ok well here the problem my carberateer over flowed and spilled gas into my airbox and ruined my uni filter so i replaced it with a k&N and i had a 150 jet in and the thing idols soo fast with it in i can put it in gear without touhing my throttle but i ran fine with my uni soo i tried jumping to a 155 and now it wont idol at all so im stumped do u guys have any idea of what the problem might be??????would my comprestion effect this?

 

How did your carb overflow?
What mods to you have on the bike?
Too much information is better than too little.

 

it over flowed becuase i guess my float pin got stuch and wouldent alow it to move open and close but ounce i adjusted that it didnt leak anymore and i drained my air box and put the k&n in and no its running really wierd....i have a yoshimura slip on k&n filter rejets and removed air box lid

 

Try turning your idle screw down and see if it helps it turn it down just enough to where you can slam the trottle and it pick up and not stumble, One of those filters is gonna flow more than the other, it has to because if your gas air mix has been changed to solve the problem with the uni then it has to be tweaked to the k&n. If i remember right, on idle if it has more gas it will idle up higher but will not have the same power and run kinda crappy, so i would say what happened is the uni being foam flowed more and now you air fuel mixture is off on your carb.

 

More air means more power but its safe to look at the micron size the filter is capable of trapping, so you dont let trash and dirt into toe carb and cylinder.