The Monster 821 Dark leaves out the colour: matt black paint and very little brightwork, a bike for riders who prefer understatement. Many of these Monsters are ridden daily and looked after at home, and the small jobs, the oil check among them, fall to the owner. After any such job one question remains, namely whether everything has stayed tight. For the Dark of 2015 to 2020, Accossato lists the FP004, an aluminium oil filler cap with an M20x2.5 thread, CNC-machined and anodised in eight colours.

Key Features

• Oil filler cap for the Ducati Monster 821 Dark, 2015 to 2020
• Thread M20x2.5, as given by Accossato
• Aluminium, CNC-machined, anodised
• Eight colours: black, titanium, silver, gold, red, orange, blue, green
• Usable on other bikes with the same cap size after checking
• Black or titanium keep the Dark entirely dark
• No German ABE documented; for track use

Construction and Material Quality

Accossato mills the FP004 on CNC machines and anodises it afterwards, so the colour belongs to the surface of the metal. On a matt black Monster 821 Dark, black or titanium keep the look closed and quiet, silver lightens it slightly, and gold, red, orange, blue or green become a single spot of colour on an otherwise dark machine. The thread is M20x2.5. Accossato says the cap suits the applications on its list and can be adapted to other motorcycles with the same cap size, so the thread is the thing to check if you are unsure.

A Sheet of Cardboard Under the Engine

Small leaks rarely announce themselves while you ride. They turn up later as a drop on the floor, and in a shared courtyard or a rented garage that drop quickly becomes somebody else's concern as well. An old workshop habit catches them early: after any work on the engine, park the bike overnight over a clean sheet of cardboard, and the next morning any mark on it shows where to look. The oil job itself follows a few simple rules. Open the filler only when the engine is off and has cooled down. Read the level exactly as the owner's manual of the Monster 821 Dark sets out, and add oil in small amounts, checking again before pouring more. Keep dirt out of the opening, clean the thread and the sealing face, and turn the FP004 in with your fingers until it seats, with no extra force. Then go for a ride. Afterwards the engine has been warm, the oil has circulated, and the cardboard under the parked bike gives an honest answer. If it stays clean and the filler area is dry, the job is finished; if not, find the cause before riding again.

Fitment and Compatibility

For the FP004, Accossato's list gives the Monster 821 Dark of 2015 to 2020. Because the cap is defined by its M20x2.5 thread, the manufacturer says it can also be adapted to other motorcycles with the same cap size. We catalogue the same part for the standard Monster 821, the Monster 795 and the Hypermotard 950 SP. If you are unsure which cap your Dark wears today, compare its thread before ordering.

Road Approval

For the FP004 we hold neither an ABE nor any other test document; it is therefore offered for racing and competition.

Scope of Delivery

The FP004 filler cap, one piece, in the colour you choose.

Specifications

• Type: Oil filler cap
• Part number: FP004
• Thread: M20x2.5
• Material: CNC-machined aluminium, anodised
• Colours: Black, silver, titanium, red, blue, gold, green, orange
• Fitment: Ducati MONSTER 821 DARK (2015–2020)
• Road approval: None documented, track use only
• Check: Other motorcycles with a M20x2.5 cap thread: compare before ordering

• 1x Accossato oil filler cap

• Ducati MONSTER 821 DARK (2015–2020)
• Ducati DESERT X (2022–2024)
• Ducati DIAVEL (2011–2018)
• Ducati DIAVEL CARBON (2011–2013, 2015–2018)
• Ducati HYPERMOTARD 821 (2013–2015)
• Ducati HYPERMOTARD 939 (2016–2018)
• Ducati HYPERMOTARD 950 (2019)
• Ducati HYPERMOTARD 950 SP (2019)
• Ducati Hyperstrada 821 (2013–2016)
• Ducati MONSTER 1200 (2014–2017)
• Ducati MONSTER 1200 S (2014–2017)
• Ducati MONSTER 795 (2014–2015)
• Ducati MONSTER 821 (2015–2019)
• Ducati MONSTER 821 STRIPE (2015–2017)
• Ducati MULTISTRADA 1200 (2010–2017)
• Ducati MULTISTRADA 950 (2017–2020)
• Ducati Panigale 1199 (2012–2015)
• Ducati Panigale 1199 R (2013–2017)
• Ducati Panigale 1199 S (2012–2015)
• Ducati Panigale 1299 (2015–2018)
• Ducati Panigale 1299 S (2015–2017)
• Ducati Panigale 899 (2012–2015)
• Ducati Panigale 959 (2016–2019)
• Ducati Panigale V4 (2018–2019)
• Ducati Panigale V4 R (2019)
• Ducati Panigale V4 S (2018–2019)
• Ducati SCRAMBLER 800 (2015–2018)
• Ducati STREETFIGHTER 848 (2011–2016)
• Honda CB 1000 R RA (2008–2016)
• Honda CB1000R (2018)
• Honda CB1100EX (2014–2018)
• Honda CB1100RS (2017–2018)
• Honda CB125F (2015–2018)
• Honda CB500F (2013–2018)
• Honda CB500X (2013–2018)
• Honda CB600F HORNET (2002–2015)
• Honda CB650F (2014–2018)
• Honda CBR 1000 RR (2004–2019)
• Honda CBR 600 RR (2003–2016)
• Honda CBR125R (2007–2016)
• Honda CBR250R (2011–2015)
• Honda CBR300R (2015–2017)
• Honda CBR500R (2013–2018)
• Honda CBR650F (2014–2016)
• Honda CMX 500 REBEL (2014–2018)
• Honda CRF1000L AFRICA TWIN (2016–2019)
• Honda CROSSTOURER (2012–2018)
• Honda NC750S (2014–2018)
• Honda NC750X (2014–2018)
• Honda VFR1200F (2010–2016)
• Honda VFR800F (2014–2018)
• Kawasaki ER-6 F (2006–2016)
• Kawasaki ER-6N (2006–2016)
• Kawasaki NINJA 125 (2019–2020)
• Kawasaki NINJA 250SL (2015–2016)
• Kawasaki NINJA 650 (2017–2019)
• Kawasaki Ninja 400 (2018–2020)
• Kawasaki VERSYS 650 (2006–2020)
• Kawasaki VULCAN S (2015–2020)
• Kawasaki VULCAN S CAFE (2017–2019)
• Kawasaki Z1000 (2010–2020)
• Kawasaki Z1000R EDITION (2017–2020)
• Kawasaki Z1000SX (2010–2018)
• Kawasaki Z125 (2019–2020)
• Kawasaki Z250SL (2015–2017)
• Kawasaki Z400 (2019)
• Kawasaki Z650 (2017–2019)
• Kawasaki Z800 (2013–2016)
• Kawasaki Z800E (2013–2016)
• Kawasaki Z900 (2017–2019)
• Kawasaki Z900RS (2018–2020)
• Kawasaki Z900RS CAFE (2018–2020)
• Triumph Daytona 675 R (2014–2015)
• Triumph SPEED TRIPLE 1050 (2005–2015)
• Triumph STREET TRIPLE 675 (2013–2016)
• Triumph Street Triple 765 RS (2017–2019)
• Yamaha MT-09 (2013–2020)
• Yamaha MT-09 SP (2018–2020)
• Yamaha NIKEN (2018)
• Yamaha NIKEN GT (2019)
• Yamaha TRACER 900 (2013–2020)
• Yamaha TRACER 900 GT (2018–2020)
• Yamaha XSR900 (2016–2020)
• Yamaha YZF-R125 (2008–2018)

Show all 84 bikesShow less▼