Sprint Filter P08 F1-85 Air Filter for Racing – Triumph Daytona 675 R (2013–2018) PM143S F1-85

Production-based racing is defined less by what a team may add than by what the rules refuse to let it touch. Classes built around machines like the 675 R keep the airbox, its ducting and its volume as the factory delivered them, while leaving the element inside free to be exchanged. That single permitted swap is why media of this kind exist at all. The Sprint Filter PM143S F1-85 is that element: dry woven polyester with an 85 µm aperture and a flow of 15,000 l/m²/sec, in a box nobody is allowed to alter.

Key Features

• Racing specification: aperture 85 µm, flow 15,000 l/m²/sec, against 80 µm and 5,050 l/m²/sec for the road-and-track P08
• Coarser than the standard weave: the flow is won by holding back less
• Polyester fabric always run dry, so there is no oil film to travel towards the sensor or the inlet
• Fits the series airbox as supplied: a standard box with a different panel in it, nothing cut or repositioned
• Compressed air returns it to its starting restriction between outings; water and mild detergent when that falls short
• Two years of warranty from purchase, on a part meant to outlive several sets of disposable elements

The only variable inside a sealed box

When the intake path is frozen by regulation, the panel in the middle of it is the one thing a rider can still specify, and the choice narrows to one question: how much air does the fabric pass per square metre. That is why racing media are coarse. Nobody weaves a wider aperture because it filters better; they weave it because the intake is the last place a restriction can be removed. It is a deliberate exchange, and reading it as an upgrade in every direction is the mistake to avoid on a bike that also sees public roads.

An account that is settled every winter

A race engine is a serviceable item with a calendar. Pistons, rings and valve seats are inspected at set hours, and whatever passed the filter turns up while the motor is apart. Against that background an aperture of 85 µm is defensible. A road-registered 675 R with tens of thousands of kilometres ahead and no plan to open the engine is a different proposition, and there the standard P08 aperture is the more conservative choice. Which of the two a motorcycle is comes down to how it is ridden and serviced, not to what is written on the side panel.

Care and cleaning

Cleaning the PM143S F1-85 means blowing it through from the side facing the throttle bodies, outwards, so nothing is pressed deeper into the fabric. If the panel is properly dirty, wash it in lukewarm water with mild detergent and rinse until the water runs clear. It then dries fully in moving air, never over heat and never near a flame, and goes back only when dry through. No stage involves oil, which is the point of a dry medium. The Downloads tab carries the maintenance sheet.

Fitment & Compatibility

Built for the Triumph Daytona 675 R, 2013–2018. The same part number serves three machines around this airbox: the Daytona 675 R, the Daytona 675 and the Street Triple 675. Their model years are listed in the Fitment tab.