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Hey guys, i have a question, I want to run my 250 without the airbox lid, but i was wondering you you need any certain jetting for this? anyone know?
 

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You dont need to change the jet sizes for an open airbox. The only thing i would suggest doing is drilling out the fuel screw and turning it out to about 1 3/4 turns, to keep the bike from running too lean at idle and low RPMs... Fuel screw location is shown at: http://www.dynojet.com/pdf/Q435.pdf
 

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okay i have a correction...

You should not run your bike without the air lid, unless you have a pre-filter on your k&n, and everything is oiled really well...

Yes you do need to rejet, one size up on the jets. but you do need to drill out the fuel screw as well...

What size jets are you running right now?
 
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