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HONDA 400EX TIPS - UTV Action Magazine
https://utvactionmag.com/honda-400ex-tips/#:~:text=Swingarms%20are%20the%20weakest%20link%20on%20the%20400EX.,A-arms%20to%20get%20your%20wheelbase%20set%20up%20correctly.
HONDA 400EX TIPS - UTV Action Magazine
https://utvactionmag.com/honda-400ex-tips/
The 400EX is definitely not under-carbureted. The only thing that it needs is to be re-jetted properly. If you have a modified CDI box, here’s a little tip. If your battery voltage is low, your 400EX may not start. It will crank over and act like it will start, but it won’t. Try charging your battery if the machine won’t fire up.
TRX400EX Parts and Performance Accessories - CT Racing
http://ctracing.net/site/atv-performance/honda/trx400ex/
400ex performance tricks | Honda ATV Forum
https://www.hondaatvforums.net/threads/400ex-performance-tricks.26873/
decking the cylinder,,at tdc ..i mill the top of deck at 0..runs cooler and better performance.. i always heli-coil the three 6mm holes by the timming chain... Attachments. Picture 377.jpg. 94 KB Views: 1,141. Picture 387.jpg.
Four Stroke Tech's Mickey Dunlap Honda 400EX Engine Tips
https://www.atvriders.com/articles/four-stroke-tech-mickey-dunlap-honda-400ex.html
Make sure the cam matches the type of riding you are doing and the compression ratio you are running. Heavy duty valve springs and hardened rocker arms are a must with any good performance cam. For racing a big valve head will be beneficial especially with your big carberator. For longevity, an extra oil cooler will be a plus.
400ex Drag Racers Help Me With Gearing! | Honda TRX 450R
https://www.trx450r.org/threads/400ex-drag-racers-help-me-with-gearing.300362/
If it were me...I might try 13/39 or 13/40 gearing with 2nd gear starts. Also - I didn't know you were only 135 lbs. We need to teach you how to ride a cut trans and I need ya to jockey my bike. Gary. My 04/05 Honda TRX450R Site www.garyhott.com. (^^^TRX450R tech articles, dyno testing, pics, vids, and more) Save.
2019 HONDA 400EX EXHAUST SHOOTOUT - Dirt Wheels Magazine
https://dirtwheelsmag.com/honda-400ex-exhaust-shootout/
2019 HONDA 400EX EXHAUST SHOOTOUT. So, study the dyno charts and see which one looks best to you. Also, you should note that some of those companies are no longer in business today. However, FMF and CT Racing are still going strong and they rated at the top of this shootout. When we run these “Blast from the Past” reprint articles, people ...
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