got to keep you guys updated! haha, here is the update on my 400ex. i added an hmf ballance pro series slip on and a 450r carb with ZRPilot adapter. runs a 195 main, 52 pilot, a/f screw 5 turns out (needs a bigger main jet, but until then it runs mint, no more popping on decel). tell me what you guys think!
2003 honda 400ex update - YouTube
2003 honda 400ex update - YouTube