NU-2241ST Uni-Filter Air Filter for Yamaha YZ250 1978 YZ 250

Air Filter for Yamaha YZ250

This Uni-Filter air filter (NU-2241ST) replaces the factory filter on 1978 Yamaha YZ 250 models, trapping dust and debris before it reaches the carburetor.

Overview

This Uni-Filter air filter is a direct-fit replacement for the 1978 Yamaha YZ 250, engineered to keep dirt, sand, and dust out of the intake. Riders rebuilding or maintaining a vintage YZ250 rely on a fresh air filter to protect the engine and hold consistent airflow. The NU-2241ST filter is built for off-road use where clean intake air matters most.

Built For Performance

• Dual-layer foam construction traps fine dust while maintaining airflow
• Designed as a direct replacement for the factory filter cage
• Washable and re-oilable for repeated service intervals
• Resists fuel and oil breakdown common in two-stroke intake systems
• Seals against the airbox to limit unfiltered air bypass

Fits These Machines

• for Yamaha YZ 250 (1978)
• for Yamaha YZ250

On-The-Job Use

• Motocross and trail riding on dusty tracks
• Routine airbox service on vintage two-stroke builds
• Restoration projects returning a YZ250 to riding condition

Specs At A Glance

Good To Know

Q: How often should this air filter be cleaned? A: Clean and re-oil it after every few rides in dusty conditions, or more often if you ride in sand or loose dirt. A clogged filter restricts airflow and can affect jetting.

Q: Does this filter need oil before use? A: Yes, foam filters should be oiled with a proper foam filter oil to catch fine dust particles. Install it dry only if the manufacturer instructions specify otherwise.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.