LTZ Jetting?

[leadfoot_52]

My buddy has an 06 LTZ 400 and was going to take off the airbox lid tomorrow and install the full yoshimura system. any Ideas what I should change the main jet to?

[ltz400yo]

I just put yoshi full system & K&N filter I put a 145 on the main with the lid off ran good but some backfiring moving up to 150 main and 1 turn out on air pilot I'll let you know how that works out! but 145 main should be good for you. Dont for get to take the lid off.:D

[hang1p]

i'm a little late here but somwhere around 155 to 165 mukuni main jet pending elevation and location