What size jets?

[ATC350X 85]

When i get a used 400ex i want to go with the white bros e series s bend silencer. Also either a uni filter or some higher than stock air filter and maybe a different air box lid. If i go with just the pipe and filter what should i re-jet to? Also should i move the clip on the needle to richen it up? If i go with the pipe, filter and different air box lid what should i jet it at? I am in New Jersey at sea level. I am planning in advance to fit my tightwad budget at this time.

[muddy400EX]

ive got e-series and k&n filter on my 400ex and i checked with dynojet to get the right jetting. ive got 146 main jet and i changed to the dynojet needle and it runs great

[ATC350X 85]

Im not familiar with the dynojet needle. What are the differences from stock? Did you change the pilot jet as well and change the air/fuel screw setting? I am somewhat familiar with the 400ex carb, I have one on my atc 350x that i had to jet down cause it was too rich when i bought it, someone must have had it on a modded 400ex it had a 155 main in it!! I jetted to stock 350x at 138 and it runs mint!!

[tprender]

If you are on a tightwad budget, you don't need the dyno numbers. The stock will do just fine. Put the main jet at about 162 + or - one size and put the pilot jet at 42 to help with starting. Leave the needle alone. This should cost you lest than $10 to $15 total.

[muddy400EX]

i did not change the pilot or the air/fuel mixture. the dynojet needle dont look much different than stock but is does make a difference.

[ATC350X 85]

Cool, ill keep that in mind. I dont want to by one of those expensive jet kits. They tried selling me one of them at honda when i was rejetting the 400ex carb on my 350x. It was like $60 i think i spent maybe $10 on a 138 and a 140 and it runs great.

[muddy400EX]

if you are on a budget do what tprender said. i got the jets free with my quad.