airbox

[250xrider909]

hey guys if i take my airbox lid off or vent it will that improve my power noticebly?? then adjust the airflow screw...i have a white bros pipe with k/n airfilter and jet kit and im trying for some more power..anyone else got any other ideas on what i can do to make more power???
thanskss

[LazeR]

If you take the lid off you will notice a difference.....its nothing huge but you do notice it! You also may need to rejet if you take off your lid

[cals400ex]

the air box lid can help a little bit. some claim it helps a ton. i don't believe that crap, but that is just me. i am no quicker with the air box lid on or off (given i am jetted correctly either way) when drag racing. the key is going to get your bike jetted right.

if you take the lid off, you will need to change the mainjet. well, that is considering your jetting is good now. messing the fuel screw may need to be done too.