Post Pic

DRZ400 3×3 Air Box Mod

This mod is creating a 3 inch by 3 inch size hole in the that you will need to cut into the top of your airbox where your snorkel currently is.

The DRZ400 3×3 Air Box Mod

This mod is performed by creating a 3 inch by 3 inch size hole in the that you will need to cut into the top of your airbox where your snorkel currently is. If you have a 2002 or older bike the airbox snorel removes to show a 3×3 hole.

With this increase in air flow your carburetor will likely need to be re-jetted. Below are some sample jetting recommendations:

DRZ400 SM

– 150 main jet (155mj for full exhaust system)
– 25 pilot jet
– 2nd clip on needle from top
– 2.5 turns out on fuel screw

DRZ400 S

– 140 – 142.mj (bigger for exhaust)
– 25 pilot jet
– 4th position from top
– 2.5 to 3 turns out on fuel screw

This DRZ400 Mod increases your horsepower and throttle response. It is a free DRZ400 mod, the best kind!

Related posts:

  1. HOW TO: DR-Z400 FCR 39MX Carb Install How to upgrade the DRZ400 Stock Mikuni BSR36 Carb to...
  2. DEAL: DRZ400 Yoshimura RS-D4 Dual Exhaust System I just saw a DRZ400 with dual exhaust - it...

Related Posts

Popular Posts


2 Responses

06.17.10

this is awesome man

06.17.10

Hi , I have 2010 drz400 sm with a RS-4 carbon fibre pipes and have damaged RHS muffler do you sell individual ? How much to Perth , Western Australia ? Cheers Kym

Leave Your Response

* Name, Email, Comment are Required