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Join Date: Mar 2016
Location: Southwest Louisiana
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No help yet?!
I just tweaked my jetting again on my 08 TRX400EX.
Stock bike and engine, added a LEXX pipe with quiet insert, UNI filter, and Dynojet kit. Used Dynojet needle and recommended clip setting at 3rd groove, main jet I have settled on 142. Gave the best seat of the pants dyno results and a nicely colored spark plug. I'm also at sea level. And I adjusted the idle mixture per Dynojet recommendations. Idles smoothly and runs strong.
If I didn't use the quiet insert for pipe, I'd probably run the 146 main jet.
Hope this helps.