[Michael4375]

I’m new on here I have an 02 trx400ex with a big bore 440 kit and need help getting my carb getter right

 

[Goober]

That could be a tough one Idk sport quads.

How is your quad running? Backfire? Black smoke?

Is it an OE carb? Did you rejet it?

Is the quad using OE airbox?

Tell us more

 

[rednyforeman500]

Hi and Welcome to the forums!!

 

[SlammedRanger]

Welcome to the forums! Goober is right on the money. We need to know any and all modifications done. Anything that brings more air in or gets more air out of the engine. Without that info there is no way to tell you where to even start with your jetting.