Unifilter Air Filter for KTM 620 LC4 Electric Start (1997-1999)

Unifilter Air Filter for KTM 620 LC4 Electric Start is a professional two-stage filter for the serious Enduro rider & “Weekend Warrior”.

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Unifilter for KTM 620 LC4 Electric Start (1997-1999)


Professional two-stage filter for the serious Enduro rider & “Weekend Warrior”

  • Two individual filters in one
  • Unique Sawtooth outer work stage for increased surface area
  • Layer can be separated for easy cleaning
  • Improved air flow
  • Improved power
  • Improved protection
  • Fully reusable high performance race filters (Single Stage) for SX, MX, Supermotorrad & Freestyle
  • Unique Sawtooth design for increased surface area
  • Improved airflow - More power
  • Improved throttle response
  • Improved cage sealing – “Ultra Soft Seal” technology
  • Supplied dry – require oiling before use


The world's best dirt bike filters!

Why use Unifilter "ProComp2" two stage air filters in your dirt bike?

Unifilter "ProComp2" two stage air filters are the only proper 2 stage air filters on the market. ProComp2 air filters are two filters in one. All other brands are bonded twin layer filters made by laminating a fine and coarse layers of foam together. The laminating process reduces air flow so to improve air flow the outer layer is made using a coarse grade of foam. This in turn reduces the filtration quality of the filter.

The two layers of foam used to make a ProComp2 dirt bike filter are both fine. This in turn give your bike the best air flow and filtration possible. The two layers can be separated for cleaning. You will not get dust and sand caught between the layers. As you can see from the pictures the outer layer does all the work and the inner layer is a safety stage.

Added to this Unifilter uses 'Ultra Soft" foam seals on the base of the filter. This makes for the perfect seal between the filter cage and air box. Some air filter brands use a rubber seal on the base of their filters. This may work well on a car filter but when dust is involved it can allow for dust to pass if the filter is not seated correctly or the air box plastic warps due to the heat of the engine. Foam seals will compensate for this as they mold better to any imperfection.

When selecting your air filter for your dirt bike you should always select a good quality foam air filter oil. You are best to use a Mineral Based foam filter oil. Mineral Based oils will not dry out like synthetic foam filter oils in extreme dusty conditions. Unifilter "Filter Fix" is a mineral based filter oil that we have developed over the last 30 years. We have not found a better oil for use in Australia's harsh conditions. Always avoid using filter oils that come in metal containers and spray cans. These oils can have an adverse effect on the foam and glues used to make air filters.


How Unifilter Air Filters Work

To duplicate the world’s best air filter - the human nose - Unifilter uses open cell, polyurethane foam to achieve the high level of efficiency required by today’s high quality engineered engines.

The open cell polyurethane foam provides excellent air flow and - combined with foam filter treatment - the best filtration obtainable in any automotive air filter. Add to this the fully-reusable factor of polyurethane foam and you have the best air filter money can buy.








As a base rating

30 ?m



Oiled Paper

2% more restrictive

18 ?m



Cotton Gauze*

25% less restrictive

45 ?m



Unifilter Foam

24% less restrictive

4 ?m



*NOTE - The world’s leading manufacturer of cotton gauze filters recommends oiled foam outers when used in dusty conditions.



About UniFilter:

UniFilter are the manufacturers of performance motorcycle air filters for dirt, ATV, Harley and vintage motorcycles

View more UniFilter products



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