Jump to content
Sign in to follow this  

DRZ400 with YZ426 carb...

Recommended Posts

I wrote this under fuel forum but haven't heard from anyone, then thought this may be a better place to put it:

I have a 00 DRZ400S with an 02 YZ426 fcr-mx carb. I was able to use the oem “S” boots but the installation is difficult (airbox side carb bell could be longer I think) and throttle housing rubs the frame when it's level. The stock DRZ400S cables fit if you turn the bent one up. I can't use the petcock reserve (no vacuum to connect to.) Cams are hotcams degree'd to suggested spec. Stock top end. E model header, YZ250F exhaust (Dimensions similar Yosh RS3) with a 6” sealed mid pipe to mate the two. I have some parts not installed: “E” model sub-frame, “E” air-box, no boot for it, and “E” CDI. So far I have found the following jetting from TT:

426 stock air jets are all the same as what was suggested

MJ 160 or 165

Needle EMN or EMR

Piot 45 or 50

My conditions:

Elevation 1500-4000 (mostly 1500)

Temp: 50-115 f (Pheonix AZ, several months over 110)

I notice that I have to jet 2 times per year for the temp and fuel, when it gets cold they add alcohol, when it's hot they back off alcohol. It is noticeable, I go from bogging to detonating(rich/lean). I hear its upwards to 27% in winter.

Riding type: Hard packed dirt, with sand and loose shale on top, whooped out rocky trails, and baby head size rock ravines, the worst of the worst. I need it to hit power when I want it, but not stall when in technical low speed stuff.

Here's my questions:

What baseline jets/needles would you recommend, including one up and down for each so I can dyno tune?

Are the “S” model boots sufficient, or do I use something else?

If not, are there Sudco p/n's for boots?

Is the wire mod or taffy mod recommended and do yo have a link to that mod if needed?

What is your impression of the Quickshot 3 by boyesen? Band-aid?

I know this is a big post, so thanks all for your patience and input.

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  

×