What causes Power valve seizure from neglected maintenance on the Gas Gas Ec 300?

Remove and inspect PV for carbon buildup and movement Estimated fix cost: $150-$400

What causes Crankshaft bearing wear from low hours abuse on the Gas Gas Ec 300?

Check for crank wobble and listen for rod knock Estimated fix cost: $300-$600

Inspect weep hole under pump for coolant residue Estimated fix cost: $50-$150

Remove airbox and visually inspect reed petals for damage Estimated fix cost: $40-$80

Known issues to inspect before buying a used Gas Gas Ec 300. What to check and how much repairs cost.

SERIOUS

Remove and inspect PV for carbon buildup and movement

Fix cost: $150-$400

SERIOUS

Check for crank wobble and listen for rod knock

Fix cost: $300-$600

MODERATE

Inspect weep hole under pump for coolant residue

Fix cost: $50-$150

MINOR

Remove airbox and visually inspect reed petals for damage

Fix cost: $40-$80

☐Pull powervalve and check for carbon seizure

☐Compression test minimum 170psi acceptable

☐Check coolant color for milky oil contamination

☐Inspect frame for cracks near steering head

Strong engine, maintenance-dependent, inspect thoroughly before buying