Page 186 of Kawasaki Motorcycles by Kawasaki USA

Billet camshafts are carburized for durability and operate alloy tool steel tappets. Automatic centrifugal decompression system fitted to exhaust cam lifts one exhaust valve to ease starting. The systems simple construction ensures light weight and high reliability. An optional cable set-up allows manual operation of the decompressor (via a lever on the right handle grip) making it even easier to clear a flooded engine. Stiffer valve springs help ensure reliable valve control at high-rpm. Lightweight, high-performance titanium valves ensure accurate valve timing even at maximum engine speed. New cam timing helped increase high-rpm performance without sacrificing the low end. To make starting easier, we recalibrated lift and timing of the decompression system. 37 mm Keihin FCR flat-slide carburetor is equipped with a Throttle Position Sensor (TPS) and an accelerator pump for quick throttle response. The KX250F 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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