Triumph Bonneville Service Schedule: Guide for Water-Cooled T100 & T120 Models

If you're the proud owner of a Triumph Bonneville T100 / T120, keeping your bike running smoothly starts with staying on top of its maintenance. Whether you’re riding daily or hitting the backroads on weekends, following the Triumph Bonneville service schedule is essential to preserve performance, safety, and reliability—especially for the later water-cooled models introduced from 2016 onwards.

In this guide, we’ll break down the full-service schedule for the Triumph Bonneville T100 water-cooled model, what you need to check at each interval, and tips to ensure your Bonnie stays in top shape.
Triumph Bonneville in the Sun

Why the Triumph Bonneville Service Schedule Matters

Routine maintenance ensures that your Bonneville performs the way it was designed—smooth, dependable, and fun to ride. Adhering to the factory-recommended Triumph Bonneville service schedule can:
  • Extend engine life
  • Prevent costly repairs
  • Maintain fuel efficiency
  • Protect resale value
  • Keep your warranty valid (if applicable)
Neglecting maintenance, even basic oil changes or brake checks, can lead to performance loss or mechanical failure.

Triumph Bonneville T100 Service Schedule (Water-Cooled Models)
Here’s a breakdown of the official Triumph service intervals and the critical tasks involved:

Initial Service – 500 miles (800 km) / 1 Month
This first service is crucial to catch any settling or minor adjustments after the bike’s break-in period.
  • Replace engine oil and filter
  • Check and tighten all fasteners
  • Inspect clutch, throttle, brakes
  • Adjust chain tension
  • Review electronics and safety systems

Every 10,000 Miles (16,000 km) / 12 Months

This is the standard recurring service interval for Triumph’s water-cooled Bonneville range.
  • Engine oil and filter replacement
  • Inspect or replace air filter
  • Inspect or replace spark plugs
  • Lube and adjust chain
  • Throttle body synchronisation (if needed)
  • Full safety and systems inspection
  • Check brake pads and discs, tyre wear, suspension, and controls

Every 2 Years (Time-Based)

Even if you haven't hit the mileage, these time-based services are critical.
  • Replace brake fluid (DOT 4)
  • Replace coolant
  • Battery health check
  • Lubricate pivot points and levers
  • Clean fuel system and inspect injectors

Every 20,000 Miles (32,000 km)

This is a major service milestone for your Triumph Bonneville T100. It includes deeper engine checks and fluid replacements.
  • Valve clearance check and adjustment
  • Replace spark plugs
  • Replace air filter
  • Replace coolant (ethylene glycol-based OAT coolant recommended)
  • Replace brake fluid (DOT 4)
  • Check for software updates (if applicable)
  • Inspect fuel system and injectors
Triumph T100 Air Filter Recplacement

Triumph-Specific Maintenance Tips

  • Pay attention to the chain: Keep it clean, well-lubed, and correctly tensioned to avoid premature wear.
  • Brake fluid matters: DOT 4 fluid absorbs moisture over time, so even if the brakes feel fine, replace it every two years.
  • Stay software-current: Some newer Triumphs may receive ECU updates—check during dealer services.

Tracking Your Triumph Bonneville Service Schedule

To stay on top of things, consider creating a maintenance log or digital checklist. Apps like MyRide or even a simple spreadsheet can help track oil changes, inspections, and upcoming services. Many riders also like printing the schedule and attaching it to their garage wall or storing it in their maintenance binder.

Final Thoughts

Your Triumph Bonneville T100 or T120 is more than just a motorcycle—it’s a blend of classic style and modern performance. By following the Triumph Bonneville service schedule for water-cooled models, you’ll ensure years of worry-free riding.

From the initial 500-mile service to the 20,000-mile valve check, each service milestone plays a critical role in keeping your Bonneville running at its best. Stick to the intervals, use high-quality parts and fluids, and enjoy the ride with confidence.

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 work on your behalf.
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