ATRACYPART TRX400 Carburetor for Honda TRX400 (1999–2015) — Direct-Fit Replacement, Restores Throttle Response

High-quality ATRACYPART TRX400 carburetor engineered to restore throttle response and fuel delivery for 1999–2015 Honda TRX400 models.

This direct-fit replacement carburetor is built to match the original equipment dimensions and restore reliable starting, steady idling, and consistent power delivery across the RPM range. It’s manufactured to the same basic tolerances as the factory unit and includes the key bore and flange measurements you need for a correct fit on Sportrax and FourTrax TRX400 ATVs. Use it when your existing carb is leaking, clogged, or no longer delivers crisp throttle control.

Will this carburetor fit my Honda TRX400 model?

Yes — the ATRACYPART TRX400 carburetor is specified to fit multiple TRX400 generations and replaces OE part numbers 16100-HN1-013 and 16100-HN1-A43. Confirm compatibility by checking the intake and airbox flange diameters against your vehicle before purchase.

• Compatible models: 1999–2008 Sportrax 400 TRX400EX 2x4
• Also fits: 2001–2015 Sportrax TRX400 and 2009–2014 TRX400X
• Older FourTrax: 1999–2000 TRX400
• Verify: Intake inner Ø 39mm / outer Ø 43mm; air-filter inner Ø 54mm / outer Ø 58mm

How does this replacement affect engine performance?

Replacing a worn or clogged carburetor can return throttle responsiveness and help the engine run more consistently under load. This unit is machined to provide a proper fuel–air mixture, reducing stumbling, hard starting, and irregular idle caused by degraded internals in the original carb.

• Restores steady idle and crisper throttle response
• Helps reduce fuel puddling and off-idle hesitation
• Matches OEM flow characteristics for predictable power delivery

What are the key dimensions and connections to check before installation?

To ensure a smooth installation, measure the intake and airbox flanges on your ATV and compare them to the carburetor specs. Also confirm that the throttle and choke linkages align with your frame harness and that vacuum or overflow lines match the original routing.

• Intake side: inner diameter 39mm, outer diameter 43mm
• Air filter side: inner diameter 54mm, outer diameter 58mm
• Replace gaskets and clamps for a leak-free seal during installation

What support and warranty come with this part?

The ATRACYPART carburetor is sold with a 12-month warranty against manufacturing defects and functional failures. If the unit arrives damaged or develops issues under normal use, contact the seller for troubleshooting, replacement, or refund options.

• 12-month warranty covering defects and functional failures
• Customer support available through the original marketplace messaging
• Recommended: inspect for shipping damage and test off-vehicle if possible before final installation

Who this is for: This replacement carburetor is aimed at ATV owners and mechanics who need a dependable, direct-fit option for older Honda TRX400 Sportrax and FourTrax machines. It’s a practical choice for riders restoring a TRX400, replacing a leaking or clogged carb assembly, or preparing a machine for regular trail use without the expense and wait time of an OEM special-order part.