Air filter help

karthead · Trackday Trickster Joined: 01 Apr 2012 Karma :

Hi all,
I have a question about using a cone filter for a KE125. The original 'air filter' (which was actually a big chunky air box thing) is damaged and i cant be bothered getting a new one. I'm thinking of putting a cone filter, either straight onto the carb, or where the airbox connected to (a big hole kinda thing in between the clutch cover and carby cover). I've had so many different opinions about this, i dont want to take a wrong step.

Anyway, straight to the point. I dont have the knowledge (as a lot of you know) to do things to the carby in order for it to function properly (like upjet or whatever). I want to install the cone air filter without having to replace anything else. If i have to, ill adjust the air screw to the right setting. I'm so confused at the moment

Cheers

wilz1234 · Trackday Trickster Joined: 14 Jul 2010 Karma :

From what I am aware of, changing your air filter to the cone type can change your mixture, and the carb may have to be adjusted to suit. Personally I see it that on a 125 there is a tiny power gain (if you're lucky) from changing to a cone filter, which isn't really worth the effort of getting the mixture right. If you can, I would repair the airbox.
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karthead · Trackday Trickster Joined: 01 Apr 2012 Karma :

wilz1234 · Trackday Trickster Joined: 14 Jul 2010 Karma :

I'm not very knowledgeable of 4 stroke intake tuning. I know it is the case that for a 2 stroke, when putting a cone filter on it can cause the engine to run lean, and therefore require upjetting.

I would imagine that a 4 stroke would be a lot more forgiving with a cone filter and would probably run fine. Perhaps have a look into what the colour of you're spark plug can mean. You should be looking for a nice mid-brown colour on the ceramic part surrounding the electrode inside the cylinder. Darker than this suggests the mixture is too rich, and a white-ish electrode with an eroded looking tip can suggest the mixtures too lean.

I'm sure there will some 4 stroke tuning guru's on here who can give better advice
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Casper · World Chat Champion Joined: 12 Jul 2010 Karma :

By the time you have fucked about trying different jets and buying the cone you would be better getting a 2nd hand air box. If you are after more BHP then get a bigger bike.

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

Matt B · World Chat Champion Joined: 01 May 2012 Karma :

You would need to go up one size on the main jet then take the bike for a run and pop out the plug to check the mix.

If you don't know how to do this on your own then replace the airbox!
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Mikey3 · World Chat Champion Joined: 04 Nov 2011 Karma :

I swear this exact conversation has already been had, with the same answers given..... Thinking

Mike
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linchun38 · L Plate Warrior Joined: 05 May 2012 Karma :

Darker than this suggests the mixture is too rich, and a white-ish electrode with an eroded looking tip can suggest the mixtures too lean.
https://www.filii.info/hh.gif

karthead · Trackday Trickster Joined: 01 Apr 2012 Karma :

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wilz1234 · Trackday Trickster Joined: 14 Jul 2010 Karma :

Choke idea seems like it would work, but it a lot more hassle than changing jets.

You'll probably find that the carb is made by a well known make, and parts like jets will be readily available.

Am i right in thinking this is actually a 2 stroke?
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karthead · Trackday Trickster Joined: 01 Apr 2012 Karma :

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lihp · World Chat Champion Joined: 22 Sep 2010 Karma :

just change the bloody jet!

if the engine is out, it will take 1 min to remove carb, and 2 mins to replace jet.

Sticking a pin in, will open it up, but you will have to remove the jet to do it, or you'll get brass in the jet and block it.

If you're removing it, instead of guessing how much to force it open, then just fit a different size!

79 to 81 they sell jets
https://www.wemoto.com/bikes/kawasaki/ke_125_a7-a8/79-81/

76-78 they're here
https://www.wemoto.com/bikes/kawasaki/ke_125_a4-a6/76-78/