Sun Coast Cycle Sports offers inspected used parts for the Honda TRX420 Rancher (FourTrax Rancher), Honda's mid-size utility ATV produced from 2007 to present. The Rancher uses a 420cc liquid-cooled fuel-injected single-cylinder engine available in multiple drivetrain configurations: 2WD or 4WD, manual transmission or automatic (ESP electric shift or DCT dual-clutch), and solid rear axle or independent rear suspension (IRS). This versatility makes the Rancher one of Honda's best-selling ATV platforms. Every part is inspected, photographed individually, and ships from our Odessa, Florida facility.
TRX420 Rancher generation and parts compatibility
| Period | Years | Engine | Key details |
|---|
| Gen 1 TRX420 | 2007-2013 | 420cc single, EFI | Multiple configs: 2WD/4WD, manual/ESP/AT, solid axle/IRS |
| Gen 2 TRX420 | 2014+ | 420cc single, EFI | Revised styling, DCT option, updated suspension, EPS option |
Parts compatibility depends heavily on the specific drivetrain configuration. A TRX420 with a manual transmission uses different transmission, shift mechanism, and associated components than an ESP or DCT model. Similarly, 2WD and 4WD models differ in front differential and driveshaft components, and IRS models use different rear axle assemblies than solid-axle models. Engine core components, bodywork/plastics, brakes, and electrical systems are more broadly interchangeable within each generation. Always verify the exact model code (TRX420FM, TRX420FA, TRX420FE, TRX420TM, etc.) when ordering parts.
Common TRX420 Rancher failure points and replacement parts
Electric shift program (ESP) issues: The ESP electric shift system can develop angle sensor faults, shift motor failures, or ECU communication errors that prevent proper gear changes. Symptoms include the gear indicator flashing and the ATV stuck in one gear. Angle sensor replacement and shift motor service are common repairs.
CV boots and joints (4WD/IRS models): Four-wheel-drive and IRS-equipped Ranchers use CV joints that are exposed to trail debris. Torn CV boots allow contamination that destroys the joint. Regular boot inspection and prompt replacement of torn boots prevents expensive CV joint failure.
Fuel pump relay: The fuel pump relay can fail intermittently, causing no-start conditions or stalling. This is an inexpensive component but can be difficult to diagnose without electrical testing.
Cooling system (hard-working utility use): Ranchers used for heavy utility work (towing, plowing, slow-speed operation) can overheat due to insufficient airflow. Radiator cleaning, thermostat verification, and fan operation checks are important maintenance for utility-use machines.
Commonly replaced TRX420 Rancher parts
- ESP angle sensor and shift motor
- CV boots, joints, and axles (4WD/IRS)
- Fuel pump and relay
- Plastics and fenders
- Brake pads and shoes
- Air filter
- Starter motor and solenoid
- Radiator and cooling fan
Frequently asked questions
Q: Are all TRX420 Rancher variants interchangeable?
Engine core components, plastics, brakes, and electrical basics are broadly shared. However, the drivetrain configuration (manual vs ESP vs DCT, 2WD vs 4WD, solid axle vs IRS) determines which transmission, axle, and drivetrain parts are compatible. Always match the exact model code when ordering drivetrain components.
Q: Will TRX350 Rancher parts fit a TRX420?
No. The TRX420 (2007+) is a different platform from the TRX350 Rancher (2000-2006). Different engine, frame, and most components. They share no major parts despite both carrying the Rancher name.
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