300ex jetting changes for removing airbox?

[DirtyGirl]

Just curious what experience people have with removing their airbox and changing the jetting. I'm running 128 on the main right now and have no mods.

[hondafox440]

Are you sure you want to remove the entire box and not just the lid? You would have to watch out for water without an airbox.

Anyways, I would try bumping the main up one size at first and see how it runs. You may benefit from moving the clip down one notch on the needle too.

[DirtyGirl]

Oops, sorry! I did mean just the lid. Thats what I get for typing a post after riding all day.

[dirtmomma]

Hey dirtygirl, well I don't run a lid on mine but I do have mods, now as for jetting I would take it off & then do a plug check to see what it looks like. Mine is still running rich I think, it's very finicky when it comes to jetting so when I find a decent spot I stay w/ it LOL I'm can't remember what size of jet I have in right off hand:rolleyes: I will have to go look sometime good luck I probably didn't answer anything LMAO!!

[DirtyGirl]

Already did a plug check with the lid off and I know its too lean. I'm just looking for a ballpark estimate on what size jet I should get.

[cals400ex]

i know you said you have a 128 in now, but what is the stock size main on a 300ex?
what is the temp outside?
what elevation you at?

[westcoastmxer]

welcome 2 exriders dirtgirl,try goin 2 sizes up on the main jet.y are u runnin a 128 main jet w/stock exhaust?that should be too rich but i dunno.:D

[gump]

have k&n full fmf and a 4 inch hole cut in the airbox with a outwear stapled over it and running a 130 main

[ZSK]

It depends on your elevation but with a K&N and no lid I was running a 128 MJ, clip 3rd from the bottom, and a 38 pilot. Ran good perfect color for me.

[Aceman]

You live right at sea level right? Stock MJ is 122. Since you did a plug check what color was it? If it was white, it could be the fuel you are running. Your plug should be black and wet because a 128 MJ is super rich. Have you messed with your needle clip or fuel screw at all? Also, I don't think your going to have a noticeable difference with the lid off considering you have no pipe or filter mods.

[dirtmomma]

Hmmm well I think I just remembered what size of jet I was running I THINK it's a 118, I run a Dynajet kit in it, it still is rich but I hate going down anymore but i was thinking about it.

[Aceman]

I used to have a Dynojet kit in mine. Ran a 116 DJ with a KN and full FMF exhaust at sea level. My plug showed it was still rich though. But I might have been off on the fuel screw because that was before I knew how to do plug chops.