2000 YZ426 Leak Jet Question

2 replies to this topic
  • mn_biker

Posted April 04, 2013 - 08:18 PM


Hi everyone,

So, I hate to bring this up since it appears that it has been beaten to death but I am having an issue with my bike.

I am having a hard time finding my leak jet on/in my carb. I've read everything I can find on locating it and I cannot find to save my life. I took a picture of the float bowl so maybe one of you can help me out.

The reason I am trying to find it is to do the DOC mod because I did the BK mod earlier tonight.

Attached Thumbnails

  • IMAG0386.jpg

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  • grayracer513

Posted April 04, 2013 - 09:31 PM


You're having trouble with that because there isn't one. The first YZ4xxF with a leak jet was the '05 450.

If it had one, it would be in the dimple you see at the bottom of the bowl, at 7:00 o'clock to the center jet well plug in your picture, directly above the hole at the bottom of the picture, directly right of the hole on the left edge.

  • mn_biker

Posted April 05, 2013 - 10:50 AM


OK. So no leak jet means no need to do the DOC mod then? I'm guessing since I don't have one the AP is always at full? My bike was a bear to cold start before I dug into it and found the valves were too tight. So I'm trying to get the carb all setup before I put it back on the bike.

If I'm correct I'll just replace the MJ, PJ, and needle with my new FMF ones and install the new AF screw too. Although I do think I need to replace my AP diaphragm because I found a small tear in it.

Of course I'll still have to set the AP timing and length.

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