Target Audience:
Owners, DIY mechanics, and professional service technicians working on Yamaha YFM350X Bruin Wolverine 350 and YFM400FA Kodiak ATVs.
Value Proposition:
Provides essential information for maintaining, diagnosing, and repairing these specific Yamaha ATV models, enabling cost savings and ensuring proper operation.
Competitors:
Other service manuals or repair guides for the same model years and platforms.
Comprehensiveness:
Covers all aspects of vehicle repair and maintenance for the specified model years.
Practicality:
Digital format allows for easy access, searching, and printing of relevant sections.
Engine Systems:
Engine assembly, disassembly, inspection, repair, tuning, oil, cooling, lubrication, carburetor, fuel injection (if applicable), ignition, exhaust.
Transmission Systems:
Clutch operation, gear shifting mechanisms, transmission disassembly and reassembly, lubrication, internal components.
Drivetrain Systems:
Drive shafts, differentials, CV joints, hubs, wheel bearings, final drive maintenance.
Suspension Systems:
Front and rear suspension components, shock absorbers, A-arms, bushings, springs, adjustment, repair.
Braking Systems:
Hydraulic brake system, master cylinder, brake lines, calipers, brake pads, brake discs, bleeding, adjustment.
Electrical Systems:
Battery, charging system (stator, regulator/rectifier), starter motor, ignition system, lighting, wiring diagrams, fuses, relays.
Fuel Systems:
Fuel tank, fuel lines, fuel pump, carburetor overhaul (for applicable models), fuel filter replacement.
Frame And Body:
Chassis components, body panels, plastics, seat, handlebars, fenders, mounting hardware.
Maintenance Procedures:
Routine maintenance checks, oil changes, filter replacements, spark plug servicing, chain adjustment, lubrication points.
Troubleshooting Guides:
Diagnostic procedures for common performance issues, electrical faults, starting problems, and mechanical failures.
Repair Procedures:
Detailed step-by-step instructions for component removal, installation, and repair for all major systems.
Overhaul Procedures:
Complete rebuild procedures for engines, transmissions, and other complex mechanical assemblies.
Technical Specifications:
Torque specifications, clearances, fluid capacities, electrical values, engine timing, maintenance intervals.
Depth Of Coverage:
Comprehensive from basic maintenance to complete engine and transmission rebuilds, including detailed diagnostics and troubleshooting.
Yfm350X Bruin Wolverine Engine Type:
Air-cooled, 4-stroke, SOHC, 2-valve
Yfm350X Bruin Wolverine Displacement:
348cc
Yfm400Fa Kodiak Engine Type:
Air-cooled, 4-stroke, SOHC, 2-valve
Yfm400Fa Kodiak Displacement:
398cc
Bore X Stroke Yfm350X:
83.0 mm x 64.5 mm
Bore X Stroke Yfm400Fa:
92.0 mm x 73.6 mm
Compression Ratio Yfm350X:
9.2:1
Compression Ratio Yfm400Fa:
8.8:1
Carburetor Yfm350X:
Mikuni BSR33/1 (single carburetor)
Carburetor Yfm400Fa:
Mikuni BSR38/1 (single carburetor)
Fuel Type:
Unleaded gasoline, minimum 87 octane
Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher
Oil Capacity W Filter Change Yfm350X:
Approx. 2.0 L (2.1 US qt)
Oil Capacity W Filter Change Yfm400Fa:
Approx. 2.2 L (2.3 US qt)
Transmission Type:
Constant mesh, 5-speed forward, 1 reverse with automatic clutch
Clutch Type:
Wet, multiple-disc, automatic centrifugal clutch
Final Drive:
Shaft drive, enclosed lubricated chain
Gear Shifting Mechanism:
Foot-operated, 1-N-2-3-4-5
Transmission Oil Type:
Yamalube Gear Oil 80W API GL-4 or equivalent
Transmission Oil Capacity Yfm350X:
Approx. 0.8 L (0.85 US qt)
Transmission Oil Capacity Yfm400Fa:
Approx. 0.8 L (0.85 US qt)
Initial Service:
Recommended at 100-hour or 600-mile interval (Refer to manual for precise schedule).
Engine Oil Change Interval:
Every 100 hours or 6 months, whichever comes first.
Air Filter Cleaning:
Check and clean every 10-20 hours of operation, depending on conditions.
Spark Plug Service:
Inspect and gap every 100 hours or 6 months.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid
Coolant Type:
Mixture of high-quality ethylene glycol based antifreeze and water (50/50 ratio) for air-cooled engines (no coolant specified for these models; manual will confirm if any specific coolant is required for certain components).
Common Wear Items:
Brake pads, tires, suspension bushings, drive chain/sprockets, battery.
Carburetor Issues:
Can be prone to clogging from debris or stale fuel if not maintained; requires regular cleaning and adjustment.
Electrical Connections:
Corrosion in electrical connectors due to exposure to elements is a possibility; manual will guide on inspection and cleaning.