What causes Rear shock linkage bearings seize from neglect on the Kawasaki Ninja 650r (er-6f)?

Lift rear, flex swingarm for stiffness or grinding Estimated fix cost: $150-$400

What causes Cam chain tensioner rattle on early models on the Kawasaki Ninja 650r (er-6f)?

Cold start rattle from right side of engine Estimated fix cost: $200-$500

Battery voltage at 4000rpm, should read 13.5-14.5V Estimated fix cost: $250-$600

Neutral light accuracy, clutch grab during slow pulls Estimated fix cost: $100-$300

Known issues to inspect before buying a used Kawasaki Ninja 650r (er-6f). What to check and how much repairs cost.

MODERATE

Lift rear, flex swingarm for stiffness or grinding

Fix cost: $150-$400

MODERATE

Cold start rattle from right side of engine

Fix cost: $200-$500

MODERATE

Battery voltage at 4000rpm, should read 13.5-14.5V

Fix cost: $250-$600

MINOR

Neutral light accuracy, clutch grab during slow pulls

Fix cost: $100-$300

☐Check linkage bearings for stiffness or grinding

☐Cold start and listen for cam rattle

☐Measure charging voltage at higher rpm

☐Inspect frame welds, fairing tabs, crash damage

Very reliable if maintained; cheap simple parallel-twin