Rotax intake silencer: how to clean and oil the air filter
Updated: 3 days ago
Everyone looks at the carburettor, the spark plug, the exhaust valve. But before all of that there is the intake silencer. All the air the engine breathes passes through here, and if the filter is dirty or damaged the Rotax cannot perform at its best. Let's see what it does, how to clean it and which mistakes to avoid.
In short The Rotax intake silencer contains the air filter: it cleans the air entering the engine and reduces intake noise. The filter should be cleaned when it is dirty and during engine maintenance, with biodegradable products, then oiled and replaced if it is damaged. After every session in the rain the filter cleaning kit should be used.
What the Rotax intake silencer does
On the Rotax MAX EVO the intake silencer integrates the air filter. It has two jobs: cleaning the air entering the carburettor and reducing intake noise. The filter is made of several layers and is optimised in the airflow area.
A dirty filter lets less air through, a damaged filter lets dust and dirt in: either way the engine suffers. That is why its maintenance is part of the engine routine, together with what is described in the guide to Rotax engine maintenance.
When to clean the Rotax air filter
• When it is dirty: if the filter looks dirty, it must be cleaned.
• During engine maintenance: every job on the engine is the right moment to check it.
• After every session in the rain: use the air filter cleaning kit.
• If it is damaged: a filter with visible damage is replaced, not repaired.
How to clean the Rotax intake silencer step by step
• 1. Remove it and close the intake: take off the silencer and immediately close the carburettor inlet with a Rotax intake cap, so no dirt gets in while you work.
• 2. Take out the filter: separate the filter from the silencer body and check it has no tears or deformed parts.
• 3. Wash with biodegradable products: use biodegradable products. No petrol or aggressive solvents.
• 4. Let it dry thoroughly: the filter must be dry before you oil it and refit it.
• 5. Apply the oil: the Rotax maintenance schedule says to oil the filter after cleaning. Spread the oil evenly, without overdoing it.
• 6. Clean the silencer body too: dust and residue also stay in the two halves of the silencer and in the tube.
• 7. Refit and check the seal: make sure the filter is seated, the silencer is properly closed and the clamp is tightened correctly.
The most common mistakes
• Running with a dirty filter: less air to the engine and worse response.
• Using petrol or solvents: they can damage the layers of the filter. Always use biodegradable products.
• Refitting the filter wet: it must be left to dry before oiling.
• Forgetting to clean it after rain: water and dirt from the track end up in the filter.
• Refitting without checking the seal: a silencer that is not properly closed lets unfiltered air through.
Genuine spare parts for the Rotax intake silencer
If the filter is damaged or a part is broken, it is replaced with genuine Rotax spare parts. For the Rotax MAX EVO you will find the Rotax MAX EVO air filter, the lower silencer body and upper silencer body, the silencer tube and the 50-70 filter clamp. For the DD2 there is the Rotax DD2 air filter.
Read more: Dell'Orto VHSB 34 XS carburettor and reading the spark plug. · Kart cleaning: how to wash your kart after the track and what to check →
Frequently asked questions
How often should the Rotax intake silencer filter be cleaned?
Clean it when it is dirty and during engine maintenance, and use the air filter cleaning kit after every session in the rain.
Does the Rotax air filter need oiling?
Yes. In the Rotax maintenance schedule the item reads: clean the filter, apply oil and replace it in case of visible damage.
What do you wash the filter with?
With biodegradable products. Avoid aggressive solvents or petrol, which can damage the layers of the filter.
Source: official Rotax MAX EVO manual and Rotax maintenance schedule.
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Read also: Rotax engine maintenance: routine and rebuild → · Engine bogging on corner exit → · Dell'Orto VHSB 34 XS carburettor →
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Author: Sergio, TKS RaceLab | Published: 18 October 2026
TKS RaceLab is the Italian online store dedicated to karting: spare parts, accessories and everything you need to get on track. With Arrive & Drive you arrive at South Garda Karting (Lonato), Franciacorta, Cremona or Ala and find your kart ready to go. No hassle, just driving.
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