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2858 Views 2 Replies 3 Participants Last post by  Truegrit
I installed a Dynojet this weekend and was wondering why I had to adjust the (mixture screw). Is this for the main jet or the Idle circuit ?
The machine also seems to be running a little lean. I followed the instructions and installed the 126 jet. It had a 130 jet in it. Is this stock?
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I put a Dynojet kit in my Foreman about a month ago. Like you, I followed the directions in the package, and put in the 126 jet. The smaller needle is why they start with the smaller jet. Mine also ran lean set up this way. I went back and put the 130 jet in, I left the new needle set up like the instructions recommended. I used the 130 jet in the kit , not the 130 that came out of my carb. Not that there is any difference in them.

After changing to the 130 jet, it ran like it should. I put the kit in after changing to a UNI filter and an HMF pipe.
The misture screw controls from off Idle to 1/4 throttle. The pilot jet and needle control from 1/4 to 3/4 throttle. The main jet is 1/2 to full throttle.
The idle should have been set so it idles smoothly befor the kit was installed. It should have no effect on the jet kit.

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This is a link to HMF. It gives you a good run down on how to preform a plug chop test. You need to find out where your bike is running lean at, 1/4, 1/2, 3/4 or WOT, to know where and what to adjust.
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