Folks I have a 04 Yahama Yfz 450, on this I have a White Brothers exhaust, White Brothers air filter with stock air box. I no it needs jetting im sure just because it has a bog when you hold it open quickly.Im wondering what size jets and how many jets will I need to buy. Im not to sure where you can buy single jets so if anyone no's where please let me no. Thanks

 

you can go to the yamaha dealer and buy factory jets. they are like $2. go to the yamaha page and post this, i cant remember stock jetting.or you can ask the yamaha dealership and they should get you close, id buy 3-4 diffrent sizes. you shouldnt have to mess with the pilot or needle . sounds like you need to go up maybe 2 sizes on your main.