ENGINE
Slim, compact, 689 cc, DOHC, 4-valve, liquid-cooled, 20-degree inclined, inline twin-cylinder engine.
The engine has been tuned to provide plenty of low & mid-range torque with very linear throttle response. This engine produces approximately 75 hp & 50 ft-lbs. of torque and is designed to maximize riding fun in the real world.
4-valve, downdraft-style combustion chamber with 11.5:1 compression ratio.
- excellent torque output in the low-to-mid rpm range
- 4-valve design maximizes flow into & out of combustion chamber
- 31.5 mm intake & 26.5 mm exhaust valves
- stainless steel valves feature an Isonite surface treatment & carburized tips for excellent durability & wear resistance
42,000 km-valve adjustment intervals.
Lightweight hollow camshafts.
- cam profiles & timing accentuate the low-to-mid-range torque & power in the most commonly used rpm range (3,000 to 6,500 rpm).
- excellent rideability with linear throttle response
CP3 "CrossPlane Concept" 270-degree crankshaft with an uneven firing order.
- design reduces inertia torque while emphasizing linear torque
- design has been optimized to achieve strong torque over a broad rpm range
Lightweight, gear-driven "coupling force balancer" reduces engine vibration for excellent comfort.
Fracture split connecting rods feature a "nutless" design.
- lower end "cap" of the rod is made from the same piece of material as the upper portion; the 2 pieces are "split" apart using a special fracturing process & then precision machined
- design aids in establishing true big end roundness & greater precision in con rod dimensions for excellent durability despite the horsepower loads
Lightweight, forged, aluminum short skirt pistons.
- lightweight design aids in fast engine response
- reduces mechanical vibration for excellent durability
Direct ceramic composite plated cylinder uses "liner less" bores.
- ceramic coating is sprayed directly on the aluminum block, eliminating the liner & reducing weight
- excellent heat dissipation for consistent power delivery
- coating enhances the thin film of oil between the cylinder & piston, reducing friction & increasing power
Offset cylinder design.
- cylinder is "offset" relative to the crank (toward exhaust side)
- reduces frictional losses between the pistons & cylinder wall during the power stroke for improved power output & excellent fuel economy
One-piece cylinder & upper crankcase assembly.
- superior engine & chassis rigidity (engine is a stressed member increasing chassis rigidity)
- design reduces weight
"Closed-loop" 38 mm Mikuni throttle body fuel injection system.
- system uses throttle position sensor (TPS) & idle speed controller (ISC)
- 12-hole injectors for optimum fuel atomization
- system is "tuned" to provide excellent rideability & linear throttle control.
- closed-loop system" uses an oxygen sensor to "sniff" spent exhaust & automatically adjust the fuel / air ratio for reduced emissions
Compact Electronic Control Unit (ECU).
- utilizes a powerful 32-bit processor for fast control of the injection & ignition processes
Airbox design features dual intakes.
- design reduces intake noise
- viscous paper type air filter is utilized
Compact, 6-speed transmission.
- Tri-axis design "stacks" input/output shafts to centralize mass
- overall engine size is shorter front to back allowing the engineers the freedom to place the engine in the frame for optimum front to rear weight balance
- transmission ratios are designed to suit the character (torque & power) of the engine
- specially chosen gear ratios means fewer gear changes
- 6th gear is an over drive gear reducing engine rpms at highway speeds for a comfortable ride
Compact, clutch design with light clutch lever pull.
Lightweight, vertical flow flat radiator with ring type cooling fan.
- ring type cooling fan pulls more air than a conventional non-ring type design
- left & right rad covers add a stylish highlight
Liquid-cooled oil cooler.
- maintains consistent lubricant temperatures for extended engine life
Convenient spin-on type oil filter & easy access drain plug.
- for fast, easy oil changes
Convenient oil level sight glass.
Maintenance-free transistor controlled ignition (TCI).
- produces a strong spark for fast starts
- provides precise ignition timing / mapping for optimum engine performance at all rpms
High performance direct ignition coils (ignition coils are built into the spark plug caps).
- reduces weight & complexity
AC Magneto produces 410 watts of power @ 5,000rpm.
Stylish, compact, low mounted, 2 into 1 exhaust system.
- triple expansion muffler design with 3-way honeycomb catalyzer reduces exhaust emissions
- low mounted design centralizes mass for excellent handling & a light weight feeling
Air Injection System (AIS... not ram air) injects fresh air into exhaust ports to fully burn any unburnt fuel, further reducing exhaust emissions.