i just took the air box off my 450 and just put straight filter but i need to know wat kinda jets or wat to adjust on the carb cuz it turns on but i know its getting to much air and im use the stock boot

Welcome to the site, this is kind of a tough question without knowing other mods.

Aftermarket pipe? Have you touched the jetting at all? Is this a gen 1, or 06 and up?

This will help answer some. whats the elevation or where are you located?

well i got a curtis sparks pipe, stage two hot cams, stock bore and i havent touched any yet just wanted to see if anyone can help lil before i mess with it . i was gonna move the needle up more and see if that will help give more gas

With more air, you probably will be lean on fuel. Go a couple sizes larger on the main, go for a ride.

170-180 main for 04-05. I believe something like a 155-165 main for an '06 and up. Keep the needle in the same position, change the main, ride it. Then may need to play with needle position.

i have a 190 main jet already so thats y i was thinking of moving the needle up and see how it works wat about the fuel and air screw

What year, what carb?

its a 04 and but i dont have a fcr carb just stock

190 main is probably too fat. To be safe I'd go with a 180, start with needle in the stock position, stock 48 pilot, a/f screw 2.5 turns out. You should order an HRC needle if you don't have one, that would work better than stock. If you have any problems post up the symptoms.

Agreed... Moved to ENGINE section.

X3...

except I might start with 185 MJ and toss in a #50 slow jet.....but close enough