Category:
All-terrain vehicles (ATVs)
Target Audience:
Yamaha ATV owners, DIY mechanics, service technicians
Competitors:
Honda (FourTrax, Rancher), Suzuki (KingQuad), Polaris (Sportsman), Kawasaki (Bayou, Brute Force)
Manual Benefit 1:
Provides OEM-level accuracy for repairs and maintenance.
Manual Benefit 2:
Enables owners to perform complex repairs, saving on service costs.
Manual Benefit 3:
Digital format offers convenient access and prevents damage to physical manuals.
Manual Benefit 4:
Lifetime protection policy for lost or damaged downloads.
Engine:
Detailed engine overhaul, specifications, tuning, lubrication, cooling system
Transmission:
Clutch, gearbox, drive chain, sprockets, lubrication, maintenance
Fuel System:
Carburetor service, fuel pump, fuel lines, filters, specifications
Electrical System:
Ignition, starting system, charging system, lighting, wiring diagrams, troubleshooting
Suspension:
Front and rear shocks, forks, linkages, maintenance, adjustments
Steering System:
Handlebars, steering stem, tie rods, adjustments, troubleshooting
Brakes:
Hydraulic brake systems, caliper service, master cylinder, fluid specifications, bleeding procedures
Bodywork Chassis:
Frame, body panels, plastics, seat, fenders, removal, installation
Exhaust Intake:
Muffler, exhaust pipe, air filter, intake system maintenance
Routine Maintenance:
Oil changes, filter replacements, spark plug service, chain adjustment, lubrication points
Engine Overhaul:
Piston, cylinder, valve train, crankshaft, seals, gaskets, complete rebuild procedures
Transmission Repair:
Gearbox disassembly, reassembly, clutch inspection and replacement
Electrical Troubleshooting:
Diagnostic procedures, component testing, wiring harness repair, battery service
Suspension Repair:
Shock absorber servicing, fork seal replacement, general suspension component repair
Brake System Service:
Brake pad replacement, caliper servicing, bleeding, fluid replacement
Carburetor Tuning:
Adjustment, cleaning, rebuilding, jetting specifications
Troubleshooting Guides:
Systematic approaches to diagnose and resolve common and complex issues
Depth:
Comprehensive factory-level repair and maintenance information
Detail Level:
Step-by-step instructions, detailed diagrams, torque specifications, special tool requirements
Engine Type:
4-stroke, SOHC, 4-valve
Displacement:
348cc (for YFM400 Kodiak, often referred to as 400cc class)
Engine Type:
4-stroke, SOHC, 4-valve
Displacement:
348cc (for YFM350 Bruin, shares engine with YFM400 in this generation)
Bore X Stroke Yfm400 Yfm350:
83.0 mm x 64.5 mm
Compression Ratio Yfm400 Yfm350:
9.2:1
Horsepower Estimate Yfm400 Yfm350:
Approximately 20-23 HP (specific figures vary by year and tuning, but indicative)
Torque Estimate Yfm400 Yfm350:
Typically around 20-22 lb-ft
Carburetor Yfm400 Yfm350:
Mikuni BSR33/BD-1 (Single Carburetor)
Fuel Type:
Unleaded gasoline (87 octane or higher recommended)
Fuel Tank Capacity Yfm400 Yfm350:
Approximately 3.8 US gal (14.5 L)
Oil Type Yfm400 Yfm350:
Yamalube 4G 10W-40 (or equivalent API SG or higher, SAE 10W-40)
Oil Capacity Yfm400 Yfm350:
Approximately 2.04 US qt (1.9 L) with filter change
Coolant Type:
Yamaha-specific coolant (or equivalent 50/50 mix of ethylene glycol and de-ionized water)
Type:
Automatic (Yamaha Ultramatic® Transmission)
Drive System Yfm400:
On-Command® 4WD, shaft drive
Drive System Yfm350:
2WD, shaft drive
Gear Selection:
High/Low range, Neutral, Reverse
Clutch Type:
Wet, multi-disc automatic centrifugal clutch
Transmission Fluid Type:
Yamalube 4G 10W-40 or equivalent API SG or higher, SAE 10W-40
Length:
Approx. 77.4 inches (1965 mm)
Width:
Approx. 43.7 inches (1109 mm)
Height:
Approx. 45.1 inches (1145 mm)
Length:
Approx. 76.2 inches (1935 mm)
Width:
Approx. 41.3 inches (1049 mm)
Height:
Approx. 44.5 inches (1130 mm)
Dry Weight:
Approx. 556 lbs (252 kg)
Ground Clearance:
Approx. 10.2 inches (260 mm)
Dry Weight:
Approx. 503 lbs (228 kg)
Ground Clearance:
Approx. 8.7 inches (220 mm)
Front Rack Capacity Yfm400:
Approx. 121 lbs (55 kg)
Rear Rack Capacity Yfm400:
Approx. 264 lbs (120 kg)
Front Rack Capacity Yfm350:
Approx. 88 lbs (40 kg)
Rear Rack Capacity Yfm350:
Approx. 176 lbs (80 kg)
Towing Capacity Yfm400:
Approx. 1,124 lbs (510 kg)
Towing Capacity Yfm350:
Approx. 794 lbs (360 kg)
Front Tire Size Yfm400:
AT25x8-12
Rear Tire Size Yfm400:
AT25x10-12
Front Tire Size Yfm350:
AT25x8-12
Rear Tire Size Yfm350:
AT25x10-12
Engine Oil Change:
Every 1,000 km (600 miles) or 6 months.
Oil Filter Replacement:
Every 1,000 km (600 miles) or 6 months (concurrent with oil change).
Air Filter Cleaning:
Every 500 km (300 miles) or 3 months; replace as needed.
Spark Plug Inspection:
Every 1,000 km (600 miles) or 6 months.
Final Drive Oil Change:
Every 2,000 km (1,200 miles) or 12 months.
Engine Oil:
Yamalube 4G 10W-40 API SG or higher
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid
Coolant:
50/50 mix of ethylene glycol and de-ionized water
Carburetor Fouling:
Can occur with infrequent use or poor fuel quality, requiring cleaning and adjustment.
Drive Belt Wear:
While shaft drive, the Ultramatic transmission belt requires periodic inspection and potential replacement based on mileage and usage.
Cv Boot Tears:
Common on ATVs, requiring inspection and replacement to prevent joint damage.
Electrical Connections:
Corrosion can develop on connectors, especially in wet or dirty environments, leading to intermittent electrical issues.
Manufacturer:
Yamaha Motor Company, known for innovation and quality in powersports.
Kodiak Line:
The Kodiak line has been a staple in Yamaha's ATV lineup, emphasizing rugged utility and reliability.
Bruin Line:
The Bruin was positioned as a user-friendly, versatile ATV often favored for recreational and light-duty work.
Production Era:
These models represent Yamaha's mid-2000s ATV offerings, building on proven technologies.
Manufacturing Origin:
Typically manufactured in Japan or North America by Yamaha.
