Twin Air Parts

Explore all factory and aftermarket dirt bike products directly engineered by Twin Air.

Technical Authority Guide Brand Engineering & Heritage Guide

Twin Air — The World Standard in Dual-Stage Foam Filtration

### Brand Heritage & Five Decades of Engine Protection Founded in 1972 in Veghel, The Netherlands, Twin Air was born to solve a catastrophic problem in off-road racing: paper air filters that clogged with dirt and single-layer foam filters that allowed abrasive sand and dust to enter the combustion chamber, destroying pistons and cylinder walls. Twin Air invented the world's first dual-stage, flame-laminated polyurethane foam air filter—a breakthrough that revolutionized engine protection forever.

Over the past fifty years, Twin Air has won more World Motocross and AMA Championships than all other air filter brands combined. Today, Twin Air is the official OEM filter supplier to over thirty motorcycle manufacturers worldwide, including KTM, Husqvarna, GASGAS, Yamaha, Honda, and Kawasaki. Operating from ultra-modern facilities in the Netherlands, Twin Air continues to lead the industry in foam lamination technology, airbox flow dynamics, and biological filter cleaning chemistries.

  • Dual-Stage Replacement Air Filters: Patented flame-laminated 45-pore outer and 65-pore inner reticulated foam filters with thick greaseless sealing rings (including high-demand 2-stage air filters / two-stage air filters).
  • Powerflow Throttle Body & Airbox Kits: CNC billet aluminum filter cages and oversized flame-retardant filters that eliminate restrictive OEM backfire screens.
  • Pre-Oiled Factory Dual-Stage Filters: Ready-to-install air filters pre-saturated with Twin Air Liquid Power oil on automated vacuum oiling machines.
  • Dust Covers & Sand Net Pre-Filters: Coarse foam and nylon mesh pre-filter covers for extreme sand dunes and muddy conditions.
  • Bio Filter Cleaner & Liquid Power Oil: Biodegradable foam filter oils, washing tubs, sealing grease, and airbox wash covers.

### How Twin Air Filters Outperform Generic & Glued Filters 1. Thermal Flame Lamination: Generic foam filters use chemical glue to bond foam sheets together, creating a solid glue barrier that restricts airflow and dissolves in cleaning solvents. Twin Air uses heat-fused flame lamination, fusing the foam cells thermally for 100% unrestricted airflow. 2. Dual-Stage Reticulated Matrix: The coarse 45-pore outer layer captures large dirt, sand, and roost particles, while the fine 65-pore inner layer traps microscopic dust down to 5 microns, protecting intake valves and cylinder bores. 3. Thick Greaseless Sealing Base: Twin Air's flat, high-density foam base ring forms an airtight, leak-proof seal against the airbox flange without requiring messy filter grease.

### Polyurethane Reticulation Chemistry Twin Air filters utilize open-cell reticulated polyurethane foam created through a specialized thermal reticulation process. An electric spark ignites a combustible gas mixture inside the raw foam block, melting away the microscopic cell window membranes and leaving behind a pure 3D skeletal network of open pores that maximizes air velocity while trapping dust.

  • Oiling Method: Submerge the filter in Twin Air Liquid Power oil, squeeze out excess oil thoroughly (never wring or twist, which tears foam seams), and allow the solvent to evaporate for 15-30 minutes until the foam is uniformly tacky.
  • Cleaning Procedure: Clean dirty filters using Twin Air Bio Filter Cleaner, rinse in warm water, and dry completely before re-oiling. Never wash foam filters with gasoline or harsh solvents.
  • Airbox Wash Covers: Always install a rigid plastic Twin Air airbox wash cover when washing your motorcycle to prevent water from entering the intake tract.
  • Filter Sealing Check: Run your finger around the perimeter of the airbox sealing ring after clamping the filter cage to verify zero gaps or misalignment.

Frequently Asked Questions

Q: Why is flame lamination superior to glued foam filters?

A: Flame lamination fuses the foam layers using controlled heat without glue, creating a continuous open-cell airway that maximizes airflow and never dissolves in cleaning solvents.

Q: How often should I clean and re-oil my air filter?

A: In dry, dusty, or sandy conditions, clean and re-oil your air filter after every single ride. In wet or loam conditions, inspect after every ride and clean when the outer layer is dirty.

Q: Is it safe to eliminate the metal backfire screen with a Powerflow kit?

A: Yes. Twin Air Powerflow filters incorporate a specialized flame-retardant inner foam layer that prevents backfire sparks from igniting the filter, eliminating the need for a restrictive metal screen.

Q: What happens if I use gasoline to clean a foam filter?

A: Gasoline dissolves the seam adhesives, breaks down the cellular polyurethane foam structure, and causes the foam to harden and tear, allowing dirt to bypass into the engine.