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kennyo1
03-15-2009, 07:37 PM
I have a 2005 400ex. Curtis sparks X4 pipe 38/155 jets K&N filterand rev box. I am considering removing the air box lid or installing an outerwears lid cover and removing the choke. Will I need to re jet? Right now it runs great, pulls hard and idles well. I would like a little more power but do not want to go into the engine. Is the choke removal and losing the lid worth it?
trailrider894
03-15-2009, 07:44 PM
yes you will have to re-jet and is it worth it?? well idk how noticeable it will be but i would say you should do it!!
the Z Man
03-15-2009, 08:31 PM
Jetting is very easy.....
kennyo1
03-16-2009, 03:10 PM
I know that jetting is easy, but if the gains are not noticable...Is it worth it? Right now it runs great. I am not sure if I want to go through the experiment process of finding the correct jetting if I will not see a gain in power.
Has anyone removed an airbox lid and removed a choke after exhaust and jetting???
the Z Man
03-16-2009, 04:06 PM
If I were you I would leave the choke alone, its nice for warm ups and cold weather, the jetting would be a big difference, I would start with a 155 main and go from there..
dariusld
03-16-2009, 04:36 PM
It would help if we new what jetting you are at now. You might not have to rejet if your running a little rich already.
Gibson
03-16-2009, 04:42 PM
Originally posted by kennyo1

Has anyone removed an airbox lid and removed a choke after exhaust and jetting???

i've done it and i felt a big gain in power.
kennyo1
03-17-2009, 06:47 AM
I currently have a 38 pilot and 155 main.
bigbad400
03-17-2009, 07:41 AM
i did both and def. noticed it. i would start with a 42 pilot to make it easy to start, then mess with you main cuz i didnt need to. mine has good pull all through and i love it, that choke is very restrictive. if you do the lid i would get both pre filters. the box lid is good but never will you have a problem if you get the one for the filter too. i removed and plugged off my snorkle tube too, also very restrictive. (not if you remove the lid then its just annoying and ugly)
dariusld
03-17-2009, 11:12 AM
Have you ran with the lid off already? If not I would see how it runs without rejetting. The lid is going to be the one the makes the biggest difference, not so much the choke removal.
kennyo1
03-17-2009, 03:32 PM
I guess it will make more sense to do a test run without the lid. What will be the signs if I am running too lean???
the Z Man
03-17-2009, 04:19 PM
May not want to hit the rev limiter, not a lot of power.... just don't rev like it should.
You will know when its right.