450r carb/on 400ex

[Smithykid14]

I know this Question has been beat to death but is the modd worth the time/money to install this modd and if it is how difficult is it to do? Thanks guys.

[fmftrx300ex]

fcr's are the pickiest carbs iv ever delt with and it depends what other mods oyu have piston porting exhaust intake all of that plays a huge rool in the gains you'll see