Segment:
Cruiser Motorcycle
Target Audience:
Beginner to intermediate riders, customizers, and those seeking a simple, reliable, and stylish cruiser.
Competitors:
Honda Shadow series, Yamaha V-Star series, Kawasaki Vulcan series, entry-level Harley-Davidson models.
Design Philosophy:
Classic styling, torquey single-cylinder engine, low seat height, user-friendly ergonomics.
Value Proposition:
Affordable entry into the cruiser market with Suzuki's renowned reliability and accessible maintenance.
Primary Coverage:
Comprehensive mechanical and electrical systems, maintenance, troubleshooting, and repair for the 2005-2009 Suzuki LS650 S40 Boulevard.
Body And Frame:
Covered: Body panels, frame, suspension components, wheels, tires, steering, braking systems, exhaust system.
Engine And Drivetrain:
Covered: Engine internal components, lubrication, cooling, fuel system, ignition system, exhaust, transmission, clutch, final drive.
Electrical System:
Covered: Battery, charging system, ignition system, lighting, instrumentation, starting system, wiring diagrams.
Estimated Pages:
Approx. 300-400 pages (typical for this type of comprehensive manual)
Type:
Factory Service Manual / Repair Manual
Engine Management:
Detailed coverage of fuel injection, ignition timing, idle control, and sensor operations.
Fuel System:
Includes fuel pump, injector servicing, fuel pressure testing, and evaporative emission control system.
Cooling System:
Radiator, fan, thermostat, water pump, and coolant specifications.
Lubrication System:
Oil pump, oil filter replacement, oil pressure testing, and oil specifications.
Transmission And Clutch:
Gearbox disassembly and assembly, clutch operation, adjustment, and fluid specifications.
Brakes:
Hydraulic system, disc brake servicing, pad replacement, fluid specifications, and bleeding procedures.
Suspension:
Front fork servicing, rear shock absorber replacement, and alignment checks.
Steering:
Handlebar assembly, steering head bearing service, and troubleshooting.
Electrical Diagnostics:
Detailed wiring diagrams for all electrical components, troubleshooting flowcharts, and component testing procedures.
Lighting And Indicators:
Headlight, taillight, turn signals, and brake light system servicing.
Instrumentation And Gauges:
Speedometer, tachometer, indicator lights, and their associated wiring.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, brake adjustments, spark plug replacement.
Component Overhaul:
Engine top-end and bottom-end rebuilds, carburetor/fuel injection system overhauls, transmission rebuilds.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon faults, including electrical issues.
Special Tools:
Identification and usage instructions for specialized tools required for specific repairs.
Torque Specifications:
Precise torque values for all critical fasteners.
Wiring Diagrams:
Comprehensive, detailed, and clearly labeled wiring schematics for all electrical systems.
Depth:
Full factory-level technical information, suitable for professional mechanics and experienced DIY enthusiasts. Covers everything from routine maintenance to complete engine and transmission overhauls.
Engine Type:
4-stroke, SOHC, 4-valve, V-twin
Displacement:
652 cc (39.8 cu. in.)
Bore X Stroke:
85.0 mm x 57.0 mm
Horsepower:
Approx. 40-45 HP (Varies slightly by year and specific tune)
Torque:
Approx. 39-42 lb-ft (Varies slightly by year and specific tune)
Fuel Delivery:
Fuel Injection (Suzuki's SDTV - Suzuki Dual Throttle Valve system)
Fuel Type:
Unleaded gasoline, 87 octane (or higher)
Ignition Type:
Digital electronic ignition
Oil Capacity With Filter Change:
3.1 L (3.3 US qt)
Recommended Oil Type:
SAE 10W-40 API SG, JASO MA certified motorcycle oil
First Scheduled Service:
600 miles (1,000 km) or 6 months, whichever comes first.
Subsequent Oil Change:
Every 3,700 miles (6,000 km) or 12 months.
Spark Plug Inspection:
Every 7,500 miles (12,000 km)
Valve Clearance Check:
Every 7,500 miles (12,000 km)
Drive Chain Inspection And Lubrication:
Every 600 miles (1,000 km) or after riding in wet conditions.
Transmission Oil Type:
SAE 80W API GL-4 (for transmission if separate from engine oil, but this is typically wet clutch and uses engine oil).
Carburetor Transition Challenges:
Early models with carburetors could experience occasional tuning issues or jetting problems, less so with the later FI models.
Idle Stability Fi:
Some FI models might require minor ECU recalibration or idle speed adjustments to maintain perfect idle stability in varying conditions.
Rear Drum Brake Performance:
The rear drum brake is adequate but not as powerful as a disc; regular adjustment and inspection are key.
Clutch Cable Adjustment:
Clutch cable play can loosen over time and requires periodic adjustment for proper engagement.
Manufacturer:
Suzuki Motor Corporation, Japan
Brand Focus:
Known for a broad range of motorcycles, ATVs, automobiles, and marine products, often emphasizing reliable engineering and innovative features.
Predecessor:
Intruder 650 (LS650P)
Rebranding:
Renamed from Intruder 650 to S40 Boulevard to align with Suzuki's 'Boulevard' line of cruisers.
Key Updates 05-09:
Transition from carburetor to fuel injection (major update for this period), minor styling adjustments, wheel design changes.
Original Production Start:
1985 (as LS650 Intruder)
Current Status:
Production continued beyond 2009, though specific model updates may have occurred.
Industry Awards:
While specific major awards for the S40 are not widely publicized, it consistently receives praise in reviews for its value, ease of use, and classic styling within its segment.
Review Consensus:
Praised for reliability, torquey engine character, and accessibility for new riders. Criticized by some for dated technology (especially pre-FI models) and less potent rear brake.
