question on k&n filters

[Scorpius]

I have a Cagiva Mito 125 and am thinking of upgrading the air filter to a k&n. Now I'm just wondering, if I upgrade from the standard will I have to adjust anything on the bike? Im asking because a mate told me i'd have to adjust the jetting or it would cut out if I did that! But another person i've spoke to has told me I wouldnt have to change anything else when putting a k&n in so im confused!

[Black Knight]

The bike will run fine without jetting. Airflow will be increased but certainly not enough to cut the engine.

You could have it jetted for optimum performance or economy but to be honest the cost doesn't warrant the return.

Rick.
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Where does a turn end? 'Where you can do anything with the gas you want to, where you are brave again, where your attention is free from the turn, where you are sure you can do it better next time; that's the end' - Keith Code.

[luigi]

Hi, Scorpius

Accordingly with Black Knight, i would adding a simple way to keep under control your engine.
It is the same way used by the 125cc Grand Prix rider in Worldwide Championships to check the last controls before a race.

-Choose a road (better if you make this on a track) where you can keep the gas wide open for 15/20 seconds at least WITHOUT ANY RISK FOR YOUR LIFE

-After this time close completely the gas, pull the clutch and shut off the engine.

-Stop the bike, with engine shut off keeping always the clutch pulled, using only the brake

-Once stopped check the spark plug; the insulator of the electrode must be coloured of a light brown for a correct air/fuel ratio.

- If darker the engine don't have risks but can give more power.

- If clearer the situation is dangerous FOR YOU AND YOUR ENGINE that need a jet increasing.

-MORE THE COLOUR, FROM LIGHT BROWN ARE NEAR TO WHITE,
MORE THE JET INCREASING ARE URGENT AND THE SITUATION ARE DANGEROUS.

Remember that results are affected by the air temperature, the kind of spark plug, the rider weight and the Octane Number of the gasoline used .
Anyway, if you have changed only the air filter, this system can let you sleep sufficiently quiet dreams.

Ciao,Luigi

[veeeffarr]

[Scorpius]

Cheers Black Knight and Luigi esp. Thats good info you got there will give it a go.

[Kickstart]

Hi

There is a fair chance that just sticking on a K&N individual filter would cause it to run lean, and 2 strokes often react to running lean by seizing.

The description above of how to do a plug chop is good, and well worth trying. However probably worth increasing the main jet size a bit and working down from there (a few main jets are cheap, but a new piston and replating the barrel isn't cheap).

Safest to have the jetting slightly on the rich side, otherwise you might be fine until the weather changes.

All the best

Keith
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[bidman]

[bish777]

i dont think it would be that drastic for a replacement filter, but raising the needle by one clip would probably do the trick and be safe to prevent seizing.
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[Kickstart]

[bidman]

fair enouigh
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[Flip]

I haven't read the entire thread but it does advise on the K&N site not to rejet just use their filters.

[sickpup]