Honda FourTrax TRX300 / TRX300FW ATV Service Manual, 1995–2000

Honda’s factory service manual covers the 1995–2000 FourTrax TRX300 (2WD) and TRX300FW (4WD), with model-specific repair procedures and separate information for ’95–’97 and after-’97 machines.

PDF Bookmarks, Diagram Detail and Page Count

Search, navigation and wiring detail: PDF text search is not available. Embedded bookmarks cover the contents and all numbered sections. Small wiring labels require zooming; some dense connector labels and optional-circuit details remain soft at higher magnification.

One printable, English-language 353-page PDF includes three opening pages—cover, safety notice and usage/contents—and six memo pages within that total.

Engine Overhaul, Driveline Repair and Electrical Diagnosis

These selected repair topics show the manual’s scope rather than reproduce its full contents. Additional subjects include spark-arrester cleaning and headlight-aim adjustment.

• Engine repair: Engine removal and installation, cylinder-head and valve-train service, valve-guide replacement, valve-seat refacing, cam-chain timing, and cylinder/piston repair.

• Fuel system: Fuel-tank and air-cleaner housing removal, carburetor disassembly and assembly, float-level inspection, pilot-screw adjustment, and high-altitude setup.

• Clutch and transmission: Centrifugal and change-clutch repair, oil-pump and kick-starter service, gearshift-linkage repair, crankcase separation, and transmission inspection.

• Steering, suspension and brakes: Model-specific front-arm and knuckle procedures, shock-absorber service, hydraulic front-brake bleeding, wheel-cylinder repair, and rear-brake service.

• Front and rear driveline: Rear axle, drive shaft and final-drive repair, plus dedicated TRX300FW front drive-shaft, differential, gear-case and side-shaft procedures.

• Electrical troubleshooting: Ignition, charging, starter, lighting and oil-warning diagnosis, with peak-voltage tests, system diagrams, troubleshooting charts and year-specific wiring diagrams.

• Workshop references: Component torque tables, fluid capacities, transmission gear ratios, wear limits, gear-contact specifications, electrical test data, special-tool numbers and assembly drawings.

This manual suits mechanically qualified owners and technicians with suitable tools and measuring equipment; it assumes standard workshop knowledge, and the maintenance schedules reserve certain safety-related work for a Honda dealer.

Model and Year Differences

Separate maintenance schedules distinguish the two drive configurations and the ’95–’97 and after-’97 versions. Fuel-system information identifies the VE91C carburetor and the after-’97 California-type VE91D, alongside California crankcase-emission routing and label information.

These distinctions help match service information to the machine before work begins. Engine-removal instructions identify the additional front-drive components involved on the TRX300FW, while separate wiring diagrams account for the electrical changes after ’97.

Engine and Carburetor Repair

Top-end work: Step-by-step procedures cover cylinder-head cover disassembly, rocker arms and shafts, camshaft and cam-chain tensioner service, valve guides, valve seats, and piston/ring installation. Inspection data address compression, camshaft and rocker-arm wear, valve-guide clearance, cylinder taper and out-of-round, piston clearance, and ring end gaps.

The cylinder-head section permits its covered service work with the engine installed. Crankshaft, balancer, transmission and output-gear work require engine removal; crankshaft and transmission repair also require crankcase separation.

Carburetor detail: Starting-enrichment valve, float-valve, jet, primer and vacuum-piston/diaphragm inspections accompany the disassembly and assembly procedures. Troubleshooting tables connect hard starting, rough idle, acceleration misfire, afterfiring, rich or lean running, and poor fuel economy with possible causes.

Assembly cautions address diaphragm positioning to avoid pinching and pilot-screw handling to prevent seat damage.

Clutch, Transmission and Gear Setup

The clutch chapter treats the centrifugal clutch and change clutch separately, together with the primary drive gear, reverse-lock mechanism, oil pump, kick starter and right crankcase cover.

Further procedures cover starter-reduction gears, flywheel and starter clutch, alternator and ignition-pulse-generator replacement, gearshift linkage, crankshaft/balancer installation and crankcase assembly. Output-gear repair includes backlash measurement, tooth-contact pattern checks and shim selection.

The manual warns that reversed oil-filter installation can severely damage the engine and identifies the centrifugal-clutch lock nut’s left-hand thread to avoid crankshaft-thread damage.

Chassis, Brakes and Four-Wheel Drive

Chassis work: Handlebar and throttle-housing service leads into model-specific tie-rod, knuckle and front-arm procedures, steering-shaft bearing replacement, shock-absorber service, wheels/tires and swingarm pivot bearings. Bodywork instructions cover the front bumper, carriers, fenders and muffler.

Brake repair: Coverage includes the master cylinder, front brake shoes, wheel cylinders and adjusters, waterproof-seal inspection, fluid replacement and bleeding. Rear-brake procedures address the drum, shoes, cam, cables and pedal.

TRX300FW front drive: Differential service extends to clutch-pack inspection, limited-slip torque testing, ring-and-pinion contact patterns and backlash adjustment. Front gear-case, propeller-shaft and side-shaft procedures accompany drive-shaft and boot service; the outboard drive-shaft joint is not designed for disassembly.

Rear driveline sections cover axle removal and inspection, drive-shaft service, final-drive bearings, seals and gear setup.

Electrical Tests, Drawings and Tools

No-spark troubleshooting links the ignition control module, coil, pulse generator and alternator AC-sensor circuit. Charging diagnosis separates battery condition, leakage current, charging-coil faults and regulator/rectifier checks. Starter-motor inspection and assembly accompany relay, diode and neutral-circuit tests.

Lighting and warning-system coverage includes headlights, taillight, indicator lamps, ignition and handlebar switches, neutral/reverse switches, the oil-temperature sensor and alarm unit. General troubleshooting charts also address low power, poor running and handling complaints.

Visual references include the lubrication circuit, cable/harness routing, carburetor and cylinder-head exploded drawings, clutch/oil-pump/kick-starter layout, differential/final-drive assembly views and wiring diagrams.

Honda tool references include float-level gauge 07401-0010000, valve-spring compressor 07757-0010000, clutch holder 07GMB-HA70100, rotor puller 07933-3950000 and differential inspection tool 07KMK-HC5010A.

Support the ATV securely, isolate electrical power where required, and keep fuel vapor away from ignition sources. Follow the manual’s precautions for engine, brake, steering and driveline work.

Preview of Valve-Clearance and Carburetor Check Data

The valve-clearance section specifies 0.15 mm (0.006 in) for both intake and exhaust with the engine cold, below 35°C (95°F).

Carburetor inspection lists a float-level specification of 18.5 mm (0.73 in). The float is nonadjustable; the manual specifies float-assembly replacement when its level falls outside the specification.