What causes Coolant leak from water pump seal on the QJ Motor SRK421RR?

Look under engine for coolant residue or staining Estimated fix cost: $80-$150

What causes Throttle-by-wire hesitation and jerky response on the QJ Motor SRK421RR?

Test smooth throttle roll-on from low RPM Estimated fix cost: $0-$50

Grab swingarm, feel for play or clunking movement Estimated fix cost: $100-$200

Check dash for warning lights during test ride Estimated fix cost: $50-$120

Known issues to inspect before buying a used QJ Motor SRK421RR. What to check and how much repairs cost.

MODERATE

Look under engine for coolant residue or staining

Fix cost: $80-$150

MINOR

Test smooth throttle roll-on from low RPM

Fix cost: $0-$50

MODERATE

Grab swingarm, feel for play or clunking movement

Fix cost: $100-$200

MODERATE

Check dash for warning lights during test ride

Fix cost: $50-$120

☐Inspect frame welds for cracks or repairs

☐Verify service history and oil change records

☐Test all electronics, ABS, and traction control

☐Check tire date codes and brake pad thickness

Decent budget sport bike, parts sourcing can be difficult