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    • #1988
      • Topics: 9
      • Replies: 17

      is it pointless fitting one of theses K&N Racing Air Filter for gt125r


      im guessing there wont be much difference between stock

    • #1991
      ♠️ MARCEL
      • Topics: 45
      • Replies: 1,880
      North UK

      A stock filter has a cone inside and the material is different = restricted.
      Also it’s a bit smaller than K&N –

      K&N can push 3x more air  = cotton filter in oil coating – so cleaner bike & more free revving yes.  “650 specific”   K&N is good   otherwise  , BMC Italy does it too  (known for race filters on aprillias) – I owned some BMCs in some of my bikes , some K&Ns – they do the justice

      However – an upjet is mandatory  (hence carb tutorial on the forum goes in better detail on jet swapping – just search “carb” at the top of site.

      Running 3x more air on the same stock jets = engine is much hotter , misfires , new piston rings soon lol.

      Likewise, if you have a performance exhaust pipe  –> more gases going out –> upjet is mandatory

      Any air upgrades basically (intake or exhaust) = upjet

      // Meditation doesn't mean you have to sit still....

    • #2299
      Adrian Newnham
      • Topics: 0
      • Replies: 1
      Blandford, Dorset
      GT 650 Comet

      K&N filters are cleanable and have a 1 million mile warranty. The 650 one was £54 and the standard one was £34 which needs replacing every service. It’s well worth buying a K&N as you won’t need to buy another one ever. The fact it adds a little power and helps with fuelling is a bonus.


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