2012 TRX 400X Re Jet - Honda TRX Forum
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post #1 of 2 Old 03-14-2017, 12:09 AM Thread Starter
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2012 TRX 400X Re Jet

Just looking for some experienced input on jetting my bike. I just bought a full HMF Euro exhaust and I'm running a UNI filter. The exhaust is muffler, mid pipe and headers. The system comes with a jet kit and I'm wondering if anybody has a recommendation for which main jet I should use and how I should tune my needle. I live at sea level, any help would be appreciated!
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post #2 of 2 Old 04-06-2017, 08:53 PM
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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.
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