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Powered by a completely redesigned 449 cc liquid-cooled DOHC single-cylinder, four-stroke engine featuring advancements such as finger-follower valvetrain, aggressive cam profiles, larger intake/exhaust valves, downdraft-style intake, bridged-box piston, and a 44 mm throttle body Cycle Worldmxpmag.com.
Delivers ~52.6 hp at 9,480 rpm and 32.8 lb‑ft torque at 6,730 rpm according to dyno tests Cycle WorldDirt Rider.
The engine offers a lively, responsive powerband—especially strong above 9,400 rpm—delighting riders, despite being slightly down on raw horsepower compared to the 2018 model Motocross Action Magazine.
Introduced Kawasaki’s first-ever electric start in a motocross bike, using a compact Li-ion battery and centrifugal decompressor Motorcycle Newsmxpmag.com.
Featured a hydraulic clutch, improving durability and lever feel during intense riding Motorcycle Newsmxpmag.com.
Built on a lighter, slimmer aluminum perimeter frame that uses the engine as a stressed member for improved rigidity and sharper handling Motorcycle Newsmxpmag.com.
Equipped with Showa 49 mm inverted coil-spring forks with A‑Kit technology (featuring Kashima Coat and micro-dimpled surfaces) and fully adjustable damping—much improved over the previous air-fork system mxpmag.com+1.
Rear features a revised Uni‑Trak linkage with improved shock layout, dual compression adjustment, and optimized swingarm rigidity for better traction mxpmag.com+1.
Front stopping power comes from a large 270 mm petal disc; rear utilizes a 250 mm petal disc—both with improved master cylinders for more consistent, powerful braking mxpmag.comCycle News.
A smoother, lower bodywork layout—including a flattened fuel tank and seat—gives better rider movement and control Motorcycle Newsmxpmag.com.
Specs summary:
Dry Weight: ~232.4 lb (105.4 kg)
Wet Weight: ~242.4 lb (110 kg)
Fuel Capacity: 1.64 gal (~6.2 L)
Wheel Travel: Front 12.0″ / Rear 12.1″
Ground Clearance: 13.4″
Seat Height: 37.6″
Wheelbase: 58.5″
Advertised pricing excludes applicable taxes title and licensing and are subject to change without notice. Pricing may exclude any added parts, accessories or installation unless otherwise noted. Sale prices include all applicable offers. Not all options listed available on pre-owned models. Contact dealer for details.
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2019 Kawasaki KX450 Overview
Engine & Performance
Powered by a completely redesigned 449 cc liquid-cooled DOHC single-cylinder, four-stroke engine featuring advancements such as finger-follower valvetrain, aggressive cam profiles, larger intake/exhaust valves, downdraft-style intake, bridged-box piston, and a 44 mm throttle body Cycle Worldmxpmag.com.
Delivers ~52.6 hp at 9,480 rpm and 32.8 lb‑ft torque at 6,730 rpm according to dyno tests Cycle WorldDirt Rider.
The engine offers a lively, responsive powerband—especially strong above 9,400 rpm—delighting riders, despite being slightly down on raw horsepower compared to the 2018 model Motocross Action Magazine.
Starting & Clutch
Introduced Kawasaki’s first-ever electric start in a motocross bike, using a compact Li-ion battery and centrifugal decompressor Motorcycle Newsmxpmag.com.
Featured a hydraulic clutch, improving durability and lever feel during intense riding Motorcycle Newsmxpmag.com.
Chassis & Suspension
Built on a lighter, slimmer aluminum perimeter frame that uses the engine as a stressed member for improved rigidity and sharper handling Motorcycle Newsmxpmag.com.
Equipped with Showa 49 mm inverted coil-spring forks with A‑Kit technology (featuring Kashima Coat and micro-dimpled surfaces) and fully adjustable damping—much improved over the previous air-fork system mxpmag.com+1.
Rear features a revised Uni‑Trak linkage with improved shock layout, dual compression adjustment, and optimized swingarm rigidity for better traction mxpmag.com+1.
Brakes & Wheels
Front stopping power comes from a large 270 mm petal disc; rear utilizes a 250 mm petal disc—both with improved master cylinders for more consistent, powerful braking mxpmag.comCycle News.
Ergonomics & Dimensions
A smoother, lower bodywork layout—including a flattened fuel tank and seat—gives better rider movement and control Motorcycle Newsmxpmag.com.
Specs summary:
Dry Weight: ~232.4 lb (105.4 kg)
Wet Weight: ~242.4 lb (110 kg)
Fuel Capacity: 1.64 gal (~6.2 L)
Wheel Travel: Front 12.0″ / Rear 12.1″
Ground Clearance: 13.4″
Seat Height: 37.6″
Wheelbase: 58.5″