Triumph Trident 660 (2021+) Maintenance Schedule

This is the maintenance schedule for the Triumph Trident 660, a mid-size roadster from Triumph released in 2021, including the A2 / LAMS-approved version.

The Triumph Trident has the same name as its forebear from many years earlier, but it’s an all-new motorcycle. It has an inline three-cylinder engine (a “triple”) with 660cc of displacement, running a compression ratio of 11.95:1 for max power of 60 kW or 80 hp at 10250 rpm in unrestricted form.

The Trident 660 is also available in learner-legal form in many markets, including Europe, the UK, Australia, and New Zealand. Parts and maintenance are the same — it’s restricted but nothing fundamental changed in the build.

Being an all-new bike, it doesn’t have in common much with the Triumph Street Triple S, the LAMS-approved bike for some markets. But it does effectively take a portion of its market share.

The Triumph Trident 660 shares an engine and basic platform with Triumph’s entry-level adventure sport bike, the Triumph Tiger Sport 660.

Updated May 2023 to correct the maintenance intervals (10,000 mile / 16,000 km), and updated in Jan 2024 with the chain adjustment guidelines.

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Triumph Trident 660 Service Intervals

Basic service intervals for the Triumph Trident 660 are to change the oil and filter every 10000 miles / 16000 km or year.

Change the air filter and spark plugs every 20000 miles / 32000 km, and check the valves and the camshaft timing at the same time.

The Trident 660 has a hydraulic brake but cable clutch. So you need to keep the brake fluid fresh, and to maintain the clutch cable.

Finally, regularly clean, lubricate, and adjust the tension of the drive chain.

There’s more detail in the full maintenance schedule below.

What you need to service the Triumph Trident 660

Below is a list of general maintenance items you need to service your Trident 660.

Maintenance schedule for the Triumph Trident 660

Below is the maintenance schedule for the Triumph Trident 660.

The table has the same content as from the manual, though re-formatted slightly to make it easier to read.

Daily / Pre-ride checks

Do the following checks on the Triumph Trident 660 daily or before every ride. Also do them with every regular service.

Trident 660 regular maintenance schedule

Below is the regular maintenance schedule to be done every 10,000 miles or 16,000 kms – or every year.

Notes

• Do the daily checks as well as the scheduled checks below.
• If there’s both a time and distance interval (e.g. for oil changes), follow the earlier of the two.
• Items marked [T] need specialist Triumph equipment

Drive chain maintenance — Extra notes

Maintain your drive chain regularly — not just at major services.

In another section of the manual, Triumph recommends servicing the chain by the below schedule, and “also after riding in wet weather, on wet roads, or any time that the chain appears dry.”

Checking chain slack

To check the slack on the Trident 660, put the motorcycle in neutral, onto its kickstand, and on a level surface. Make sure there is no luggage or load on the bike.

Check the slack on the lower part of the chain, midway between the sprockets, and check it in multiple places (move the motorcycle forwards and backwards) as chains wear unevenly.

Slack on the Triumph Trident 660 is defined as the free movement of the chain.

Target chain slack for the Triumph Trident 660: 43-55 mm (1.7 – 2.15 in)

If the chain slack is out of spec, you need to adjust it.

Adjusting chain slack

To adjust the chain slack on the Trident 660, follow the steps below. The goal is to set it to 43mm to allow slack to increase with chain wear.

1. Loosen the rear axle nut with a breaker bar and the lock nuts on either side of the axle.
2. Turn the adjuster nuts to tighten (or loosen) the chain. Keep checking the chain tension to see if it has come within spec to 43 mm.
3. Keep an eye on the adjuster alignment on either side of the axle. Make sure that the adjustment is to the same point so the chain and wheel remain aligned.
4. When you’re done, tighten the axle to 110 Nm / 81 lb-ft.
5. Re-check the chain slack again to make sure it’s still within spec.
6. Tighten the adjuster nuts to 3 Nm / 2 lb-ft
7. Tighten the adjuster lock nuts to 15 Nm / 11 lb-ft.

Wheels, Tyres, and Tyre Pressures

The Triumph Trident 660 ships with Michelin Road 5 tyres, but you can fit most modern sportbike tyres onto it as it has very standard rim sizes.

The above are recommended starting point tyre pressures. Adjust tyre pressures as best suit your conditions.

About the Triumph Trident 660

The Triumph Trident 660 is an entry-level naked roadster, Triumph’s entrant into the “middleweight sports” category, a rapidly expanding market for motorcycles. It’s also a bike available in A2 or LAMS-restricted form, which means it can be learner-legal in Europe and the Asia-Pacific.

It’s designed to appeal to a wide range of riders:

• Casual riders who don’t want the most intense sportbike possible, and don’t want to spend that much
• New riders on their learner licenses (A2/LAMS) who want the same bike, just conforming to legal requirements
• People with a sense of nostalgia about the triples of old…

Unlike the Triumph Speed Triple and Street Triple bikes, the Trident 660 is not a high-strung sportbike. It’s not a bike people would buy intending to race (other than for fun!), and so its components — while not cheap as chips — are lower end than the other bikes, and aren’t designed to be pushed too hard.

But that isn’t to say the Trident 660 isn’t well-equipped — it is. It comes with competent tech right out of the box, including

• A ride-by-wire throttle
• Standard ABS (of course)
• Switchable traction control
• Two ride modes
• A TFT display
• All-LED lighting
• A slip-and-assist clutch (a relative rarity in its budget class)

The Triumph Trident 660’s motor revs happily above 10000 rpm — though not much further. But the speed and grace with which it gets there means that it’s a bike you’ll really enjoy flinging about back country roads.

The torque curve is extremely flat, with most of its torque available on a wide plateau between 3000 and 9000 rpm. This makes it really easy to ride in a range of styles from everyday commuting to getting RPMS up in back roads.

The suspension and braking are capable too. It comes with Showa upside down forks, though they’re non-adjustable, and a Showa preload-adjustable monoshock with a remote reservoir.

The non-adjustable nature of the front suspension is just one thing that differentiates the Triumph Trident 660 from higher-end alternatives, like the Aprilia Tuono 660, which has fully adjustable suspension (and costs about 50% more).

But the Trident’s spec is still on the upper end compared to most middleweight road bikes.

Some competitors to the Triumph Trident 660 are other middleweight motorcycles like the Kawasaki Z650, Honda CB650R, the Yamaha MT-07, and the Ducati Monster 659, which are all available in learner-legal incarnations in some markets.

For the 2024 model year, Triumph released the Triumph Daytona 660, a higher-spec middleweight sport bike with the same fundamental engine, but tuned for a bit more top-end. There are also a few other components that Triumph improved for the Daytona, listed below.

Manual for the Triumph Trident 660

The above maintenance schedule and service intervals come straight from the user manual for the Triumph Trident 660.

You can download the manual for the Trident 660 directly from Triumph’s website.