2005–2008 Honda TRX500FA / TRX500FGA Rubicon ATV Service & Repair Manual (P/N: 61HN253)

The 2005–2008 Honda TRX500FA and TRX500FGA Rubicon service manual covers Standard and GPScape ATVs, with U.S., Canadian, and U-type market specifications. The publication carries a November 2004 issue date.

• Engine repair: Engine removal and installation, cylinder-head and valve service, camshaft inspection, cylinder/piston repair, and crankshaft and balancer service.

• Hondamatic and sub-transmission: Centrifugal clutch service, Drive/Low/Reverse gear inspection, gearshift linkage adjustment, transmission-control troubleshooting, and the initial setting procedure.

• Fuel and lubrication: VE-type carburetor overhaul, starting-enrichment valve inspection, pilot screw adjustment, oil-pressure testing, and oil-pump and oil-cooler service.

• Cooling system: Radiator pressure testing, thermostat inspection, coolant replacement and air bleeding, and water-pump removal and installation.

• Driveline and chassis: Front differential and rear final-drive repair, backlash inspection, steering and suspension service, hydraulic front disc brakes, and mechanical rear drum brakes.

• Electrical diagnosis: Alternator/starter clutch service, charging and ignition tests, electric starter repair, lights/meters/switches inspection, and selectable 4WD and GPScape troubleshooting.

• Technical references: Factory torque tables, lubricant requirements, wear limits, electrical test specifications, wiring diagrams, cable and harness routing drawings, and problem-code blinking charts.

Written for qualified professional technicians, this manual assumes the training, tools, and equipment needed for the service and repair procedures it describes.

Engine, Carburetor, and Cooling Service

The top-end chapters include valve-guide replacement, valve-seat refacing, and inspection limits for the rocker arms, cam followers, cylinder, piston, and rings. Cylinder-head, camshaft, cylinder, and piston service is documented with the engine installed in the frame.

Assembly information includes bolt-tightening sequences and component orientation. The cylinder-head cover instructions warn that tightening the cover with the rocker arms misaligned with the push rods can cause severe engine damage.

The fuel section distinguishes VE6AE carburetors for A/CM types from VE6AF carburetors for U types. It covers the vacuum piston and diaphragm, primer mechanism, float inspection, and the U-type air cut-off valve, alongside emission-control system schematics.

Cooling-system flow drawings accompany leak testing and circulation-system service. The coolant guidance identifies premature water-pump seal wear and blocked radiator passages as risks associated with silicate-containing coolant.

Hondamatic Diagnostics and Driveline Repair

Factory troubleshooting trees address the control motor, angle sensor, throttle position sensor, switches, and associated wiring. These checks help distinguish an electrical control fault from a mechanical transmission problem before replacement parts are selected.

The Hondamatic section explains problem-code retrieval and erasure, fail-safe behavior, and initial setting requirements after specified sensor or throttle-system work. Connector-location views and the circuit diagram support those diagnostic procedures.

The automatic transmission unit is replaced as an assembly; internal disassembly is expressly excluded. Removing it requires engine removal and crankcase separation. The separate sub-transmission chapter covers gear, bushing, shift-fork, and shift-drum inspection.

Front and rear driving-mechanism chapters include shim selection, backlash checks, and gear-tooth contact-pattern views. Front differential service also covers limited-slip torque inspection and identifies inspection tool 07KMK-HC50101, or 07KMK-HC5010A for U.S. applications.

Suspension, Wiring, and GPScape Details

Chassis procedures extend to knuckle bearings, suspension-arm ball joints, steering-shaft bearings, swingarm pivots, and hydraulic brake bleeding. The front shock-absorber instructions distinguish the earlier lower-pivot bearing arrangement from the later bushing arrangement.

Separate wiring diagrams cover Standard and GPScape configurations, regional equipment differences, and earlier and later electrical layouts. The electrical chapters include charging-system fault tracing, ignition peak-voltage tests, starter-motor inspection, and selectable 4WD diagnosis involving the speed sensors and front final clutch.

GPScape troubleshooting distinguishes receiver communication errors from slow position acquisition, with checks for receiver power, ground, and backup voltage.

Observe Honda’s safety precautions for hot coolant, fuel handling, and supporting the ATV during brake or suspension repair.

A Preview of Compression, Idle, and Coolant Specifications

These examples are a small selection of the engine test and cooling-system data in the manual.

Cylinder compression is specified at 608–902 kPa at 450 rpm, with the engine warm and the throttle fully open. The idle-speed specification is 1,400 ± 100 rpm with the engine warm and the transmission in neutral.

Cooling specifications distinguish the radiator-and-engine capacity of 1.7 liters from the separate 0.40-liter reserve-tank capacity.

PDF Search, Navigation, and Page Breakdown

Text search and diagram detail: Main service text is searchable; lettering within wiring-diagram images is not. The 540 embedded bookmarks use sequential page numbers rather than chapter names. Some small connector markings and wire-color labels remain partly illegible even when enlarged.

Supplied as one printable 541-page PDF: 521 pages of service and reference material, one cover, three blank preliminary pages, and 16 memo pages. All are included in the total.