What causes Valve clearance tightens, causes hard starting on the Honda CRF 250?

Cold start difficulty, compression test, service history records Estimated fix cost: $150-$400

What causes Piston and rings wear from neglected oil changes on the Honda CRF 250?

Blowby smoke, low compression, rattling on startup Estimated fix cost: $300-$600

Weep hole dripping, coolant level drop, milky oil Estimated fix cost: $80-$200

Bent fins, coolant leaks, frame cracks near mounts Estimated fix cost: $100-$350

Known issues to inspect before buying a used Honda CRF 250. What to check and how much repairs cost.

SERIOUS

Cold start difficulty, compression test, service history records

Fix cost: $150-$400

SERIOUS

Blowby smoke, low compression, rattling on startup

Fix cost: $300-$600

MODERATE

Weep hole dripping, coolant level drop, milky oil

Fix cost: $80-$200

MODERATE

Bent fins, coolant leaks, frame cracks near mounts

Fix cost: $100-$350

☐Request full maintenance and oil change records

☐Do cold compression test, minimum 170 psi

☐Check for coolant in oil, inspect weep hole

☐Inspect subframe, radiators, and crash damage signs

Reliable if maintained, high-wear race engine otherwise