Adding Twin Air BIO Dirt Remover to Twin Air Cleaning Tub
Washing Twin Air BIO Filter in clean water
Squeezing excess oil out of BIO Filter

1. Soak the filter

Put three liters of tap water, as hot as possible in the special purpose designed cleaning tub. Add 100ml of Bio Dirt Remover to the water (One filter needs 100ml of Bio Dirt Remover)

Soaking Twin Air BIO Filter in Cleaning Tub

Fully immerse the dirty filter (wear
protective or disposable gloves and be careful not to burn your hands), and let it soak for ten to fifteen minutes.

Washing Twin Air BIO Filter in BIO Dirt Remover

2. Squeeze the filter

Squeeze the filter several times (do not wring!), repeat this procedure until all the dirt has disapeared.

Squeezing excess BIO Dirt Remover out of BIO filter

3. Wash the filter

Wash the filter with clean, cold tap water
until all the soap residue has been removed. Leave the filter out to dry, under a piece of cloth. Once the filter is dry, it is ready to be pre-oiled again.

Drying Twin Air BIO Filter

TIP: Oiling the filter without allowing it to dry sufficiently will trap some of the moisture.

Oiling clean Twin Air BIO Filter with BIO Liquid Power Filter Oil

4. Oil the filter

Soak filter in BIO Liquid Power Filter Oil, making sure to saturate the entire filter, coating the filter uniformly. Be sure to apply oil to the inside and outside of the filter.

TIP: Don't oil your air filter right before riding. Preoil the filter at least 24 hrs before riding to allow the oil to evenly penetrate the pores and allow the thinning agent to evaporate. A recently oiled filter will cause rich conditions.

5. Squeeze excess

Squeeze excess oil out of the filter so that a light coat of oil remains. Continue to massage until the filter is evenly coated.

Drying the cleaned and oiled Twin Air BIO filter
Installing filter cage inside clean and oiled filter

7. Install the filter

Install the cage into the filter and install filter into airbox. Before installing check carburetor boot for dirt.

6. Dry the filter

Leave the filter out to dry in a well-ventilated area, preferably outside in the open air under a piece of cloth. After approximately 2 hours, the filter is ready to be used. Store pre-oiled filters in the resealable Twin Air bag (or an airtight plastic bag) and in a dark spot.


Cleaning air filter cage and bolt

Clean air filter cage and bolt

Using contact cleaner, spray the filter cage and bolt to remove old oil and dirt.

Cleaning sealing ring

Clean sealing ring

Spray contact cleaner on a rag or towel and wipe the sealing ring of the airbox to remove dirt and oil residue. Look inside the airboot to make sure no dirt fell into the boot when you removed the filter.

Installing Twin Air Airbox Cover

Airbox cleaning

Install your Twin Air Airbox Cover before you wash your bike or ATV. With the Airbox Cover installed, you can wash out your airbox without getting dirt or water into your airboot.