Description
Product Overview
Revive your Honda ATV's performance with the iFJF Complete Carburetor Assembly — a direct plug-and-play replacement engineered for the Honda TRX400 FourTrax, Sportrax, and TRX400X models (1999-2014). Fully assembled and pre-tuned from the factory, this carburetor eliminates the frustration of rebuilding a worn-out unit. Whether your OEM carb is gummed from ethanol fuel, corroded internally, or beyond its service life, this replacement restores crisp throttle response and reliable starting at a fraction of dealership cost.
Key Features
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Complete Drop-In Assembly — No rebuilding or tuning required. Unbox, bolt on, and ride.
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OEM-Spec Calibration — Pre-set pilot screw and jetting matched to Honda TRX400 engine specs.
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Brass Pilot Screw Plug — Includes factory brass plug. Accessible for fine-tuning with aftermarket exhaust.
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Reliable Cold & Hot Starting — Enrichment circuit dialed for consistent first-start performance.
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Direct Replacement — Replaces Honda OEM 16100-HN1-A43. No adapters needed.
Compatibility
| Make |
Model |
Years |
Engine |
| Honda |
TRX400X |
2009-2014 |
397cc 4-Stroke |
| Honda |
TRX400EX Sportrax |
1999-2008 |
397cc 4-Stroke |
| Honda |
FourTrax TRX400 |
1999-2014 |
397cc 4-Stroke |
Specifications
| Spec |
Value |
| Replaces OEM |
16100-HN1-A43 |
| Type |
Complete Carburetor Assembly |
| Bore |
35.5mm Stock |
| Fuel |
Gasoline |
| Choke |
Manual Enrichment |
| Material |
Die-Cast Aluminum |
Why Choose iFJF
Worn or ethanol-clogged carburetors cause hard starting, erratic idle, and bogging under acceleration. Rebuilding often reveals corroded passages no kit can fix. Our complete assembly is the smarter, faster solution — OEM performance at a fraction of the cost.
Installation Tips
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Drain fuel tank and disconnect the fuel line.
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Remove airbox boot and throttle cable from old carb.
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Transfer throttle cable to new carb before mounting.
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Tighten bolts evenly — do not overtighten.
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Prime fuel system and check for leaks before starting.
Frequently Asked Questions
Q: Is this carburetor pre-tuned?
A: It arrives pre-calibrated to OEM specs. Pilot screw accessible behind brass plug for fine-tuning.
Q: Does it fit TRX400EX?
A: Yes — direct fit for all TRX400 variants 1999-2014 including EX, X, and FourTrax.
Q: Are gaskets included?
A: Yes, mounting gaskets are included. Reuse existing intake boot and airbox clamps.
Q: Rebuild or replace?
A: If cleaning/rebuild doesn't fix persistent issues, internal passages are likely permanently restricted — replacement is the fix.
Q: Works with aftermarket exhaust?
A: Yes. Fine-tune via accessible pilot screw. Major mods may need main jet change (sold separately).
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