Sprint Filter P08 Air Filter for Road & Track – Moto Guzzi V9 Bobber (2016–2024) PM138S

A bobber is sold on a sensation. Fat front tyre, low bars, an 853 cc transverse twin that shoves from just above idle and does not much care what happens at the top of the tachometer — the appeal is the shove, and the shove is felt rather than measured. That creates an unusual maintenance problem, because the V9 has no instrument that reports on the thing you actually bought. The Sprint Filter P08 PM138S is a way of protecting a quality that nothing on the bike will tell you is fading.

Key Features

• Dry polyester cloth: no oil is present when new and none is added later
• Calibrated 80-micron aperture; Sprint Filter publish 93.13 % retention at 100 microns
• Filtering surface around twice that of other performance panels for this box
• Direct exchange with the standard element; no cutting, no adapters, no reflash
• Cleaned and refitted indefinitely instead of being replaced at every service
• Two years of manufacturer cover from the purchase date

Nothing announces itself

A blocked fuel filter throws a code. A worn chain makes a noise. A slowly loading air panel does neither: the management system meters fuel against the air that actually arrives, so the mixture stays correct and the bike stays perfectly healthy while becoming, week by week, slightly less muscular in exactly the way that sold it. There is no warning light for character. The only defence is a schedule, and the only schedule worth having is one you will actually keep — which argues for a panel that is cleaned in the garage rather than one that requires an order first.

Low revs leave nowhere to hide

The other half of the argument is arithmetic. An engine spinning at nine thousand has time and momentum to work around a restricted intake; one pulling hard at two and a half thousand does not. Each cylinder takes a large, separate gulp, and whatever the panel withholds during that gulp is withheld from the only part of the rev range a bobber uses. Fitting the PM138S will not add torque — nothing dropped into a series airbox does — but it keeps the intake close to its designed resistance throughout the interval instead of only at the start of one.

Care and cleaning

Compressed air on the clean face, worked outwards, is the standard service and takes minutes. For anything stubborn, wash the panel in hand-warm water with a mild detergent and keep rinsing while the water still colours. Then dry it completely in still room air — never with a heat gun, never on a radiator, never near a flame, since warmth deforms the weave without leaving any visible sign. Refit it dry and untreated. The maker's maintenance sheet is filed under Downloads.

Fitment & Compatibility

Listed for the Moto Guzzi V9 Bobber built from 2016 to 2024. The same panel serves twenty-one machines across the V7 and V9 ranges and three BMW singles; see the Fitment tab for the detail.