High-spec QJMotor SRK 421 RR arrives as a Kawasaki ZX-4RR challenger
QJMotor has revealed the newest addition to its ever-growing 2026 line-up, which is a four-cylinder supersport with futuristic “Mecha” styling.
The Kawasaki ZX-4RR looks to have a new rival from China when it comes to the 400cc supersport segment, after QJMotor unveiled the new SRK 421 RR.
In the UK, QJMotor’s supersport range already featured the SRK 125 R, SRK 800 RR and SRK 921 RR. However, there was nothing separating the entry-level 125 machine from the considerably more powerful SRK 800 RR.
That all changes with the arrival of the new SRK 421 RR, which makes use of a four-cylinder engine that produces 76bhp at 14,000rpm and 28 Ib-ft of torque at 13,000rpm.
Those numbers are nearly identical to the Kawasaki ZX-4RR, which produces 76bhp at a slightly higher 14,500rpm. Torque is the same with 28 Ib-ft at 13,000rpm.
That being said, the new SRK 421 RR is cheaper by quite some way, with the bike priced at £5,299. On the other hand, the 2026 Kawasaki ZX-4RR costs £8,799.
The SRK 421 RR, according to QJMotor, “has been crafted by the designers of some of the most acclaimed motorcycles and features original mecha-inspired styling that creates a futuristic presence. Its aerodynamic bodywork includes bold lines, geometric cuts, and a hollowed tail section that channels airflow to reduce drag.
“High-end components are also used from famed Japanese companies, including FCC paper-based clutch plates, NTN bearings, RIK piston rings, and Daido crankshaft bearings”, says QJMotor.
The new model also features quite an aggressive front face, which is equipped with a Ram Air intake. It also features a steel-aluminium frame, fully adjustable upside-down telescopic forks and a rear multi-link shock absorber from Marzocchi.
Stopping power is provided by Brembo, with radial four-piston calipers acting on 300mm dual front discs. At the rear is a two-piston caliper that bites down on a 240mm single disc. The braking setup is supported by dual-channel ABS.
A seven-inch TFT display provides all the necessary information, including smartphone connectivity, and navigation mirroring. Riders can choose between Normal and Sport modes to alter the bike’s throttle response and the level of intervention from the Traction Control System (TCS) and ABS. Sport mode is designed for track use.
The SRK 421 RR is available in three colour options: Black, White or Red/Silver.
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After graduating with a sports journalism degree, Robert joined Crash.net to lead the WorldSBK coverage in 2021, while also providing MotoGP coverage. Fulfilling that role for over three years, Robert was able to put his knowledge about all things racing to the test.
