Page 171 of Kawasaki Motorcycles by Kawasaki USA

Digital, multi-map, AC-Capacitor Discharge Ignition uses the TPS signal and a 3Dignition map to provide ideal ignition timing for various engine conditions. During acceleration and deceleration, the system makes adjustments to the 3D-ignition map, resulting in improved acceleration performance and smooth engine braking. Accelerator Compensator circuit monitors changes in rpm and adjusts the ignition timing to prevent wheel spin and improve traction. Lost spark control smooths the over-rev power by precisely cutting spark as the engine nears redline. Unlike conmventional systems, the KX450F spark gradually tapers off beginning approximately 1000 rpm before the rev limiter is reached so that power does not abruptly cut-out when the rev limiter is activated. The multi-map ignition system features separate ignition maps for in gear operation and in neutral. In gear, the ignition timing raises idle speed in order to minimize the 4-stroke engine braking effect that can upset handling when entering corners. A neutral sensor engages a different timing map that reduces idle speed to a normal level which works in conjunction with the hot start lever to provide quick starting. Phase-sensitive stator coil helps prevent kick-back during starting. Keihin FCR 40 mm flat-slide carburetor is equipped with a Throttle Position Sensor (TPS) and an accelerator pump for quick throttle response. The KX450F is equipped with a hot start lever on the handlebar for easy starting when the engine is hot. When the hot start lever is pulled, a small plunger at the front of the carburetor opens a passage that draws additional clean, unmixed air into the intake tract. The extra air leans out the fuel mixture to make starting a hot engine easier. Hot Start Plunger in Carb Body Hot Start Lever on Clutch Perch

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