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641EC Premium Air Filter Made in the USA fits 2.5 Filter Adaptors
641EC Premium Air Filter - Blue
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641EC Premium Air Filter Made in the USA fits 2.5 Filter Adaptors

Part Number: 641EC
Online Price: $35.99
Premium 2.5" Washable Racing Air Filter for Go-Karts & Mini Bikes – ISO 5011 | USA-Made
Availability: Out of Stock.

Description

Premium Washable Racing Air Filter – Fits 2.5" Filter Adapters for Go-Karts & Mini Bikes


Protect your engine and boost performance with our Premium Washable Air Filter, built in the USA and engineered for serious racers running 2.5" (63.5mm) filter adapters—including Tillotson HL-style and other high-flow carburetors found in go-karts, mini bikes, and small engine platforms.


Crafted to meet ISO 5011 filtration standards and backed by over 30 years of motorsports engineering, this high-performance air filter features deep, wide pleats for expanded surface area, allowing maximum airflow while effectively trapping fine dust, sand, and debris.


Built for Racing – Designed for Real-World Conditions

  • Washable & Reusable – Long-lasting performance with easy maintenance
  • Improved Filtration + Airflow – Deep pleats capture more particles while maintaining high-velocity intake
  • Stabilizes Air/Fuel Ratios – Helps maintain consistent tuning by cooling incoming air
  • Engine-Safe in Harsh Conditions – Recommended for dusty, sandy, or off-road race environments
  • Outperforms cheap, off-shore filters with superior materials and US-built reliability

Whether you're tuning for performance or protecting your investment, this is the filter your build deserves.


Key Features:

  • Made in the USA – Reliable construction with race-tested performance
  • ISO 5011 Certified – Proven air filtration standards
  • Tapered Cone Design – Optimizes airflow in tight engine bays
  • Reusable Design – Wash and reuse for multiple seasons


Specifications:

  • Fits: 2.5" (63.5mm) Filter Adapters
  • Top Width: 3"
  • Bottom Width: 4"
  • Element Length: 5"
  • Overall Length: 6"
  • Shape: Tapered cone

FAQ

Q1: What filter adapters is this air filter compatible with?

A: This air filter fits any 2.5" (63.5mm) air inlet or filter adapter, including popular setups like Tillotson HL-style carbs and other clone or high-performance small engine intakes used in go-karts and mini bikes.


Q2: Is the filter washable and reusable?

A: Yes, it’s a fully washable and reusable filter, designed for long-term use. Simply clean, dry, and reinstall for consistent high performance and cost savings over time.


Q3: Will this improve engine performance?

A: Yes. Its tapered design and deep pleated media allow increased airflow while reducing intake temps, helping your engine maintain optimal air/fuel ratios for better throttle response and tuning stability.


Q4: How does this compare to cheaper off-shore filters?

A: Cheaper filters often restrict airflow or allow dust into your engine. Our USA-made, ISO 5011-certified filter offers superior filtration, airflow, and durability—especially in dusty, sandy, or off-road conditions.


Q5: What are the exact dimensions of the filter?

A:

  • Top Width: 3"
  • Bottom Width: 4"
  • Element Length: 5"
  • Overall Length: 6"
  • Shape: Tapered cone for high airflow and efficient fit

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