Common Problems with the Bonneville T100 (LC 2016+)

The Triumph Bonneville T100 Liquid Cooled 2016 and onwards models are very reliable, however when it comes to Triumph Bonneville T100 problems, there are a few small things to be aware of, especially if you are buying a used motorcycle with no warranty or a part-service history. 

Triumph_Bonneville_T100_Black

Charging System Issues

What to look for: Battery dying quickly, dim lights, or electrical flickering.
Cause: Faulty regulator/weak stator/dead battery.
Fix: Upgrade to a more robust regulator or relocate for better cooling airflow. Test the battery and replace if required.

Coolant Leaks

What to look for: White residue or coolant smell, especially near hoses or water pump.
Cause: Loose or degraded hose clamps, or early water pump weep.
Fix: Tighten clamps or replace suspect hoses; water pump leaks may require a seal replacement.

Throttle Hesitation / Snatchy Low-Speed Response

What to look for: Jerky behaviour at low RPMs or during roll-on acceleration.
Cause: Factory lean fuel delivery for emissions.
Fix: Booster plug, Power Commander, or ECU remap greatly improves rideability.

Triumph_T100_Side_Shot

Soft Suspension

What to look for: Excessive front dive under braking or rear wallowing.
Cause: Budget suspension from the factory.
Fix: Upgrade front springs and rear shocks (e.g. Progressive, YSS, Öhlins).

Rust on Exhaust & Fasteners

What to look for: Surface rust, especially on downpipes and bracket bolts.
Cause: Thin chrome and exposure to elements.
Fix: Regular cleaning/protection or swap to stainless/aftermarket exhaust.

Premature Chain and Sprocket Wear

What to look for: Chain slack, rough acceleration, noise.
Cause: Irregular maintenance.
Fix: Clean, lube regularly; replace chain & sprockets as needed.

Triumph_Bonneville_T100_Gear_Case

Paint/Finish Wear

What to look for: Fading or peeling on engine casings, frame, or tank.
Cause: Road salt or sun exposure.
Fix: Use protectants and store under cover; touch up if needed.

Things to Check When Buying Used Triumph Bonneville T100 / T120

  • Full service history? Oil every 5–6k mi, valve checks at 12k mi.
  • Check coolant level & for leaks – behind radiator and pump area.
  • Inspect suspension for sag or weeping seals.
  • Inspect chain and sprockets for condition & stretch.
  • Tires and brake pads – Tread depth, cracks, pad depth.
  • Electrical gremlins? Test all lights, indicators, and horn.
  • Listen for clunky gearbox or noisy valve train.

 PLEASE NOTE: The information in this article is to be used as a guide only. If you are not a qualified mechanic, please instruct a professional to carry out an inspection to identify Triumph Bonneville T100 problems on your behalf.

 

Back to blog