Jump to content
Sign in to follow this  

what jet does what ????

Recommended Posts

Hi again,

I have been trying to do the 3x3 mod to my 2004 DRZ400E but Im still having problems.

I fitted:

162 main jet (was 142)

45 pilot

2 1/2 turns fuel (was 1 1/2)

5th clip on stock needle

centre plug drilled out of stock pipe now

snorkel out

It ran ok but far from great so I took the side panel off the air box and it runs significantly better, picking the wheel up in 3rd gear...so I assume I am running rich.

However with the airbox back on it feels lean when just cruising on minimal throttle, a bit like its running out of fuel.

Is there somewhere which explains what each jet does on what rev/throttle range and how they overlap ?

Im suspecting I need a bigger pilot jet..or do I unwind the fuel screw...and should I lower the needle clip to lean up the mid, high end ?????????

Thanks for a great forum...shame you have to keep opening new threads to keep the advice flowing. :thumbsup:

Share this post

Link to post
Share on other sites

You do not do a 3 X 3 mod on a "E". You just remove the intake snorkel and the hole is 3 X 3 (more or less). Your jetting is good with the exception the main jet could be a size or 2 smaller. 5th notch on the needle is 5th from the top, right? I can't explain the side cover thing. I would look for some restriction to the air intake. With the side cover off you can see up thru the air box intake.

Share this post

Link to post
Share on other sites

Thanks guys.

I understand that the 3x3 mod on an 'E' is to remove the snorkel, thats what I have done.

From reading the links it sounds like I am lean on the pilot and possibly rich on the main (removing the side panel lets more air in and will lean the mixture).

I will first try opening the fuel screw to let more fuel in on the pilot curcuit (from 2 1/2 turns to 3) and if that doesnt work I will have to source a 48 pilot jet.

Once I have that end cleaned up Ill play with the needle as its a pretty quick change to see if I really need a leaner main jet.

One thing I do know with the 3x3 mod is it makes the bike an awful lot louder !!!!


Share this post

Link to post
Share on other sites

Because of the overlap between each circuit, you should always adjust a carb in the following order.

First, float level as this affects all the the jetting, then main jet, needle and finally the fuel screw/pilot jet.

If you do it in any other order it will affect something you have already set.

Neil. :thumbsup::ride::applause:

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this