hello forum i would like to dump the air box on my 88lt250r. going with a k/n clamp on. anyway how many jet sizes do i need to go up.. any ideas would realy be of help oh yea the carb is a mikuni tm34ss flatslide.. thanks agian

 

try going up two, do a run, check your plug and make adjustments accordingly,
basically the same thing you would do when the weather gets cold.