TRX400 Carburetor Compatible with Honda TRX400EX TRX400X - Direct Fit

In this review the TRX400 carburetor is assessed as a straightforward replacement for owners of Honda Sportrax and FourTrax 400 models who need a direct-fit, economical carburetor. The single biggest reason to buy is compatibility: this unit replaces OEM numbers 16100-HN1-A43 and 16100-HN1-013 and lists specific diameters for both the air filter and intake manifold sides, making it a practical choice for those who want a plug-and-play swap without modifying the motorcycle or ATV. It suits riders prioritizing readability of fitment and easy installation.

Key Features

• OEM Compatibility: Replaces 16100-HN1-A43 and 16100-HN1-013, which simplifies sourcing a replacement for the correct Honda TRX400 years.
• Clear Fitment Range: Fitment covers Sportrax TRX400EX 2000-2008, TRX400X 2009-2014 and FourTrax TRX400 1999-2000, helping buyers verify compatibility before purchase.
• Measured Diameters: Air filter side and intake manifold side diameters are specified so users can confirm a precise mechanical match without guesswork.
• Durable Construction: Made from high grade materials with impact resistant and anti-corrosion properties for longer life under off-road conditions.
• Plug-and-Play Installation: Described as direct replacement and easy to install, reducing workshop time and need for custom modification.
• One-Year Warranty: Includes a 12 month after-sales warranty to address defects or fitment issues post-purchase.

Who It's For

The TRX400 carburetor is best for owners of Honda Sportrax TRX400EX (2000-2008), TRX400X (2009-2014) and FourTrax TRX400 (1999-2000) who need a budget-friendly, direct replacement that lists the exact diameters for the air and intake sides. It appeals to DIY mechanics and riders who want a quick swap with minimal tuning out of the box.

Riders who demand OEM-level refinements in factory finish, or who want a carburetor pre-jetted for modified engines and nonstandard exhaust or intake systems, should look elsewhere. Those expecting improved fuel economy without any tuning or tuning guidance may see mixed results according to customer feedback.

Pros & Cons

Pros

• Runs great out of the box for many users and is noted for ease of installation.
• Direct replacement for listed OEM numbers, simplifying fitment verification.
• Durable materials with impact resistance and corrosion protection for off-road use.
• Includes a one-year warranty for post-purchase support and peace of mind.

Cons

• Some customers report mixed results on build quality and fuel efficiency, so performance may vary with engine condition and tuning.
• Not pre-jetted for modified engines, so additional adjustment may be required for nonstock setups.

Specifications

Compatible Models	TRX400EX 2000-2008; TRX400X 2009-2014; FourTrax TRX400 1999-2000; Sportrax 2001-2015
Replaces OEM	16100-HN1-A43, 16100-HN1-013
Air Filter Side Outer	58mm (2.28in)
Air Filter Side Inner	54mm (2.12in)
Intake Manifold Outer	43mm (1.69in)
Intake Manifold Inner	39mm (1.53in)
Warranty	12 months after-sales warranty

Our Verdict

The TRX400 carburetor is a sensible, value-oriented replacement for owners of the specified Honda TRX400 models who want a direct-fit, easy-to-install carburetor with clear dimensional data and a one-year warranty. It is good value for riders with stock engines or lightly modified machines; anyone needing precise fuel tuning or OEM finish should be prepared to make adjustments or consider other options.

Frequently Asked Questions

Will this carb fit my TRX400X 2010?
Yes, the listed fitment includes TRX400X model years 2009-2014 so a 2010 model is covered.

Are the diameters provided enough to check fitment?
Yes, the product lists both outer and inner diameters for the air filter and intake manifold sides so you can confirm a mechanical match before buying.

Is any additional tuning required?
Some users may need to adjust jets or settings for optimal fuel efficiency or for modified engines, since this unit is supplied as a direct replacement rather than a pre-jetted performance carburetor.