1986–1988 Honda TRX200SX FourTrax ATV Service & Repair Manual (P/N 61HB302)

This Honda service manual covers the 1986–1988 TRX200SX FourTrax ATV, with maintenance, troubleshooting, and repair procedures for the engine, drivetrain, chassis, and electrical systems.

• Engine repair: Engine removal and installation, cylinder-head disassembly, valve-seat refacing, camshaft timing, and cylinder, piston, and ring inspection.

• Lubrication and maintenance: Oil-pump inspection, centrifugal oil-filter rotor and screen service, maintenance schedules, control-cable checks, and drive-chain adjustment.

• Clutch and transmission: Centrifugal and manual clutch service, clutch-lifter inspection, gearshift-linkage repair, crankcase separation, and transmission disassembly.

• Fuel system: Carburetor teardown and assembly, float-level inspection, air-screw adjustment, fuel-tank service, and high-altitude carburetor settings.

• Brakes and chassis: Hydraulic front drum brakes, cable-operated rear drum brakes, bleeding procedures, steering-bearing replacement, and front and rear suspension service.

• Electrical and starting: Recoil-starter repair, alternator and starter-clutch service, CDI diagnosis, charging-system tests, starter-motor inspection, and wiring diagrams.

The manual suits mechanically qualified users with proper workshop tools; its maintenance schedule identifies selected safety-related work recommended for an authorized Honda dealer.

Engine, Cylinder Head, and Lubrication

The cylinder head can be serviced with the engine installed. Crankshaft and transmission repair require engine removal and crankcase separation, an important distinction when planning internal engine work.

Inspection data covers camshaft lobes, rocker arms and shafts, valve guides, cylinder wear, and piston-ring clearances. Valve-seat refacing is documented; the manual specifies replacement for burned or badly worn valve faces and prohibits grinding them. Its cylinder-head cautions also address loss of valve-spring tension from excessive compression.

The forced-pressure, wet-sump lubrication system is documented with an oil-circuit illustration, temperature-based viscosity chart, pump-rotor inspection limits, and lubrication-point drawings. Separate torque tables cover engine and chassis fasteners.

Clutch Operation and Internal Transmission Repair

The semi-automatic system is documented through separate centrifugal-clutch, manual-clutch, and lifter-mechanism procedures. Its troubleshooting tables distinguish clutch slip, creeping at idle, failure to disengage, and gearshift faults, helping narrow the inspection before parts are replaced.

Internal transmission coverage extends to shift forks, drum grooves, gear engagement dogs, bushings, and shaft clearances. Assembly views show the mainshaft and countershaft layouts. The clutch procedures identify holder 07GMB-HB30100 and puller 07GMC-HB30100.

PD63A Carburetor Service

The fuel-system chapter identifies the PD63A carburetor and covers throttle-valve components, jets, choke operation, and float-valve inspection. Float-level checking uses gauge 07401-0010000; an out-of-specification float calls for replacement.

Air-screw adjustment and high-altitude settings receive separate instructions. A carburetor-specific caution addresses damage to the air-screw seat from overtightening.

Drum Brakes, Steering, and Suspension

Front-brake procedures include wheel-cylinder and master-cylinder bore and piston checks, shoe inspection, hydraulic filling, and bleeding. Rear-brake coverage includes the brake cam, wear indicator, cables, and pedal.

Chassis work extends to kingpin and knuckle bushings, tie-rods, steering bearings, rear axle bearings, and swing-arm pivot bushings. Shock-absorber procedures identify the required spring-compressor equipment.

ATV service requires stable support and adequate ventilation; the brake chapters also address dust exposure and brake-fluid handling.

Ignition, Charging, and Fault Diagnosis

CDI ignition timing is factory preset. The manual provides timing checks and separate resistance tables for SHINDENGEN and OKI CDI units, with tester requirements because unsuitable meters can produce misleading readings.

Battery inspection, charging-output tests, regulator/rectifier checks, and alternator-coil tests accompany starter-motor brush, commutator, and relay inspection.

Reference drawings include the Ignition System, Battery/Charging System, and Starter System circuits, plus the full Wiring Diagram and switch-continuity charts. Cable and harness routing drawings support reassembly. Troubleshooting charts address hard starting, power loss, poor running at low or high speeds, and handling problems.

A Preview of Valve, Oil, and Chain Specifications

These maintenance values illustrate a small selection of the adjustment and capacity data included in the manual. Intake and exhaust valve clearance is 0.08 mm (0.003 in) with the engine cold, below 35°C/95°F.

Engine-oil capacity is 1.6 liters after draining and 1.9 liters after disassembly, distinguishing an oil change from filling after internal repair. Drive-chain inspection specifies 30–35 mm of slack midway between the sprockets, with the engine stopped and the transmission in neutral.

PDF Search, Bookmarks, and Page Contents

Search and diagram detail: OCR text search works through much of the manual, but one cylinder-head page has no text layer and wiring-diagram labels are inconsistently recognized. Embedded bookmarks link to the chapters and full wiring diagram. Small wiring labels need zooming; some remain slightly soft.

Supplied as one printable, English-language, 211-page PDF. The total already includes the cover, two introductory pages, and nine memo pages.