Oil and filter change
≈ 12,000 km or 1 year
JASO MA or MA2 approved four-stroke motorcycle oil (JASO MB on scooters): an “energy conserving” car oil makes the wet clutch slip. Change it more often in city use or on track.
Source [1]Monster 821 · 2018–2020
Ducati Monster 821 821 · 109 hp (2018 to 2020)
The Ducati Monster 821 821 uses the Ducati Testastretta 11° 821 petrol engine with 109 hp.
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Technical specifications
- Fuel
- Petrol
- Power
- 109 PS / 80 kW
- Displacement
- 821 cm³
- Cylinders
- 2
- Engine code
- Ducati Testastretta 11° 821
- Period covered
- 2018–2020
- Documented market
- Europe
Transmission
- Manual · 6 speeds
Figures apply to the cited configuration and market; equipment and transmissions may vary by production date.
Specification source : [1] AutoKarnet
This version
109 hp (80 kW), chain final drive, 6-speed manual. Built from 2018 to 2020.
AutoKarnet advice
In the range
It sits between the 821 A2 (48 hp) and the 821 (112 hp). It replaces the 112 hp version built until 2017. The Ducati Testastretta 11° 821 engine is also fitted to: Ducati Hypermotard (Hypermotard 821).
AutoKarnet advice
Body style and inspection points
On a motorcycle, tyres, final drive and brakes matter as much as the oil change. Check the tyre manufacturing date, steering-head play and fork-tube seals; an oil film on a tube means a fork seal needs replacing. A notched steering bearing can be felt when braking at low speed.
AutoKarnet advice
Distinguishing similar versions
Among the Monster 821 pages, the 821 112 hp offers a comparison: 112 hp (82 kW), Ducati Testastretta 11° 821, 821 cm³, 6-speed manual, 2014–2017. The version on this page has 109 hp (80 kW), Ducati Testastretta 11° 821, 821 cm³, 6-speed manual, 2018–2020. When requesting a quote, specify the output and gearbox; the marketing name alone does not identify the correct parts.
AutoKarnet advice
Maintenance and records
≈: estimated reference — the vehicle’s service indicator prevails.
Brake fluid
Every 2 years
Replace the fluid in both circuits (and the hydraulic clutch if fitted), whatever the mileage; dark fluid has absorbed moisture.
Source [1]Fork oil
≈ 30,000 km
Fork oil change and seal check; an oil film on the tubes means a seal needs replacing before it contaminates the brake caliper.
Source [1]Chain kit (chain and sprockets)
≈ 25,000 km
Lubricate and check the tension every 500 to 1,000 km and after rain; replace chain and sprockets together when the chain no longer holds its tension or the teeth are hooked.
Source [1]Timing belts
30,000 km or 5 years
Replace both belts at whichever comes first, even on a little-used bike: the rubber ages, and a broken belt destroys the engine.
Source [1]Spark plugs
Every 30,000 km
Replace the full set; worn plugs raise consumption and cause misfires.
Source [1]Air filter
Every 30,000 km
Replace more often in dusty conditions.
Source [1]Valve clearance
Every 30,000 km
Check and adjust if needed, often together with the plugs; too little clearance burns the valves, too much makes the engine noisy.
Source [1]Coolant
Every 3 years
Replace the coolant and check the hoses and radiator; check the level cold between services.
Source [1]Questions about this version (3)
Which engine is in the Ducati Monster 821 821?
The Ducati Testastretta 11° 821 petrol engine (821 cc), 109 hp (80 kW).
AutoKarnet advice
Which oil for the Ducati Monster 821?
A JASO MA2 10W-40 four-stroke motorcycle oil suited to the Ducati Testastretta 11° 821 engine.
AutoKarnet advice
How do I check this page matches my car?
This page covers Ducati Monster 821 821 109 hp, naked bike, 2018–2020, with 109 hp (80 kW), Ducati Testastretta 11° 821, 821 cm³, 6-speed manual, 2018–2020. Compare these details with the registration document and gearbox identification. The designation Ducati Testastretta 11° 821 may cover several revisions: a VIN is still needed to confirm part numbers.
AutoKarnet advice
Documentary sources
- [1] Rédaction AutoKarnet
AutoKarnet · FR · Europe · Synthèse éditoriale AutoKarnet · Accessed 09/10/2026