can anyone help my tune the jets on my 400ex? it doesnt wanna turn on. i need to know how to set my jets to how the carb is suppse to be origionally. pleasee help me

 

my 07 400ex had 148 main 38 pilot now has 155 main 42 pilot hmf slip on carb spacer air box holes

 

Tell us what you mean by "Doesn't want to turn on".

 

i just inbstalled a high performance clutch in my 400ex. and when i rode it the torke was weak, it actually had no tork at all. it was driving like a slow warrior. so they told me i had to tune the jets right.. i messed with them and now it wont turn on at all. can you help me with the right tuning for each screw in the carb? including fuel flow everything i just want my bike ruinning again.

 

Changing clutch should not warrant a jetting change. If you have not put on a slip on or header go back to stock jets everywhere. Believe 3 turns out on air screw. If it ran OK before clutch install and bad after clutch install than something in not right with the clutch.

 

what if i buy a edelbrock 440ex carb kit it comes with a 440 carb. can i just install it to my 400ex 2003 without having to tune anything. do i need to buy anything else before i put that carb on? or can i just put the carb on and it should work?

 

No need to buy an expensive carb. It's probably jetted for a 440cc piped EX anyway. Just install the stock jets, screw your air screw all the way in then back it out 3 turns. That should get you back to stock. I do not see why they would tell you to mess with the carb from a clutch change.

 

which is the air screw??? im getting that new carb anyway can i do that.... just install it and it should work or do i gotta buy anything else . im getting that carb for christmas because i wanna make my 400 faster

 

If you want to make it faster get an exhaust and a 3 dollar jet. A carb is not worth the price. IMO it's not worth a quarter of the price. The gain from just a slip-on will be much more than from the carb. Besides, that carb is designed for the highly modified big bore which will breath much more than your stock EX. I do not think it will run correctly. Almost positive it will be jetted incorrectly too.