What causes Carburetor gummed up from old fuel on the Yamaha Ttr125?

Cold start difficulty, rough idle, hesitation on throttle Estimated fix cost: $20-$60

What causes Worn cam chain causes rattling noise on the Yamaha Ttr125?

Rattling on startup, listen near top end Estimated fix cost: $80-$150

Hard starting, ticking noise, loss of compression Estimated fix cost: $50-$120

Oil residue on lower fork legs Estimated fix cost: $40-$100

Known issues to inspect before buying a used Yamaha Ttr125. What to check and how much repairs cost.

MINOR

Cold start difficulty, rough idle, hesitation on throttle

Fix cost: $20-$60

MODERATE

Rattling on startup, listen near top end

Fix cost: $80-$150

MODERATE

Hard starting, ticking noise, loss of compression

Fix cost: $50-$120

MINOR

Oil residue on lower fork legs

Fix cost: $40-$100

☐Cold start the bike before buying

☐Check compression with gauge ideally

☐Inspect frame for cracks or welds

☐Look for oil leaks around engine

Very reliable, simple engine, easy cheap maintenance