bogs in second gear

[jcs327]

I just drilled the airbox on my all stock 400ex. I noticed that when I come off the line in second, it bogs before picking up and going. I lowered the clip on the needle one notch, but it did not change. I am still running the stock filter, but I am soon going to a K&N. What should I do to get rid of the bog? Go to a 152 main jet? Thanks in advance.

[AtvMxRider]

You need to rejet cause you are running lean.

[AtvMxRider]

Oh yeah welcome to the site .

[1fast400ex]

could you come out in 2nd before u drilled the holes

[jcs327]

do you think a 152 will do the trick?

[AtvMxRider]

Originally posted by jcs327
do you think a 152 will do the trick?

it's a start. Nobody can tell ya exactly what your jetting will be caus eit's more of a trial and error. But a 152 might do it for ya.

[jcs327]

it bogged before I drilled the box. I figured drilling the box would help, and it did a little. I noticed the plug was a little white, so I moved the needle clip down one notch. Once the rpm's pick up, it rocks. Its just taking off in second that bogs it.

[1fast400ex]

why not just go with a 14 tooth front sprocket and forget jetting theres no need to rejet for holes in the lid or even with a k&n. that is if your wanting to come out in second easily

[AtvMxRider]

Originally posted by 1fast400ex
why not just go with a 14 tooth front sprocket and forget jetting theres no need to rejet for holes in the lid or even with a k&n. that is if your wanting to come out in second easily

Your increasing the air flow into the engine. Why wouldn't you rejet?

[1fast400ex]

with just drilling air holes your not letting that much more air in try taking the lid off and checking the plug u wont notice much difference. he stated that he was still running the stock pipe and stock filter. without a pipe he not going to get the air out. all i was saying is he can gain alot more bottom without rejetting.