2004–2006 Honda Fourtrax Rancher TRX350TM / TE / FM / FE Service Manual (P/N 31SC000)

This 442-page manual delivers the factory specifications and maintenance standards needed for service and repair across the 2004–2006 Rancher lineup. It covers mechanical teardown, driveline work, chassis service, and electrical diagnostics while keeping the 2WD/4WD and foot-shift/ESP versions separate wherever procedures or specifications differ.

• Supported Models: Fully covers the TRX350TM (2WD, left-foot-operated gearshift), TRX350TE (2WD, Electric Shift Program), TRX350FM (4WD, left-foot-operated gearshift), and TRX350FE (4WD, Electric Shift Program) configurations.
• Manual Scope: Supplied as a 442-page PDF organized through General Information, Technical Features, Frame/Body Panels/Exhaust System, Maintenance, Lubrication System, Fuel System, engine and transmission repair, chassis and brake service, front and rear driving mechanisms, electrical systems, Wiring Diagrams, troubleshooting, and index sections.
• Deep Technical Data: Features standard torque tables for 5–12 mm fasteners, engine and frame torque values, wear limits, clearances, fluid specifications, carburetor settings, electrical test values, connector checks, and model-specific service data.
• Shift Program Diagnostics: Thoroughly documents the Electric Shift Program (ESP) used on TE and FE models, including the ECU, control motor and reduction gears, angle sensor, gear position switch, speed sensor, reverse shift switch, gearshift switch, and ignition pulse generator.

Engine and Chassis Specifications

This reference details the 329.1 cc longitudinal single-cylinder OHV engine and its forced-pressure dry-sump lubrication system. Factory specifications include a 78.5 × 68.0 mm (3.09 × 2.68 in) bore and stroke and 8.8:1 compression ratio. Lubrication coverage extends into the integral oil tank in the crankcase, trochoid oil pump with feed and scavenge functions, oil cooler, and the related oil passages and relief-valve components.

The wear data is specific enough for actual teardown decisions. Cylinder compression is specified at 667 kPa (97 psi) at 450 rpm, with intake and exhaust valve clearance at 0.15 ± 0.02 mm (0.006 ± 0.001 in). The cylinder I.D. service limit is 78.60 mm (3.094 in), crankshaft runout is limited to 0.06 mm (0.002 in), and connecting-rod big-end radial clearance has a 0.05 mm (0.002 in) service limit. Cylinder/piston inspection, rocker arms, push rods, valves, valve guides, camshaft and cam-chain components are covered alongside transmission measurements for the shift forks, gear bushings, mainshaft, countershaft, reverse-idle shaft, and gear-to-bushing clearances.

Drivetrain coverage includes the centrifugal and wet multi-plate clutch system, the constant-mesh 5-speed transmission with reverse, clutch/gearshift linkage, crankshaft and balancer, alternator/starter clutch, and recoil starter. The FM/FE chapters go further into the front drive shafts and the A.P. Suretrac torque-biasing front differential, while the rear driving mechanism section covers the rear axle, final drive, ring gear, pinion, bearings, backlash, and case service.

Chassis information is equally model-specific. The manual covers the double-wishbone front suspension, swingarm rear suspension, wheel hubs and knuckles, suspension arms, steering shaft and tie-rods, front and rear shock absorbers, swingarm pivots, hydraulic front drum brakes, and mechanical rear drum brake. Frame/body procedures identify the seat, side covers, utility box, fuel tank cover, center and front mud guards, front carrier/carry pipe, front and rear fenders, tool box, inner and outer fenders, headlight and taillight grills, and exhaust system rather than treating body removal as a single generic operation.

Electrical Data and Routine Maintenance

Detailed electrical sections map out the Battery/Charging System, Ignition System, Electric Starter, Lights/Meters/Switches, and Electric Shift Program. Factory baselines are clearly stated, including the 1,400 ± 100 rpm idle speed and 22 N·m (16 lb-ft) spark-plug torque. Diagnostic coverage includes charging-system inspection, alternator charging-coil and regulator/rectifier checks, ignition-system inspection and timing, starter-motor and starter-relay testing, diode checks, handlebar and brake-light switches, gear-position and speed-sensor circuits, combination-meter functions, carburetor-heater circuits, and ESP fault tracing.

Fluid quantities are given for the actual service condition, not as a single nominal capacity. Engine oil capacity is 1.95 L (2.06 US qt) after draining, 2.0 L (2.1 US qt) after draining with filter change, and 2.5 L (2.6 US qt) after disassembly. The specified viscosity is SAE 10W-40, API SG or higher.

On FM/FE models, the front differential takes 241 cm³ (8.2 US oz) after draining or 275 cm³ (9.3 US oz) after disassembly. Rear final-drive capacity is 85 cm³ (2.9 US oz) after draining and 100 cm³ (3.4 US oz) after disassembly. Both driveline sections specify SAE #80 hypoid gear oil. Fuel capacity is 13.9 L (3.67 US gal) with a 3.1 L (0.82 US gal) reserve.

Torque coverage reaches well beyond routine maintenance. Examples include the 108 N·m (80 lb-ft) change-clutch center locknut, 118 N·m (87 lb-ft) centrifugal-clutch locknut, 108 N·m (80 lb-ft) steering-shaft end nut, and 137 N·m (101 lb-ft) rear wheel-hub nut. The tables also identify where locking agent, replacement locknuts, castle-nut alignment, staking, or oil- and grease-treated threads are specified.

The Wiring Diagrams section provides separate schematics for the U.S.A. TM model, U.S.A. FM model, U.S.A./Canada/World TE/FE models, and Canada/World TM/FM models. Other technical illustrations called out in the manual include the Oil Management System Drawing, A.P. Suretrac torque-biasing front differential construction and operation drawings, ESP Component Diagram, Cable & Harness Routing views, Lubrication System Diagram, and Electric Starter System Diagram.

Shop-Level Repair Procedures Covered

The service manual documents the procedure sequence, inspection points, special-tool references, service limits, and reassembly data for repair jobs that are commonly sent to a dealership or independent ATV repair shop:

• Engine and top-end repair: engine removal and installation; cylinder-head removal, disassembly, assembly, and installation; valve-guide replacement; valve-seat inspection/refacing; camshaft removal and installation; cylinder/piston service; compression testing; and valve-clearance service.
• Clutch, transmission, and starting-system repair: centrifugal clutch and change-clutch service; gearshift linkage, gearshift spindle, and reverse mechanism work; recoil starter; alternator stator; flywheel/starter clutch; crankcase separation; transmission repair; crankshaft/balancer inspection; and crankcase-bearing replacement.
• Driveline, steering, suspension, and brake repair: front drive-shaft service and FM/FE differential removal, disassembly, case-bearing replacement, assembly, and installation; rear axle and final-drive service; wheel hubs and knuckles; steering shaft and tie-rods; suspension arms, shock absorbers, and swingarm; brake-fluid replacement/air bleeding; front master cylinder; front wheel cylinders; and front/rear drum-brake service.
• Fuel and electrical repair: carburetor removal, disassembly/inspection, assembly, and installation; air cut-off valve and vacuum-chamber service; float-level inspection; pilot-screw and high-altitude settings; battery/charging, ignition, starter, lighting/meter/switch diagnostics; and ESP troubleshooting.

There are several repair traps where the exact factory data matters. The carburetor pilot screw can damage its precision seat if it is bottomed hard, making later mixture adjustment unreliable. On the rear suspension, the right swingarm pivot bolt is specified at only 4 N·m (2.9 lb-ft) while its pivot locknut is 118 N·m (87 lb-ft); confusing those two values can overload the pivot and bearing stack. The FM/FE differential and rear final drive are also sensitive to bearing seating and ring-and-pinion backlash, where an incorrect setup can produce gear noise, heat, and rapid wear.

Before repair work, follow the manual's job-specific safety notes: support the ATV securely before wheel or suspension service, isolate the battery before starter-circuit disassembly, keep fuel-system work away from flames or sparks, and prevent contamination when servicing the DOT 4 hydraulic brake system. Electrical diagnostics that require live measurements should be performed only under the test conditions specified in the manual.

For a Rancher with an ESP shift fault, 4WD driveline noise, low compression, clutch slippage, charging trouble, or abnormal brake or steering wear, the practical advantage is having the exact model-specific limit or test value needed to determine whether a component is actually out of specification before repair parts are replaced.