Choosing the right air filter for a 125cc dirt bike can improve airflow, power, and engine life. This guide reviews five reliable filters that fit commonly used 125cc models from Taotao, Coolster, Baja, Roketa, and similar brands. Each option emphasizes compatibility, filtration quality, and ease of replacement to help riders maximize performance without sacrificing reliability.
| Product | Brand | Core Compatibility | Diameter | Carb Fit |
|---|---|---|---|---|
| RETEPIF 35mm Air Filter | Retepif | 70cc–125cc Chinese ATVs, dirt bikes | 35mm inside | PZ16/PZ19/PZ20 |
| HIAORS 35mm Air Filter | HIAORS | 49cc–125cc ATV/Go Kart/Dirt Bike | 35mm | PZ19/PZ20 |
| CIOM 35mm Air Filter | CIOM | 50cc–150cc Chinese ATVs | 35mm | PZ16/PZ19/PZ20 |
| LCGLY 42mm Universal Air Filter | LCGLY | GY6 family 125cc–250cc | 42mm | PZ24/PZ30 |
| EOPOAYI 35mm Air Filter | EOPOAYI | 50cc–125cc Taotao/Coolster etc. | 35mm | PZ19/PZ20 |
RETEPIF 35mm Air Filter For 125cc Dirt Bikes
This 35mm filter is designed to fit most 70cc–125cc Chinese ATVs, go-karts, and dirt bikes, including 125cc Taotao Coolster models. It lists compatibility with PZ16, PZ19 and PZ20 carburetors. Dimensions are 35mm inside diameter, 82mm tall, and 74mm widest diameter. The filter aims to remove contaminants, deliver clean air, and support gains in power, torque, and engine life.
- Compatibility: Fits most 70cc–125cc Chinese ATVs, go-karts, and dirt bikes; PZ16/PZ19/PZ20 carburetors.
- Dimensions: Inside diameter 35mm; Height 82mm; Outside diameter 74mm.
- Performance: Improves air intake, power, torque, and engine longevity.
HIAORS 35mm Air Filter For 125cc Dirt Bikes
This 35mm air filter is crafted for a broad range of 125cc models and smaller, including Tao Tao, Coolster, Apollo, Baja SSR, Hond* variants, and more. It lists extensive compatibility across ATVs, go-karts, and dirt bikes. Carb compatibility includes PZ19 and PZ20 carburetors. The design filters impurities, reduces wear on internal parts, and supports a steadier fuel-air mixture and throttle response.
- Compatibility: 49cc–125cc Tao Tao Coolster Apollo Baja SSR Honda and more.
- Carb Fit: PZ19 and PZ20 carburetors.
- Function: Filters impurities, lowers wear, improves intake stability.
CIOM 35mm Air Filter For 125cc Dirt Bikes
CIOM’s 35mm filter targets 50cc–150cc Chinese ATVs and dirt bikes, including many Go Kart and mini bike setups. It supports PZ16, PZ19, and PZ20 carburetors and features dimensions of 35mm inside diameter, 82mm height, and 74mm widest outside diameter. The filter aims to trap dust and debris while maintaining optimal air-fuel ratio for reliable performance across 125cc platforms.
- Compatibility: 50cc–150cc Chinese ATVs and dirt bikes; PZ16/PZ19/PZ20.
- Dimensions: 35mm inside; 82mm tall; 74mm widest diameter.
- Benefit: Cleaner air reduces wear and helps sustain engine performance.
LCGLY 42mm Universal Air Filter For GY6 125cc
LCGLY’s two-pack offers a 42mm universal air filter designed for GY6-based engines common in 125cc–250cc scooters and dirt bikes. It’s compatible with Kawasaki, Suzuki, Yamaha, and other brands using PZ24 and PZ30 carburetors. The filters are described as 100% new material with good filtration. Main benefits include reducing intake of impurities, helping balance the fuel-air ratio, and diminishing intake noise.
- Package: 2 x air filters.
- Compatibility: GY6 family; 125cc–250cc engines; PZ24/PZ30 carbs.
- Function: Filtration, fuel-air balance, noise reduction.
EOPOAYI 35mm (1-3/8″) Air Filter For 125cc Dirt Bikes
This 35mm air filter is compatible with Taotao Coolster 110cc–125cc and other 50cc–150cc Chinese pit bike/ATV models, including various 4-stroke engines. It lists PZ19 and PZ20 carb compatibility and covers a broad range of Chinese brands such as ATA-110/125, Coolster 110, Roketa, Baja, and more. A gas petcock valve is included in some listings, adding convenience for certain setups.
- Fitment: 35mm; works with PZ19/PZ20 carbs and many 50cc–150cc engines.
- Compatibility: Taotao Coolster, Baja, Apollo, Roketa, and others.
- Includes: Gas petcock valve in select configurations.
Buying Guide
Key purchase considerations
Compatibility is the primary factor when selecting an air filter for a 125cc dirt bike. Most 125cc models use 35mm intake housings, but some scooters and compact bikes rely on 42mm filters. Confirm your carb size (PZ16, PZ19, PZ20, PZ24, PZ30) before purchasing. Also verify the engine family you own, such as Tao Tao, Coolster, or Roketa, since compatibility varies by model.
Filtration quality and airflow balance are crucial. A high-flow filter is beneficial, but it must seal properly to prevent unfiltered air from bypassing the element. Look for a design with a robust seal and a washable filtration medium. The best filters maintain filtration efficiency while offering adequate airflow to support throttle response and power delivery.
Durability and maintenance drive long-term value. Filters built with sturdy housings and reliable foam or synthetic media tend to last longer under dust-heavy riding conditions. Consider foam or layered media that can be cleaned and reused, reducing ongoing replacement costs while preserving peak performance.
Fitment and performance considerations
When choosing between 35mm and 42mm options, verify the carburetor inlet size and airbox compatibility. Some 125cc dirt bikes use 35mm filters, while scooters with larger intake manifolds may favor 42mm units. If you ride in dusty environments, a filter with a thicker media and better sealing will help protect the intake. For owners upgrading from stock, ensure the new filter’s outer diameter fits within the airbox opening without forcing a tight seal.
Maintenance and replacement guidance
Regular cleaning extends filter life and maintains performance. Clean reusable foams with appropriate solvents and reassemble with dry media. Replace disposable filters according to manufacturer guidance or after extended exposure to heavy dust. Inspect the surrounding clamps, seals, and mounting surfaces for signs of cracking or wear and replace as needed to preserve proper sealing and airflow.
Brand reliability and availability
Choosing established brands with clear compatibility lists helps avoid misfits and airflow losses. Availability on major marketplaces ensures easier replacements and less downtime. Compare warranty terms where available and review user feedback for real-world performance, especially under rugged riding conditions typical of 125cc dirt bikes.