Motorcycle Segment:
Sportbike / Naked Sportbike
Target Audience:
Performance-oriented motorcycle enthusiasts, customizers, and mechanics.
Key Competitors Era:
Ducati Monster, Triumph Speed Triple, Yamaha V-Max, Moto Guzzi V11 Sport.
Unique Selling Proposition:
Unique Buell chassis design, Harley-Davidson V-twin engine torque, minimalist sport styling.
Design Philosophy:
Emphasis on torque, handling, and a distinctive American sportbike character.
Engine System:
Complete disassembly, assembly, inspection, and repair of the Buell/Harley-Davidson V-twin engine.
Fuel System:
Carburetor (Mikuni BST40) tuning, cleaning, and overhaul; fuel tank and lines inspection and maintenance.
Ignition System:
Ignition module, coil, spark plug diagnosis and replacement, timing specifications.
Transmission System:
Clutch operation and adjustment, gearbox inspection and repair, primary drive maintenance.
Chassis Frame:
Frame inspection for damage, steering head bearing maintenance and adjustment.
Suspension System:
Front fork disassembly, seal replacement, oil specifications, and adjustments; rear shock absorber inspection and service.
Braking System:
Front and rear brake caliper service, hydraulic system bleeding, pad replacement, rotor inspection.
Electrical System:
Wiring diagrams, component testing (starter, alternator, battery, lighting), troubleshooting electrical faults.
Exhaust System:
Exhaust pipe and muffler inspection and replacement.
Cooling System:
Oil cooling system components, oil filter replacement, oil type and capacity.
Routine Maintenance:
Oil and filter changes, spark plug replacement, chain adjustment, brake pad checks, air filter service.
Engine Repair:
Top-end rebuild (cylinder head, valves), bottom-end rebuild (crankshaft, connecting rods), piston and ring replacement.
Transmission Repair:
Gearbox rebuild, clutch plate replacement, primary drive sprocket and chain inspection.
Suspension Service:
Front fork seal replacement, rear shock absorber servicing (where applicable).
Brake Service:
Brake fluid flush and replacement, caliper seal replacement, master cylinder service.
Electrical Troubleshooting:
Diagnosis of starting issues, charging system problems, lighting failures using wiring diagrams.
Carburetor Overhaul:
Detailed steps for carburetor cleaning, jetting adjustments, and float bowl setting.
Wheel And Tire:
Wheel bearing replacement, tire mounting and balancing, spoke tensioning (if applicable to specific wheels).
Bodywork Repair:
Fairing removal, installation, and minor repair; seat removal and installation.
Diagnostic Capability:
Advanced diagnostic procedures for engine performance, electrical systems, and mechanical components.
Rebuild Scope:
Comprehensive instructions for complete engine and transmission rebuilds.
Specifications Detail:
Detailed torque specifications, clearances, tolerances, and fluid capacities for all major components.
Diagrams Quality:
Includes detailed exploded views, wiring diagrams, and schematic illustrations.
Engine Type:
Air-cooled, 45-degree V-twin, Four-stroke
Displacement:
1203 cc (73.4 cu in)
Bore X Stroke:
3.49 in x 4.12 in (88.9 mm x 104.7 mm) - Typical for Harley-Davidson Sportster derivatives
Compression Ratio:
Approximately 9.2:1 (typical for this engine configuration)
Valvetrain:
OHV, 2 valves per cylinder, pushrod actuated
Cylinder Material:
Cast Iron (Liner)
Cylinder Head Material:
Aluminum Alloy
Horsepower:
Approx. 90-95 HP @ 6000 RPM (Manufacturer claims varied, performance was rider-centric)
Torque:
Approx. 75-80 ft-lbs @ 4500 RPM (Emphasis on low-end torque)
Carburetor:
Mikuni BST40 (Flat Slide) with Throttle Position Sensor (TPS) for ECM input.
Fuel Type:
Unleaded Gasoline, 87-91 Octane
Fuel Tank Capacity:
Approx. 3.5 US gallons (13.2 liters)
Fuel Delivery:
Gravity Feed with Electric Fuel Pump (for initial prime)
Ignition Type:
Electronic Ignition (ECM controlled)
Spark Plugs:
NGK DPR8EIX-9 (Iridium) or equivalent
Cooling Method:
Air-cooled, with Oil Cooler
Oil Type:
SAE 20W-50 Motorcycle Oil (API SG or higher, JASO MA)
Oil Capacity With Filter:
Approx. 3.0 US quarts (2.8 liters)
Oil Filter Part Number:
Buell/Harley-Davidson P/N 63796-77A or aftermarket equivalent (e.g., Fram PH6017A)
Length:
Approx. 83.2 inches (2113 mm)
Width:
Approx. 31.1 inches (790 mm)
Height:
Approx. 45.3 inches (1151 mm)
Wheelbase:
Approx. 57.3 inches (1455 mm)
Ground Clearance:
Approx. 5.0 inches (127 mm)
Dry Weight:
Approx. 410 lbs (186 kg)
Wet Weight:
Approx. 440 lbs (200 kg)
Front Tire Size:
120/70ZR-17
Rear Tire Size:
170/60ZR-17
Front Wheel Type:
Cast Aluminum (3.50 x 17)
Rear Wheel Type:
Cast Aluminum (5.00 x 17)
Bolt Pattern:
N/A (Specific to motorcycle hub)
Crash Test Ratings:
N/A (Motorcycles typically do not undergo formal crash testing like cars)
Braking System:
Dual Disc Front (2-piston caliper), Single Disc Rear (2-piston caliper)
Brake Discs Front:
Two 292mm (11.5 inch) discs
Brake Discs Rear:
One 270mm (10.6 inch) disc
Suspension Tuning:
Adjustable front forks (preload/rebound) and rear shock (preload/rebound) for tailored handling.
Frame Design:
Buell's patented 'Truss Frame' design with integrated oil containment, offering rigidity and mass centralization.
Lighting:
Halogen Headlight, LED Taillight/Brake Light
First Service:
500 miles (800 km) - Oil/filter change, chain adjustment, general inspection.
Regular Oil Change:
Every 2,500 miles (4,000 km) or annually.
Air Filter Service:
Every 5,000 miles (8,000 km) or as needed based on riding conditions.
Spark Plug Replacement:
Every 7,500 miles (12,000 km).
Brake Fluid Flush:
Every 12,000 miles (20,000 km) or every two years.
Engine Oil Viscosity:
SAE 20W-50
Transmission Oil Viscosity:
SAE 80W-90 Gear Oil
Brake Fluid Type:
DOT 4 Hydraulic Brake Fluid
Fork Oil Type:
Bel-Ray 7W or equivalent (consult manual for specific weight recommendation)
Carburetor Tuning:
Mikuni BST40 can be sensitive to altitude and require re-jetting; idle stability issues.
Belt Drive Maintenance:
Proper tensioning is crucial to prevent premature wear; regular inspection for damage.
Electrical Connections:
Corrosion and loose connections can lead to intermittent electrical faults; requires diligent inspection.
Vibration:
Characteristic of the V-twin engine, can lead to fastener loosening if not properly torqued.
Clutch Cable:
Regular adjustment and lubrication of the clutch cable is recommended.