QJ Motor SRK421RR
The QJ Motor SRK421RR is a sportbike, produces 76 bhp and weighs 176 kg.
76 bhp
Potencia
28.8 ft-lb
Torsión
176 kg
Peso
Carenado
Cuerpo
🔧 Service Schedule & Parts
Affiliate · we may earn| Service item | Every | Typical cost | Parts |
|---|---|---|---|
| 🛢️ Engine oil + oil filter | 5,000 km / 3,000 mi or 12 mo | $40-70 | 🛢️ Buy → ⚙️ Buy → |
| 🌬️ Air filter | 12,000 km / 7,500 mi | — | 🌬️ Buy → |
| ⚡ Spark plugs | 10,000 km / 6,000 mi | — | ⚡ Buy → |
| 🔧 Valve clearance check | 12,000 km / 7,500 mi | $250-450 | |
| 🔗 Chain & sprockets | 20000-30000 km (replace) | $100-160 | 🔗 Buy → |
| 🛑 Brake pads | 15000-25000 km | $60-110 | 🛑 Buy → |
| 💧 Brake fluid | 24,000 km / 15,000 mi or 2 yr | — | |
| 🧊 Coolant | 24,000 km / 15,000 mi | — | |
| 🛞 Tires | 8000-12000 km | $220-350 | 🛞 Buy → |
| 🔩 Major service | 12,000 km / 7,500 mi | $300-500 |
Video Review
Lo que los compradores deben saber
Rev-Happy Inline-Four
The SRK421RR features a 421cc 16-valve liquid-cooled DOHC inline-four engine with a rev counter ending at 16,000rpm. The engine comes alive above 8000rpm, wailing from its airbox and gathering pace enthusiastically until it hits the rev limiter.
Massive Price Advantage
The SRK421RR is priced at £5,599, which is £3,314 less than the rival Kawasaki Ninja ZX-4RR at £8,913. This makes it easily the most affordable new-generation inline-four cylinder sportsbike available.
Brembo Brakes and Bosch TC
The bike is equipped with 300mm twin front discs and 4-piston Brembo radial calipers with ABS, plus Bosch-developed traction control. The combination gives the lightweight SRK an impressive amount of stopping power.
Top 10 Accessories
Curated picks for the QJ Motor SRK421RR — owned, ridden, recommended.
Problemas comunes
Look under engine for coolant residue or staining
Test smooth throttle roll-on from low RPM
Grab swingarm, feel for play or clunking movement
Check dash for warning lights during test ride
✅Lista de verificación previa a la compra
Decent budget sport bike, parts sourcing can be difficult
Full Specifications
More QJ Motor SRK421RR Guides
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View all QJ Motor models →Community Reviews
Discussion
Frequently Asked Questions
What are common problems with the QJ Motor SRK421RR? +
Coolant leak from water pump seal: Look under engine for coolant residue or staining (moderate) | Throttle-by-wire hesitation and jerky response: Test smooth throttle roll-on from low RPM (minor) | Rear suspension linkage bearing wear: Grab swingarm, feel for play or clunking movement (moderate)
What is the horsepower of the QJ Motor SRK421RR? +
The QJ Motor SRK421RR produces 76 bhp, with 28.8 ft-lb of torque.
Is the QJ Motor SRK421RR good for beginners? +
Not really — the QJ Motor SRK421RR is better for experienced riders.
Is the QJ Motor SRK421RR reliable? +
The QJ Motor SRK421RR has no widely-reported critical reliability issues. 4 minor issues are documented — see the Common Problems section above.
Is the QJ Motor SRK421RR good for daily use? +
Better as a weekend/track bike than a daily — it's a sportbike.
What is the seat height of the QJ Motor SRK421RR? +
The QJ Motor SRK421RR has a seat height of 808mm (31.8 in). Most riders 170 cm+ will sit comfortably flat-footed.
What gear should I buy for a QJ Motor SRK421RR? +
Motoryk has curated a Top 10 gear list specifically for the QJ Motor SRK421RR, covering engine oil, tires, chain, battery, and brake pads — see motoryk.com/bikes/qj-motor/srk421rr/top10. Each pick is matched to this bike's spec.
