Engine and Transmission
Displacement: 644cc
Type: air-cooled, dry-sump, single-cylinder four-stroke
Bore and Stroke: 100mm x 82mm
Compression Ratio: 8.3:1
Valve Train: SOHC; four-valve RFVC
Induction: Single 34mm constant-velocity carburetor
Ignition: Solid-state CD with electronic advance
Transmission: Five-speed
Final Drive: #520 O-ring - sealed chain; 15T/45T
Chassis and Dimensions
Suspension Front: 43mm air-adjustable leading-axle Showa cartridge fork with 16-position compression damping adjustability; 11.6 inches travel
Rear: Pro-Link Showa single shock with spring preload, 20-position compression and 20-position rebound damping adjustability; 11.0 inches travel
Brakes Front: Single disc with twin-piston caliper
Rear: Single disc
Tires Front: 3.00-21
Rear: 4.60-18
Wheelbase: 57.3 inches
Rake (Caster Angle): 27.0o
Trail: 102mm (4.0 inches)
Seat Height: 37.0 inches
Ground Clearance: 13.0 inches
Fuel Capacity: 2.8 gallons, including 0.6-gallon reserve
Curb Weight: 346 pounds
Engine/Drivetrain
Bulletproof 644cc SOHC four-stroke engine produces power and torque ideally suited for both on- and off-road riding.
Radial Four-Valve Combustion Chamber (RFVC) allows excellent combustion efficiency and high power output.
42.5mm constant-velocity (CV) carburetor offers crisp throttle response, excellent driveability and maximum power.
Reliable electric starter system allows easy push-button starting.
Gear-driven counterbalancer minimizes bothersome and tiring vibration.
Free-flowing, two-into-one exhaust system with quiet, USDA-qualified spark arrester/muffler.
Maintenance-free automatic cam chain tensioner and solid-state CD ignition with electronic advance keep you out of the shop and on the road.
Dry-sump engine maximizes power by minimizing crankshaft windage and engine temperature.
Durable five-speed transmission offers a gear for every on- or off-road situation.
Heavy-duty, multi-plate clutch.
Heavy-duty, low-maintenance #520 O-ring - sealed drive chain.
Chassis/Suspension
Semi-double-cradle steel frame is lightweight, strong and offers precise handling manners.
43mm XR™-spec Showa cartridge fork features 16-position compression damping adjustability and superb off-road performance.
Pro-Link® Rear Suspension (see Technology Section)
Lightweight, strong and durable aluminum box-section swingarm with quick-detach rear wheel.
Front and rear disc brakes offer superb stopping power.
Lightweight yet super-strong wheels.
Frame-mounted passenger footrests allow two-up riding capability.
Aggressive, dual-purpose front and rear tires offer excellent performance both on and off road.
18-inch rear wheel for greater tire selection.
Lightweight rims and hubs feature straight-pull spokes.
Additional Features
Honda Racing-inspired colors and graphics.
Combination headlight/number plate and dual airflow shrouds direct cool air to the engine.
Enduro-style headlight features high/low beams.
Motocross-style seat is comfortable and allows maximum rider movement.
Large, durable fenders keep debris off the rider.
Lightweight tubular engine guard.
Wide-section, folding, cleated footpegs are comfortable and self-cleaning.
High-output 12-volt electrical system.
Flex-mounted turn signals resist breakage.
Compact speedometer features tripmeter/odometer, a neutral light as well as high-beam, turn-signal and sidestand indicators.
Easy-to-use choke allows for simple cold-weather starts.
Push-to-cancel turn-signal switch.
High-quality controls include comfortable grips and brush guards.
Transferable one-year limited warranty; extended coverage available with a Honda Protection Plan 
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