What causes Cam chain tensioner rattle on cold start on the Triumph T120?

Listen for ticking noise on cold startup immediately Estimated fix cost: $150-$400

What causes Throttle bodies require balancing and sync on the Triumph T120?

Rough idle or uneven power delivery between cylinders Estimated fix cost: $80-$150

Inspect lower fork legs for oil residue or staining Estimated fix cost: $150-$300

Check battery voltage at idle, should read 13.8-14.5v Estimated fix cost: $200-$450

Known issues to inspect before buying a used Triumph T120. What to check and how much repairs cost.

MODERATE

Listen for ticking noise on cold startup immediately

Fix cost: $150-$400

MINOR

Rough idle or uneven power delivery between cylinders

Fix cost: $80-$150

SERIOUS

Check battery voltage at idle, should read 13.8-14.5v

Fix cost: $200-$450

MODERATE

Inspect lower fork legs for oil residue or staining

Fix cost: $150-$300

☐Check service history, cam chain tensioner replaced

☐Test ride cold start, listen for mechanical noise

☐Inspect frame for crash damage or repairs

☐Verify charging system voltage with multimeter

Generally solid, maintenance matters above all