stock jet

[Bdav450]

does anbody know what the size of the stock jet is in a 08 yfz450 and i also live in louisiana and we are below sea level so would my new jet be about two sizes bigger

[ae13291]

it should be a 42 pilot jet. thats what my 04 had and my buddys 07 yfz had. and the main jet should be a 158 hex style main jets and 21 series pilot jets

[Bdav450]

thanks man

[yfzrider690]

He's right on the 42 pilot but the stock main is a 155.