Dirt bike bogs and loses power: dirty air filter
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Applies to: KTM, Yamaha YZ, Kawasaki KX and all off-road bikes
Symptoms
- Bogs off the bottom, feels flat
- Runs rich, black plug
- Worse after dusty rides
Why it happens
A dirty or over-oiled foam filter chokes the engine. A badly seated filter lets dirt past and wears the engine fast.
How to fix it
- Remove the filter and look for dirt on the intake side of the cage.
- Wash the foam in filter cleaner, dry it fully.
- Oil it evenly with filter oil and squeeze out the excess.
- Grease the rim and seat it fully in the airbox.
Tools and parts
- Filter cleaner and oil
- Spare air filter
- Grease
What the factory service manual covers
Air filter service, maintenance intervals, carburetor or EFI settings. The full procedure, specs and wiring diagrams are in the factory service manual for your machine.