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

UNIFILTER

UNI Filter 98-20 Honda CRF & XR 80/100 Hi-Flow Air Filter

$16.63

SKU: U01K UP-4125ST

In Stock
In Stock
Ships by Aug 3
Free Shipping over $100
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Description

Part #: UP-4125ST

Uni Filter Dirt Bike Foam Air Filters have been unsurpassed in both engine protection and overall performance for over 50 years. Their unique two-stage design produces more horsepower and more torque than any other air filter.

MIA's Description

The UNIFILTER UP-4125ST is a 2-stage pod-style air filter designed for high flow and excellent filtering capacity. Its progressive 2-stage design smooths airflow and traps particles before they enter the carburetor. The filter features a metal spring internal support to prevent collapse under high vacuum conditions. It is cleanable and reusable.

The UP-4125ST has a 3.5-inch (89mm) overall outside diameter, a 1.25-inch (31.75mm) inlet inside diameter, and an installed height of 3 inches (76mm). It includes a 0° straight inlet with no angle.

Fitment

Fitment Guaranteed

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

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Specifications

BrandUNIFILTER
Part NumberU01K UP-4125ST

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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