Honda 400EX Engine and Exhaust Upgrades: How To Make A 400EX TRX450R Fast @ATVonDemand

Uploaded December 2021 | Updated September 2026, 3 days ago

Honda 400EX Engine and Exhaust Upgrades, How To Make A 400EX TRX450R Fast. CT Racing Engine's Allen Knowles explains what it takes to make the torquey and fun Honda 400EX engine as fast as a piped TRX450R.

Ideal for those in need of an engine rebuild, this engine included a CT Racing Exhaust, porting, 5-angle valve job, 13:1 high compression JE piston, 2004-2005 TRX450R carburetor, Uni air filter, and more.

Learn more about CT Racing's 400EX engine packages here.
ctracing.net/site

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