Features and Benefits
Ultra-powerful 449cc Liquid-cooled, Four-stroke Single
449cc liquid-cooled, four-stroke single with four valves
Features improved low and mid-range power delivery for climbing hills, riding in the mud or other poor-traction, low-speed conditions
Linear power curve offers plenty of over-rev, for maximum flexibility in choosing shift points
Top End
Revised cam lift and timing boost low- and mid-range torque
Camshaft lobes and tappets feature a soft-nitride surface treatment for long wear and high-rpm reliability
Hand-finished surfaces of the polished intake ports improve intake efficiency at all rpm
Lightweight 36mm titanium intake valves and aluminum valve retainers reduce reciprocating weight for reliable valve control at high rpm
30mm steel exhaust valves replace the KX's 31mm titanium units for improved durability
Double valve springs help ensure stable valve operation
Screw-type automatic cam chain tensioner with oil pressure spring
Revised ignition timing helps boost power
Low-friction coating on piston skirt
Bottom End
Flywheel mass is double that of the KX450F to provide ultra-smooth engine power characteristics
Crankshaft, rotor mass centralization, oil circulation, and ignition timing have been carefully examined to help ensure ideal engine braking characteristics
Crankshaft and connecting rod are sintered for additional rigidity
Exhaust
Large 41mm titanium exhaust header for maximum power
Tapered exhaust pipe joint helps increase ultra-low rpm power.
Titanium exhaust pipe heat shield
Silencer uses long-fiber packing for lower maintenance
Cooling
High-capacity Denso radiators deliver superior cooling efficiency
A reservoir tank is fitted to the radiator, for efficient cooling during long enduros
Slim radiators feature tightly packed cores and fins designed to enhanced heat dispersion
The KLX radiator shroud design is optimised for a seated position, compared to the KX shrouds