Sprint Filter P08 F1-85 Air Filter for Racing – Honda CB125R (2018–2026) SM219S F1-85

Two things change when a P08 F1-85 goes into a Honda CB125R, and only one of them is an advantage. The medium passes 15,000 l/m²/sec where the standard P08 passes 5,050, and it filters at 85 microns where the P08 filters at 80. On this machine the extra air has nowhere to go: an A1 single is built and type-approved to a fixed output, and its standard intake was never the thing holding it there. The wider weave, meanwhile, is in circuit for every kilometre the bike covers, for as long as the element stays in the airbox. An uncertain gain set against a small but certain cost is the honest shape of this purchase, and it is why the SM219S F1-85 suits a CB125R that races and very few that do not.

Key Features

• P08 F1-85 racing medium: 85 micron filtration, 15,000 l/m²/sec of airflow
• Dry polyester end to end, so there is nothing that could travel downstream onto a sensor
• Considerably more media area than a conventional performance element of the same size
• Fits the series airbox exactly as supplied; nothing is cut and no remap follows
• Serviced with a compressor rather than thrown away, and refitted dry
• Meant to stay with the motorcycle for its whole life, with two years of cover from purchase

The side of the trade that pays

Flow is worth buying when something downstream is asking for it. On a race-prepared CB125R with a freer exhaust, its own fuelling and an engine stripped on a schedule counted in hours, the intake can become the narrow point near peak revs, and a fabric rated at three times the flow is a real answer. On a standard bike it is capacity nobody has ordered. The 125 makes the output its class permits whatever sits in the airbox, and Honda specified the original element with margin already in hand.

The side that always charges

Five microns of extra aperture is very little per particle. It is not very little across ten years of daily riding, because the coarser fabric is working every hour the engine runs, and what it lets by accumulates in places nobody opens up on a small road bike. The two halves of this exchange run on different clocks: one only appears under conditions a standard CB125R never reaches, the other applies continuously. Ridden on the road, this bike is better served by the P08 at 80 microns and 5,050 l/m²/sec, and where the roads are dusty by the P14, which goes down to 14 microns and gives up flow to get there.

Care and cleaning

Compressed air does most of the work: apply it to the clean face and push the dirt back out the way it arrived, then refit the SM219S F1-85 dry. When a season leaves more behind than air will shift, lukewarm water with a mild detergent finishes the job, rinsed until it runs clear and left to dry in open air, never against a heater or over a flame. Oil plays no part at any stage. The Sprint Filter maintenance sheet is in the Downloads tab.

Fitment & Compatibility

Made for the Honda CB125R from 2018 to 2026. The same SM219S F1-85 element covers four machines in the Neo Sports Café range, from the 125 through to the 300; the complete list is in the Fitment tab.