The Jawa 42 FJ 350 comes carrying an aggressive styling compared to the standard Jawa 42. It gets a tear-drop fuel tank that is prominent with the bold ‘Jawa’ lettering. The side panels and fenders have been carried over from the standard Jawa 42, but the seat design is new, and so is the handlebar position The ergonomics of this motorcycle have been revised for a slightly dedicated riding posture. The bike uses different alloy wheels with a machined finish. Moreover, there are upswept exhausts and an off-set fuel tank cap. Among the features, the motorcycle gets an LED headlamp, a semi-digital instrument console, dual-channel ABS, and an assist and slipper clutch.

The new Jawa 42 FJ 350 gets a longer wheelbase than the standard Jawa 42 measuring at 1,440 mm. The seat height of the retro-themed motorcycle measures at 790 mm, while the ground clearance is 178 mm. The bike weighs 184 kg (without fuel), which is 2 kg more than the standard Jawa 42.

The new Jawa 42 FJ 350 gets power from the bigger 334 cc liquid-cooled, single-cylinder engine as compared to the 293 cc power mill available on the standard Jawa 42. The new and bigger engine has been derived from the Yezdi Adventure and comes promising better cooling, improved NVH levels, and improved overall performance. This is the same engine that works in the updated Jawa 350. However, unlike the Jawa 350 which gets a low-compression setup, the Jawa 42 FJ 350 comes with a high-compression motor that churns out 28.7 bhp peak power and 29.6 Nm peak torque. It is paired with a six-speed gearbox and comes with an assist and slipper clutch.

The suspension setup of Jawa 42 FJ 350 comprises 41 mm telescopic front forks with 135 mm of travel and five-step adjustable twin shock absorbers at the rear with 100 mm of travel. Braking power for the motorcycle comes from a 320 mm front disc and a rear disc brake with dual-channel ABS that come as standard equipment. The Jawa 42 FJ 350 rides on 18-inch front and 17-inch rear alloy wheels wrapped with a wide 140-section rear tyre.