Target User:
Owners of Honda FourTrax 300 and TRX300EX/Sportrax models seeking to perform their own maintenance and repairs.
Value Proposition:
Provides a highly detailed and comprehensive resource that enables DIY mechanics and owners to maintain and repair their ATVs effectively, saving on professional service costs.
Unique Selling Points:
Extensive coverage of multiple model years and variants, detailed step-by-step instructions with visual aids (pictures/diagrams), and unlimited printing/saving rights.
Model Years Covered:
1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000 (for TRX300/TRX300FW); 1993-2009 (for TRX300EX/Sportrax, TRX300X)
Type:
Repair and Service Manual
Engine:
Complete overhaul, internal components, cooling system, lubrication system, ignition system, fuel system, exhaust system.
Transmission:
Clutch, gearbox, drive shafts, differential (where applicable), final drive.
Chassis:
Frame, suspension (front and rear), steering system, wheels, tires, brakes (front and rear).
Electrical:
Wiring diagrams, lighting, battery, charging system, starter motor, ignition coils, sensors, switches.
Bodywork:
Body panels, fenders, racks, seating.
Maintenance:
Routine inspections, oil changes, filter replacements, chain adjustments, brake adjustments, lubrication points.
Troubleshooting:
Diagnostic guides for common problems, fault finding procedures, electrical system diagnosis.
Repair Rebuild:
Complete tear-down and reassembly instructions for all major components, including engine, transmission, and suspension.
Part Diagrams:
Exploded views with part identification for assembly and ordering.
Depth:
Comprehensive, covering basic maintenance to full engine and transmission rebuilds. Includes detailed torque specifications and clearances.
Engine Type:
Air-cooled, four-stroke, OHV V-twin (Note: TRX300 is typically a single-cylinder, OHV, 4-stroke. The manual might cover both single and potential V-twin variants of the broader FourTrax line if applicable.)
Displacement:
282 cc (for TRX300 models)
Bore X Stroke:
74.0 mm x 65.0 mm (for TRX300 models)
Horsepower:
Approximately 20-23 hp (varies by year and exact model)
Torque:
Approximately 17-19 lb-ft (varies by year and exact model)
Carburetion:
Single Carburetor (e.g., Keihin 34mm CV for TRX300)
Fuel Type:
Unleaded Gasoline 87 Octane Minimum
Ignition Type:
CDI (Capacitor Discharge Ignition)
Cooling Method:
Air-cooled
Oil Type:
API Service SG or higher, SAE 10W-30 recommended (check manual for specific conditions)
Oil Capacity:
Approx. 1.8 L (1.9 US qt) with filter change (check manual for specific model)
Length:
Approx. 75.2 inches (1910 mm)
Width:
Approx. 41.7 inches (1059 mm)
Height:
Approx. 43.7 inches (1110 mm)
Wheelbase:
Approx. 48.0 inches (1219 mm)
Curb Weight:
Approx. 465 lbs (211 kg) for TRX300FW
Towing Capacity:
Not typically specified for this model class; focus on cargo capacity.
Front Rack Capacity:
Approx. 45 kg (99 lbs)
Rear Rack Capacity:
Approx. 85 kg (187 lbs)
Atv Safety:
ATVs are inherently less stable than other vehicles. Always wear a helmet and appropriate protective gear. This manual focuses on mechanical safety and repair, not user operational safety guidelines typically found in an Owner's Manual.
Braking System:
Front: Dual hydraulic disc brakes; Rear: Single hydraulic disc brake.
Lighting:
Headlight, taillight/brake light.
Engine Oil Change:
Every 1,000 km (600 miles) or 6 months, whichever comes first. (Refer to manual for exact interval)
Air Filter Cleaning:
Every 600 km (370 miles) or 3 months; replace as needed.
Spark Plug Replacement:
Every 4,000 km (2,500 miles) or 24 months.
Engine Oil Specification:
API Service SG or higher, SAE 10W-30.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Common Wear Items:
Carburetor adjustments/cleaning, swingarm bushings, starter motor reliability, drive shaft boots (on 4x4 models).
Electrical Common Failures:
CDI unit, voltage regulator, and stator coil can be points of failure with age and mileage.
Valve Adjustment:
Recommended every 4,000 km (2,500 miles) or 24 months for optimal performance and engine longevity.
Carburetor Cleaning:
Essential for smooth running, particularly if the ATV has sat for extended periods. Manual covers jet sizes and float height adjustments.
Honda Atv Legacy:
Honda pioneered the All-Terrain Vehicle (ATV) with the launch of the US90 in 1970. The FourTrax line has a long history of reliability and innovation.
Fourtrax 300 Lineage:
The TRX300 and TRX300FW were foundational models in Honda's utility ATV lineup, known for their ruggedness and utility, especially the 4WD variants.
Trx300Ex Introduction:
The TRX300EX, introduced in 1993, was a sport-oriented ATV that leveraged the reliable 282cc engine from the FourTrax line but with a focus on performance and maneuverability.
Manufacturing Era:
Key production years for the TRX300/TRX300FW covered by this manual are 1988-2000. The TRX300EX production extended much further, up to 2009.
