The newly released QJ Motor SRK 421 RR (sometimes referred to as the SRK 450 RR in specific markets) has officially entered the ring to challenge the Kawasaki Ninja ZX-4RR for 400cc inline-four supremacy. This high-revving "screamer" features a 421cc, 16-valve DOHC engine that produces a claimed 76.4 hp (77.6 PS) at 14,000 rpm, virtually mirroring the performance of its Japanese rival while offering slightly more torque 39 Nm thanks to its extra displacement. Beyond the engine, the bike is a spec-sheet powerhouse, boasting premium hardware including fully adjustable Marzocchi suspension, Brembo radial brakes, and a comprehensive electronics suite featuring a 7-inch TFT display, cornering ABS, and a bi-directional quickshifter. Wrapped in "Mecha-inspired" aerodynamic bodywork with functional winglets and a hollowed tail section, the SRK 421 RR positions itself as a disruptive, high-value alternative that undercuts the competition's price tag without sacrificing track-ready components.
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Brand |
QJ Motor |
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Model |
SRK 421 RR 2026 |
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Status |
Available |
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Release Date |
2026 |
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Type |
Motorcycle |
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Tech Specs |
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Engine |
Inline four-cylinder, 16v, liquid-cooled, 4-stroke DOHC |
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Displacement |
421cc |
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Bore x stroke |
57mm x 41.2mm |
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Maximum power |
57kW (77.6ps) @ 14,000rpm |
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Maximum torque |
39.0 Nm @ 13,000rpm |
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Transmission system |
6 speed, chain final drive |
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Front suspension system |
Marzocchi upside-down (USD) telescopic forks, fully adjustable |
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Rear suspension system |
Marzocchi Multi-link mono-shock, fully adjustable |
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Front Brake |
Dual 300mm discs, Brembo 4-piston calipers, ABS |
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Rear Brake |
Single 240mm disc, Brembo 1-piston caliper, ABS |
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Front Tire |
120/70 ZR17 CST High-Performance Sport |
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Rear Tire |
160/60 ZR17 CST High-Performance Sport |
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L x W x H |
2020mm x 720mm x 1130mm |
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Seat Height |
808mm |
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Wheelbase |
1375mm |
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Fuel Capacity |
16L |
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Ground Clearance |
150mm |
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