Bajaj Genuine Air Filter JL581142 for Pulsar NS400Z & Select Dominar 400

Bajaj Genuine Air Filter Element JL581142 is a replaceable engine air cleaner cartridge for the Bajaj Pulsar NS400Z and certain later Bajaj Dominar 400 airbox configurations. Also searched as the NS400Z air filter, Pulsar NS400 air filter, air cleaner element, air filter cartridge or engine intake filter, this is the individual filter element—not the complete air cleaner housing.

Important fitment check: JL581142 is catalogue-confirmed for Pulsar NS400Z 2024 and 2025 references. The Dominar 400 catalogue shows JL581142 as a variant-specific filter associated with a January 2025 / OBD2B change; earlier Dominar 400 airboxes may take DT581062 instead. Do not order solely by motorcycle name or engine size.

Quick Product Check

Motorcycle Compatibility — Check the Exact Model and Airbox

Important: A motorcycle being called “NS400”, “NS400Z”, “Dominar 400” or having a similar engine does not by itself establish interchangeability. Year, emission standard, OBD revision, airbox housing and existing filter part number can change the correct part.

JL581142 vs DT581062 vs JL581009 — Do Not Confuse

What Does the Engine Air Filter Do?

The engine air filter sits in the intake airbox and captures airborne dust and debris before intake air reaches the engine. Regular inspection is particularly relevant when a motorcycle is ridden on dusty roads or in frequent stop-and-go conditions. A damaged, poorly seated or heavily restricted filter may affect intake airflow, so the correct airbox fit and seating are just as important as selecting the correct part number.

When Should You Inspect or Replace the Filter?

• At the air-filter inspection or replacement interval specified in the owner’s/service manual.
• When the element is visibly overloaded with dust, torn, deformed, wet with contamination or otherwise damaged.
• After unusually dusty riding, if the recommended maintenance schedule calls for more frequent inspection.
• If the airbox has been opened for service and the element or seals are not seated correctly.
• If a workshop confirms that restricted airflow or filter damage is contributing to an intake-related complaint.

Diagnostic note: Low performance, abnormal fuel consumption, hesitation or difficult starting can have many causes, including ignition, fuel-delivery, sensor, throttle-body and mechanical faults. Do not assume that replacing the air filter will automatically resolve these symptoms.

Why Choose This Bajaj Genuine Replacement?

• Exact part identification: JL581142 is the original Bajaj spare-part reference, not an aftermarket cross-reference.
• Application clarity: the listing separates confirmed NS400Z use from revised-configuration Dominar 400 use.
• Individual service component: suitable when the filter element alone needs replacement rather than the full airbox.
• Genuine-pack identification: supplied in Bajaj Genuine Parts packaging; the pictured stock shows the factory part number and printed MRP.
• Reduced ordering errors: clear distinctions between JL581142, DT581062 and separate airbox seals.

Package Contents & Exclusions

Included: 1 × Bajaj Genuine engine air filter element, part number JL581142.

Not included: complete air-filter/airbox assembly, intake duct, the two separately catalogued JL581146 top-cover seals, screws, other sealing components, service tools or the Under The Hood keychain used as a photography prop. Images of the sealed packet are for identification of the actual stock; the display keychain is not part of the sale.

Before You Order — Four-Point Fitment Checklist

1. Model: confirm Pulsar NS400Z or the exact Dominar 400 revision, not only “Bajaj 400”.
2. Part number: check the original element or official vehicle-specific Bajaj catalogue for JL581142.
3. Airbox revision: for Dominar 400, investigate the older DT581062 versus later JL581142 application; on NS400Z, confirm any OBD2B air cleaner housing revisions.
4. Condition and sealing: if damaged, inspect the separate seals and airbox cover; they are not supplied in this pack.

Fitting, Service and Care Notes

• Have a qualified technician locate and open the model-specific airbox using the correct service procedure.
• Remove the old filter carefully so accumulated dirt does not fall into the clean intake side.
• Inspect the airbox, seating edge, cover and separately fitted seals for debris or damage.
• Fit the new element in the correct orientation and make sure it sits evenly without a gap or pinched edge.
• Refit all cover fasteners and intake connections using the service-manual procedure; check for loose fittings.
• Do not wash, oil, blow out with high-pressure air or reuse a filter unless Bajaj specifically approves that cleaning procedure for this exact element.
• Follow Bajaj’s inspection/replacement interval for your actual model and riding conditions. No universal kilometre interval is claimed for this SKU.

Frequently Asked Questions

Q. Is JL581142 a Bajaj Genuine part?

Yes. The photographed stock is packaged as Bajaj Genuine Parts and bears part number JL581142. This is not presented as a third-party aftermarket item.

Q. Does JL581142 fit the Bajaj Pulsar NS400Z?

Yes. The part is listed as the engine air-filter element in the NS400Z 2024 and 2025 air-cleaner parts references. Confirm the particular vehicle revision if modified or from a later production year.

Q. Does it fit the 2026 Pulsar NS400Z?

It may be used in some later-production bikes, but the available checked references here do not establish every 2026 airbox revision. Confirm the exact part number in the vehicle-specific parts catalogue before purchase.

Q. Can I install it on my Dominar 400?

Only on Dominar 400 configurations specifying JL581142. The later OBD2B catalogue includes this part, while other Dominar 400 versions list DT581062. Confirm by chassis-specific parts data or the existing filter number.

Q. Is it compatible with all Dominar 400 BS6 motorcycles?

No universal claim is made. Earlier and later Dominar 400 airboxes/filters can differ, and BS6 alone is not sufficient identification.

Q. Is JL581142 the same as DT581062?

They are different Bajaj part numbers. A parts catalogue may show each for different airbox versions; do not substitute them unless the vehicle-specific Bajaj reference confirms the replacement.

Q. Does this filter work on Dominar 250?

Dominar 250 compatibility was not established for JL581142. Check the actual Dominar 250 service parts reference before ordering.

Q. Can it fit Pulsar NS200 or RS200?

Do not assume so. The NS200 and RS200 families have their own part-number histories; purchase by the exact part reference rather than shared “Pulsar” naming.

Q. What exactly comes in the package?

One Bajaj Genuine JL581142 air filter element. It is not the full airbox assembly, and the photographer’s Under The Hood keychain is not included.

Q. Are the top-cover seals supplied with this filter?

No. The NS400Z catalogue lists JL581146 cover seals separately. Inspect them during service and order separately where needed.

Q. Is this the full air-filter assembly?

No. JL581142 identifies the replaceable filter element; the complete air cleaner housing is a different part.

Q. Can I wash and reuse the element?

Do not assume it is washable or reusable. Treat it as a replaceable filter and follow the Bajaj manual for the exact element, rather than applying instructions intended for reusable performance filters.

Q. Will a new air filter improve mileage or horsepower?

No specific power or fuel-economy gain is guaranteed. A correct, serviceable filter helps keep the intake system properly maintained, but vehicle performance depends on many other factors.

Q. When should I replace the NS400Z air filter?

Follow the inspection and replacement intervals in the correct Bajaj owner/service manual. Dusty use, visible restriction or damage may justify earlier inspection.

Q. How do I avoid ordering the wrong filter?

Provide the motorcycle model, year, VIN/chassis details where appropriate and a clear photograph of the current air-filter element or part-number label so the airbox variant can be checked before dispatch.

Buyer Search Terms & Part Identification

Bajaj NS400Z air filter; Pulsar NS400Z original air filter; Bajaj JL581142; JL 5811 42; Bajaj air filter cartridge; NS400Z filter element; NS400Z engine air cleaner filter; selected Dominar 400 OBD2B air filter; Bajaj genuine air cleaner element. These terms describe this one actual part; fitment remains subject to the compatibility notes above.

Ordering reminder: Always match the exact part number. For shortage or transit-damage reporting, retain the packaging and follow Under The Hood’s unboxing-video policy.