
Electrical System:
Battery service, charging system (stator, regulator/rectifier), starter motor, lighting (headlight, taillight, indicators), horn, instrumentation
Wiring Diagrams:
Complete electrical schematics for all systems
Bodywork Trim:
Fairing removal/installation, seat, fuel tank, fenders, graphics
Routine Maintenance:
Oil change, filter replacement, chain adjustment, spark plug replacement, air filter service, brake bleeding
Troubleshooting:
Diagnostic charts and procedures for common problems
Major Repairs:
Engine rebuild, transmission overhaul, suspension refurbishment
Component Disassembly Assembly:
Step-by-step instructions for virtually all components
Diagnostic Procedures:
Detailed procedures for identifying and resolving issues, including electronic diagnostics (if applicable)
Specifications Tolerances:
Precise torque values, clearances, measurements, and tolerances for all parts
Special Tools:
Identification of Yamaha-specific tools required for certain procedures
Engine Code:
10Y (or similar Yamaha internal code)
Bore X Stroke:
100 mm x 84 mm
Compression Ratio:
10.0:1
Valve Train:
Single Overhead Camshaft (SOHC), 4 valves per cylinder
Cooling System:
Liquid-cooled
Horsepower:
Approx. 47.3 HP @ 6000 RPM
Torque:
Approx. 60 Nm (44.3 lb-ft) @ 5250 RPM
Fuel Delivery:
Electronic Fuel Injection (EFI) with Mikuni throttle body
Fuel Type:
Unleaded gasoline, minimum 87 octane
Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher
Oil Capacity:
Approx. 2.4 L (2.5 US qt) with oil filter change
Overall Length:
Varies slightly by model variant (e.g., XT660R: ~2125 mm)
Overall Width:
Varies slightly by model variant (e.g., XT660R: ~830 mm)
Overall Height:
Varies slightly by model variant (e.g., XT660R: ~1180 mm)
Wheelbase:
Varies slightly by model variant (e.g., XT660R: ~1455 mm)
Ground Clearance:
Varies by model variant (e.g., XT660R: ~210 mm)
Dry Weight:
Varies by model variant (e.g., XT660R: ~165 kg / 364 lbs)
Wet Weight:
Approx. 174 kg / 384 lbs (XT660R, with fluids)
Fuel Capacity:
Approx. 15 L (3.96 US gal) for XT660R/X, 20 L (5.3 US gal) for XT660Z Ténéré
Crash Test Results:
Not applicable to motorcycles in the same way as cars; focus is on design and compliance with safety regulations.
Braking System:
Hydraulic disc brakes front and rear. ABS available on some variants/markets.
Lighting:
Halogen headlight, LED taillight/brake light, incandescent or LED turn signals
Frame Construction:
Steel diamond frame for rigidity and impact absorption
Ergonomics:
Designed for rider control and comfort during varied riding conditions
Instrumentation:
Digital LCD instrument cluster featuring speedometer, tachometer, fuel gauge, odometer, trip meters, clock, and indicator lights.
ABS Availability:
Available on certain model years and markets as an option.
ECU Diagnosis:
Diagnostic connectors for electronic fuel injection system tuning and fault diagnosis.
Oil Filter Change:
Every 6,000 km (3,700 mi) or 6 months
Air Filter Inspection:
Every 6,000 km (3,700 mi)
Spark Plug Replacement:
Every 12,000 km (7,500 mi)
Valve Clearance Check:
Every 24,000 km (15,000 mi)
Chain Lubrication Adjustment:
Every 1,000 km (600 mi) or after riding in the rain/dust
Engine Oil:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher
Coolant:
Permanent type antifreeze coolant (ethylene glycol-based), 50% solution with distilled water
Brake Fluid:
DOT 4 specification (refer to manual for specific Yamaha part number)
Transmission Oil:
Refer to manual; typically Yamalube Gear Oil (or equivalent) SAE 80 API GL-4 or GL-5
Common Wear Items:
Clutch plates, brake pads, chain and sprockets, fork seals, wheel bearings due to typical usage.
Potential Quirks:
Some owners report vibrations at certain RPMs, or a slightly abrupt throttle response from the EFI. Regular maintenance is key to longevity.
