Sprint Filter P08 Air Filter for Road & Track – KTM 690 Duke (2008–2018) PM73S

KTM built the 690 Duke and the 690 SMC and Enduro around the same large single, and owners reasonably assume the service parts follow the engine. The air filter does not. The Duke takes PM73S; the SMC and Enduro of the very same years are listed under a different number entirely. An element is specified against the housing it seals into, and on these machines it is the chassis, not the engine, that decides what the housing looks like.

Key Features

• Dry P08 polyester, single layer, 80 µm at a rated 5,050 l/m²/sec
• Polyester threads from ø 22 microns — the filtering is done by the calibrated gap between them
• Roughly twice the filtering surface of other performance filters, inside the standard outline
• Direct replacement in the series airbox: no modification and no remap
• Never oiled, cleaned with compressed air and refitted dry
• Two years of warranty from purchase; specified to last the life of the motorcycle

Order by number, not by engine

The same displacement under two model names, two part numbers, and no way to tell them apart from the badge on the tank — that is the situation here, and it is worth being deliberate about. Check the code against the machine rather than reasoning from the engine, because the reasoning leads to the wrong shelf. It is a small point that costs a return if it is got wrong, and it applies in reverse too: an owner of a 690 SMC who lands on this page from a search for a 690 filter is on the wrong listing, and the neighbouring number is the right one.

What this number actually covers

Two machines. The KTM 690 Duke of 2008 to 2018 is the first, and the second is the 690 Supermoto built from 2007 to 2012 — old enough that it has no product page of its own here, but sharing the element all the same. The sibling number next to it carries three: the 690 SMC and Enduro plus the two Husqvarna 701s. So neither list is long, and neither overlaps the other. What the P08 does inside either housing is the same, and it is modest: it holds intake restriction low and, because it is washed rather than replaced, keeps it from creeping upward between services. It does not add power, and no element fitted in a standard airbox does.

Care and cleaning

PM73S is looked after with a compressor and a few minutes. Aim the line at the clean face and work outward, so that everything the weave trapped travels back out the way it came in. If the cloth still looks loaded, wash it — lukewarm water, a mild washing-up detergent, and a rinse until the water is clear. Then leave it. Every heat source stays away from it, guns and radiators and naked flame alike, because heat is the one thing polyester will not come back from. It is refitted dry and untreated. The maintenance sheet is in the Downloads tab.

Fitment & Compatibility

Cut for the airbox of the KTM 690 Duke built from 2008 to 2018. The other machine on this fitment list is the KTM 690 Supermoto of 2007 to 2012.