Air and Fuel› Air Cleaners, Filters, Intakes and Components

UNIFILTER

Uni Filter 87-91 KTM 125/350 2 Stroke / 82-96 KTM 500 / 540 / 550 2 Stroke / 85-89 250 Air Filter

$40.30

SKU: U01K NU-1406ST

Special Order
Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Description

The UNIFILTER NU-1406ST is a two-stage foam air filter designed for enhanced engine protection and performance. It utilizes a dual-layer foam system, with a large pore pre-filter to capture larger particles and a smaller pore inner filter to prevent fine grit from reaching the engine's cylinder. This air filter is known for trapping dirt and dust effectively while maintaining optimal airflow.

Uni Filter has been a provider of air filtration solutions for over 50 years, focusing on polyurethane foam for its superior dirt-capturing capabilities and reusability. The NU-1406ST is a competition-style air filter, favored by offroad teams for its ability to perform in harsh conditions.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandUNIFILTER
Part NumberU01K NU-1406ST

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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