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250EXpwns
03-10-2004, 07:59 PM
Ok, I have a little problem. I run a 155 main jet with my 400EX(see sig) right now. I want to run a 160 but the guy who owned it before me said it wouldn't run right with the 160 unless he took the airbox lid off. I was wondering, is there anything I can do to my airbox lid or anything else that will make it run the jet without degrading performance? Because I don't want to take the airbox lid off unless I absolutely have to. Thanks in advance.
250EXpwns
03-10-2004, 09:17 PM
Anyone?
riverex
03-10-2004, 09:20 PM
a 155 with lid on??? that sounds pretty rich already is this dyno jets or kelin. if dyno you should be running a 146 at most.
250EXpwns
03-10-2004, 09:40 PM
Did you look at my sig at the mods? The guy who sold it to me told me it had a 155 K&N in it. I pretty sure that's what it is because I have the 145 and it's not in the 400.
cals400ex
03-10-2004, 11:08 PM
your sig says 155 main jet. it doesn't specify keihin or dynojet. just because you run a K&N filter doesn't mean you run dynojets.
Bennyboy400ex
03-11-2004, 03:28 PM
You could drill holes in the lid, cut or remove the snorkel, or install a couple of TPI valves. They're $20 at www.thunderproducts.com (http://www.thunderproducts.com)
400EXrider77
03-11-2004, 03:40 PM
why do u want to jet up? is it running lean now? if its running fine now, adding a bigger jet will make it richer so u have to lean it out to counter it by increasing the air flow=taking your air box lid off.
250EXpwns
03-11-2004, 08:53 PM
Originally posted by Bennyboy400ex
You could drill holes in the lid, cut or remove the snorkel, or install a couple of TPI valves. They're $20 at www.thunderproducts.com (http://www.thunderproducts.com)
Ok that's what I was looking for!!! Thank you very much. Those TPI valves look pretty slick. Might get some of those. BTW, I use DYNOJETS!!! I thought I already said that but I guess not.
James Parent
03-11-2004, 09:55 PM
Take a look at this
http://www.exriders.com/vbb/showthread.php?s=&threadid=50212&highlight=EHS%2A
and this
http://www.exriders.com/vbb/showthread.php?s=&threadid=88510&highlight=airbox+lid%2A
I'm sure that will help you a lot

I ordered the kit from outerwears for 49$.. sure it was a little more than doing it yourself but it looks cool! and prob comes with stickers yesss!! ha j/k but check those out
good luck
james