400ex carb on a 330ex?

[hondardr4life]

I have been searching around and reading things, and I can't find much on how this will run. Some people say it worked good for them, others say it ran like crap. I would buy an edelbrock, but they are to expensive for me. How do you think it will run with the mods I have done??

[MX300ex]

im running a 400ex carb...but since u got like a 330kit etc dont waste ur money on a 400ex product...buy a bigger 300ex carb...itll work out the best for u

[hondardr4life]

Well it's kinda too late now, I already bought the stuff. I just need some help on what size jets to run in it, and if I am going to be screwed with this set up, or if I will actually gain some power.

[ghak99]

I am very pleased with how mine runs with the 400ex carb. I will have to say they are a pain to get jetted just right, and it has to be almost perfect or it will not run right.

I believe most people who are disappointed either have a basically stock motor, that dosn't need a big carb, or never get the jetting perfect.

[hondardr4life]

About how many cc's are you up to with your 250? And what Kind of jetting do you have in it (stock kehin jet sizes), just so that I have an idea of where to start at. I have heard that a 150 main works well for a stock motor, so I am guessing that I will be up around 160 or something like that.

[ghak99]

Right around 377cc's i believe, I have not done the math for a while. Every motor and carb is a little different, but I would say 160-165 would be a good place to start.

[Hoggr9]

The 400 carb worked good for me.
I'm only .020 overbore with 11 to 1 Wiseco and Webcam,ported and polished I'm running a 155 main now soon to try a 158.
For the $$ this was a good improvement on my machine.

[44oEX]

my buddy has one on his 300 and wow !!!

I would start with a 160 main and 42 pilot

[hondardr4life]

Ok, thanks for the tips guys. Sounds like I need to get around a 158 or 160. If that does run right with those jets, then it's gonna make my motor run a lot better because I only have a 148 main in right now.

[dork]

they work well and they're not hard to jet if you have a clue what you're doing. remember, with the smaller motors, like the 300ex, you may need bigger jets than the 400ex needs due to its smaller displacement creates less vacuum signal in the venturi. a 155 or 160 is a good start and 45 pilot, needle in third clip.