2025 KLX®140R F — Full‑size confidence for trail riders

Overview

The 2025 KLX®140R F brings approachable performance to a full‑size off‑road platform, giving newer and returning riders the stability of 21/18-inch wheels with the easy manners the KLX trail family is known for. It combines a friendly power delivery, push‑button starting, and durable components in a lightweight package that’s ready for weekend singletrack, camp riding, and skill building.

Engine and performance

At the core is a 144cc air‑cooled four‑stroke single engineered for smooth, tractable power. The electric start gets you moving quickly, while a 5‑speed manual transmission and a light, predictable clutch make it simple to find the right gear and build confidence on varied terrain. Power comes on cleanly to help riders focus on line choice and technique rather than throttle management.

Chassis, suspension, and brakes

A high‑tensile steel perimeter frame provides a stable, planted feel without excess weight. Long‑travel suspension soaks up rocks, roots, and whoops, with a telescopic front fork and Uni‑Trak® rear linkage tuned for trail comfort and control. Front and rear disc brakes deliver consistent stopping power and modulation in dirt, mud, or loose gravel.

Ergonomics and wheels

The “F” model’s full‑size 21-inch front and 18-inch rear wheels roll over obstacles more easily and offer broad tire choices as skills progress. KX™‑inspired bodywork gives a slim mid‑section and straightforward rider triangle, helping a wide range of teens and adults move around the bike and stay in control. Grippy contact points and intuitive controls round out a cockpit that feels natural from the first ride.

In the KLX lineup

Within the KLX®140R family, the KLX®140R offers the lowest seat height, the KLX®140R L adds a taller mid‑size wheelset, and the KLX®140R F provides the full‑size 21/18-inch setup for maximum stability and obstacle clearance. Choose the model that best matches rider size and terrain.