2003 Honda TRX650FA Rincon ATV Service Manual

Honda Motor Co., Ltd.’s July 2002 service manual covers the 2003 Honda TRX650FA Rincon ATV, including its automatic/ESP transmission and selectable 4WD system.

Chapter Bookmarks, Wiring Detail, and PDF Contents

Chapter access and diagram detail: Embedded PDF bookmarks provide access to the main chapters and index, but PDF text search is not available. Small wiring labels require zooming; some densely packed ECM/TCM labels remain soft. Printed pages 24-43 and 24-44 appear in reverse order.

One printable English PDF contains 530 pages, including both covers, three opening pages covering safety, contents, and symbols, one memo page, and two repeated transmission oil-pressure-check pages.

Engine, Automatic Transmission, and Running-Gear Service

These selected service topics are part of a wider workshop reference that also includes spark arrester cleaning and tire repair.

• Engine repair: Step-by-step procedures for cylinder-head servicing, valve-guide replacement, valve-seat refacing, camshaft inspection, cylinder/piston work, and crankshaft service.

• Automatic transmission: Hydraulic pressure testing, shift-valve-body service, shift-clutch/mainshaft disassembly and assembly, and torque-converter removal, inspection, and installation.

• Fuel system: Carburetor overhaul, float and jet inspection, diaphragm checks, pilot-screw adjustment, high-altitude adjustment, and fuel-tank service.

• Cooling and lubrication: Cooling-system pressure testing, coolant replacement and air bleeding, thermostat inspection, water-pump seal replacement, and oil-pump service.

• Front and rear drive: Drive-shaft and boot service, differential and final-drive repair, bearing replacement, gear backlash measurement, and tooth-contact inspection.

• Brakes and chassis: Hydraulic brake bleeding, master-cylinder and rear-caliper repair, front drum-brake service, suspension-arm work, and steering-shaft inspection.

• Electrical and 4WD diagnosis: Ignition, charging, and starting-system tests, transmission problem-code troubleshooting, speed-sensor checks, and front final-clutch circuit diagnosis.

The service and repair information is intended for qualified professional technicians with the training, tools, and equipment required for the work.

Engine Inspection and Internal Repair

Factory tolerances cover rocker arms, push rods, cam followers, valves, guides, piston rings, and crankshaft bearings. The engine chapters also document cam-chain timing, crankcase separation, balancer installation, and component-specific lubrication and torque requirements.

The cylinder-head-cover instructions identify a specific assembly hazard: tightening the cover with the rocker arms incorrectly aligned to the push rods can cause severe engine damage.

Carburetor, Cooling, and Lubrication Work

Carburetor procedures extend to the vacuum piston, air cut-off valve, primer diaphragm, float valve, and individual jets. The manual connects carburetor and throttle-cable work with the transmission system’s initial-setting procedure.

The Cooling System Flow Pattern and Lubrication System Diagram show the associated fluid paths. Cooling-system service includes water-pump mechanical-seal replacement; lubrication coverage includes oil-pressure checks, pump inspection, and oil-cooler service. Crankcase emission-control illustrations explain the breather circuit.

Transmission Diagnosis and Repair Scope

The Troubleshooting Chart of Hydraulic Circuit relates pressure-test results to the valve body, feed pipes, oil pump, strainer, and shift clutches. Together with electrical resistance specifications, these references let technicians compare hydraulic and electrical findings before planning internal repair.

The torque converter and first shift clutch can be serviced with the engine installed. Mainshaft and second/third shift-clutch work requires engine removal and crankcase separation. A faulty torque converter is replaced as an assembly.

Sub-transmission coverage addresses the forward-neutral-reverse mechanism and gear-selector linkage. Shift Clutch Hydraulic Circuit and Operation diagrams explain clutch engagement and hydraulic control. The manual also warns that impact or handling loads can damage the shift-valve-body solenoids during engine removal.

Electrical Fault Tracing and Selectable 4WD

Problem-code retrieval, erasure, and initial-setting procedures accompany circuit tests for sensors, switches, solenoids, and ECM-to-TCM communication. Selectable 4WD diagnosis covers the front final clutch and front/rear vehicle-speed sensors.

The full wiring diagram, connector terminal views, and Cable & Harness Routing drawings support tracing faults across the charging, ignition, starter, and control circuits. Tool references include inspection adaptor 07GMJ-ML80100 and pressure gauge set 07406-0020005.

Brakes, Suspension, and Final Drives

Chassis sections cover wheel hubs, knuckles, suspension pivots, ball joints, steering components, and body-panel access. Front differential and rear final-drive procedures include shim selection and contact-pattern checks. Brake coverage distinguishes the front hydraulic drums from the rear disc and parking-brake mechanism.

Working on the drivetrain or pressurized systems requires adherence to the manual’s safety precautions, torque requirements, and factory tolerances.

Selected Valve-Clearance, Coolant, and Converter Specifications

Valve-clearance specifications are 0.15 mm intake and 0.33 mm exhaust with the engine cold, below 35°C/95°F. The cooling specifications list 2.0 liters for the radiator and engine, excluding the reserve tank.

The torque-converter lock-nut specification is 118 N-m (87 lbf-ft). Its associated requirements include a new nut, engine oil on the threads and seating surface, and staking.