2002 KX125 key features and changes

Engine: Reshaped combustion chamber for increased compression; Reshaped exhaust and scavenging ports, and revised exhaust timing for better power at high rpm; Piston tin-plated and " machine-streaked " to prevent scarring, especially during running in; New, lighter crankshaft for quicker engine response; Revised ignition timing for more power at mid to high rpm; Optional flywheel weight for more customer choice.

Electrofusion cylinder: Improves heat transfer for consistent power output; It’s porous so it holds lubrication well; It’s hard so it resists abrasion and seizure; Improved honing method allows more precise piston-to-cylinder clearances for more horsepower.

KIPS powervalve: Revised governor bearings and springs stabilize operation and open quicker; New, two-piece power valve improves low-end torque and seals better at high rpm.

Mikuni TMX38 carburettor: New carb significantly boosts top-end power; Positions needle closer to intake tract

Rear suspension: Cast aluminium section of the swingarm is designed for less weight and more rigidity; The shock features both low and high-speed compression damping adjustments; Single-rate shock spring and matching damping settings.

Front suspension: 48mm USD forks; Bladder system helps control bottoming and smoothes out jolts; Increased rigidity and reduced weight; Straight-rate springs; Polished internal surfaces for smooth action; Upper triple-clamp now features KX250-style bolt-on handlebar mounts with rubber dampers, which can be rotated to change handlebar position.

Brakes: Front brake caliper’s twin pistons made from aluminium to reduce weight

New push rods in rear brake master cylinder improves pedal position

Steel perimeter frame: Compact and quick handling; Removable aluminium rear sub-frame for easy access to the rear shock ; New footpegs designed to reduce mud build up

Details: U-shaped rims have no shoulder to prevent mud build-up in wet conditions; New thicker graphics; Thicker, reshaped seat designed to be more durable and increase airflow into the airbox; Fuel tank is flatter and incorporates new square inset nuts to more securely mount the shrouds and seat base; Optional 20-inch rim or wheel assemblies available

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MCN Staff

By MCN Staff