I need help! Anyone that's really good with carbs please lend an idea!

[InsAyneROostin]

I was rejetting yesterday and was trying to find the needle, but couldn't find a way to get to it? And I took the needle jet (the one that the main jet threads into, and there was a small nut on it, and I moved it a bit, and took it out for a ride, after piecing it back together. And then It still felt flat on top. tons of power down low, midrange was okay, but top was FLAT. If anyone could show me a diagram, pics or somethin similar? Anything like that would help SO much. Thanks a lot you guys.

[zephead400ex]

Did you change the main jet? Usually the needle is fine with being left in the stock posistion. I repeat, usually it is fine so you shouldn't need to alter the needle posistion.

What size jets are you running? Stock?

Here is a link to Service Honda.
http://www.servicehonda.com/hard%20parts/atv/trx400ex%2099-04/trx400ex%20frames%20page.htm

[InsAyneROostin]

I'm running a 150 main, with a 42 pilot, and what I mean is, there's the needle jet that the needle goes into, and there was a small nut on it, maybe 2-3 mm thick. Does it do anything?

[InsAyneROostin]

I took off the airbox snorkel like FMF recommended, and put a filter over the hole. and took the choke out too.


Sparkrider #1

[InsAyneROostin]

I also have a WB powerfilter....this may be a dumb question, but should I rejet for that too?


Sparkrider #1

[cals400ex]

there is a needle jet and a needle jet holder. yes, these need to be there. i believe your talking about the needle jet holder. this piece has the nut on it. when the nut is tightened down on the needle jet holder, make sure you can see 2-3 threads on the needle jet holder. you will notice a nice loss in power if this is adjusted wrong.

[InsAyneROostin]

Thank you so much! I'm gonna go tear into it now and redo it...Thanks again! Peace.