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Old 04-17-2011, 03:49 PM   #1 (permalink)
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Cool more torque

Im tryin to get more torque and snappy throttle out of my 2009 Trx400x. I was told that if you put a larger sprocket in the front and smaller sprocket in the back, tha will give a big increase in torque but you lose top end. i also heard that i can get my quad re jetted for more torque. are these statements true? And id like suggestions how to get more torque. i do a lot of track riding and i want snappier throttle and more torque. thank you!
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Old 04-17-2011, 04:03 PM   #2 (permalink)
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Welcome to the forums. You have the info about the sprockets backwards. A smaller front sprocket or a larger rear sprocket will give you more torque, but less top speed. Some of the sport quad guys should be online soon to help you with your questions.
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Old 04-17-2011, 04:58 PM   #3 (permalink)
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Smaller front and bigger back makes more torque and less top end.
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Old 04-17-2011, 06:36 PM   #4 (permalink)
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Best way to gain torque is to open you airbox lid up get an air filter (I prefer UNI) and get an exhaust system, slip-ons work ok but full systems are definitely the way to go. I would recommend and HMF system, I didn’t know what I was doing when I bough my Lexx, wish I would have spent the extra $50. Hit me up with any performance or jetting questions!
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Lexx MXe slip on
Armadillo full body and swing arm skid plates.
450r front suspension


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Old 04-17-2011, 06:49 PM   #5 (permalink)
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isnt it bad to open up the lid on the air box? i mean i just have the stock foam air filter and i spray the filter oil on it. i just never though it was good to open the box.
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Old 04-17-2011, 06:53 PM   #6 (permalink)
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I suggest a UNI filter if you opend the lid but just a good exhaust and proper jetting wakes up the 400EX alot
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Old 04-17-2011, 07:26 PM   #7 (permalink)
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Agreed^^^^ Its only bad to run with the airbox lid off if you don’t jet accordingly. I bought a K&N powerlid and that keeps a lot of debris and mud out while giving me a ton of air flow. Also another really great upgrade for the 400ex is getting a set of 450r front shocks especially if your riding on tracks and jumping a lot like I do. That was the best upgrade I did hands down. I almost never bottom out anymore and I can jump higher and farther.
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2008 TRX400ex

42 pilot jet
Stage 2 Dynojet kit
K&N Powerlid
Lexx MXe slip on
Armadillo full body and swing arm skid plates.
450r front suspension


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Old 04-17-2011, 07:43 PM   #8 (permalink)
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awesome thanks man. Im liking the shock upgrade because i enjoy track riding (mainly jumping everything in sight). now with jeting what does that exactly mean, like what does it entail for performance on my quad? and i would have to take it somewhere to have it done, correct?
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Old 04-18-2011, 12:25 AM   #9 (permalink)
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you can do it yourself, if you follow the directions accordingly its a piece of cake. as for jetting, if your going to upgrade your air filter and put on a aftermarket exhaust then you will need a stage II jet kit. order it machine specific and ebay has them for around $45
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Old 04-18-2011, 09:34 AM   #10 (permalink)
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Ok, your atv has a carburetor, inside the carb are 3 jets, a pilot jet a.k.a. slow jet, a needle jet and a main jet. I’m going to give you a lot of information to digest so feel free to ask questions, I’ll also post a few links to help you out. When ever you improve airflow IE exhaust, intake etc... you need to get larger jets because with more airflow you need more fuel. Jetting in itself isn’t hard, its just figuring out what you want to do. For example, I have a slip on and an a powerlid which is effectively an open airbox. I had to put a 170 main jet in. If you don’t rejet accordingly you will run lean which will lead to more heat which can lead to engine failure. Rejetting is critical. Dynojet makes a good jet kit if your just planing on running an air filter and/or open airbox and slip on. If you want to get a full exhaust system you’ll need to go elsewhere. What exactly are you planning on doing? You may also want to upgrade you pilot jet to a 42 or 45 to help with cold starts. Hear are the links...

Honda 400EX ATV Pilot Jet Insturctions - ATV Technical Articles
Spark Plug Colors Reading Instructions - ATV Technical Articles
ATV Carburetor Jetting Instruction - ATV Technical Articles

Ok, so don’t panic with all that info, lol, when I first joined this forum I was clueless, It will come to you over time.

Also a good way to tell if your running to lean is if your quad is popping or backfiring, and your running to rich if you motor is bogging down or sluggish at full throttle.
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2008 TRX400ex

42 pilot jet
Stage 2 Dynojet kit
K&N Powerlid
Lexx MXe slip on
Armadillo full body and swing arm skid plates.
450r front suspension


Dan in VA

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