Lack of power / the bike won't pull like it used to on a Peugeot Django 125 2026

Clogged air filter

Diagnosis confirmed: a clogged air filter is choking the engine, pushing the mixture too rich, and causing a loss of power, sometimes with black smoke and higher fuel consumption. This is one of the simplest and most rewarding maintenance jobs on a bike. The idea: clean the filter if it's a washable type, or replace it if it's a paper type or too far gone, to restore normal airflow. Risk level is none, and it's an ideal job to start out on. The method depends on the filter type: a dry paper filter gets replaced (never washed); an oiled foam filter (like DNA) or oiled cotton filter (like K&N) gets cleaned with a dedicated product, dried, then re-oiled with the manufacturer's specific oil -- not too much (that chokes the intake and can foul an airflow sensor on fuel-injected bikes), and not too little (the filter won't trap anything). Warning: never run the engine without a filter, you'd be sucking abrasive dust straight into the cylinder. Cost-wise: a new paper filter runs roughly 10 to 40 euros depending on the model; a cleaning kit for a cotton/foam filter, around 15 to 25 euros, and covers many cleanings. The service interval depends heavily on how you ride: dusty, wet, or off-road riding clogs a filter far faster than road use -- check the interval in your manual. A clean filter often gives the engine an immediate boost of pep. This tool helps you understand what's going on -- it doesn't replace a certified mechanic.

How to make the repair yourself

🟢 Within reach of any rider: no advanced mechanical skill or specialised tooling needed.

1. 1Locate the air filter housing (often under the seat, under the tank, or on one side) and check how it's fastened: clips, Phillips screws, or hex screws. If needed, remove the seat, side panels, or tank to get to it.
2. 2Open the housing carefully and note the filter's orientation and mounting direction (take a photo) so you can refit it exactly the same way. Avoid letting dirt fall into the now-open intake tract.
3. 3Take the filter out and inspect it: gray-black and clogged paper means replace it; dirty but sound foam or cotton means clean it. Also check the housing and intake tract for debris, leaves, or signs of rodents.
4. 4Paper filter: replace it with a new one of the correct part number. Don't try to wash it or blow it out aggressively, you'd destroy the filter media.
5. 5Foam or cotton filter: clean it with the manufacturer's dedicated product (or soapy water for foam), rinse, let it dry completely in open air -- never in strong heat -- then re-oil it evenly with the specific oil, without overdoing it.
6. 6Wipe the inside of the housing with a clean, slightly damp cloth to remove dust and buildup, without letting anything fall into the intake. Check the condition of the cover's seal.
7. 7Refit the filter the right way round, close the housing making sure it seals properly (a poorly closed housing lets in unfiltered air), then put back anything you removed (tank, panels, seat).
8. 8Start the engine and take a short test ride: throttle response should feel noticeably crisper, and any black smoke, if that was the cause, should be gone. Note the date and mileage for planning the next service.