Primary Coverage:
Comprehensive service, repair, maintenance, and troubleshooting for Yamaha Bruin 350 and 400 models.
Estimated Page Count:
Varies by specific model/engine variant, but extensive (typically 300-600+ pages for complete workshop manuals).
Type:
Workshop Service Repair Manual
Compatibility:
PC & Mac Compatible (Windows 95, 98, 2000, NT, XP, Vista, 7, 8, etc.)
Engine Mechanical:
Engine overhaul, disassembly, reassembly, cylinder head, pistons, crankshaft, timing system, lubrication system.
Engine Fuel System:
Carburetor specifications, tuning, cleaning, fuel pump, fuel lines, fuel tank.
Ignition System:
Ignition timing, spark plugs, ignition coil, CDI unit, troubleshooting.
Cooling System:
Radiator, fan, thermostat, coolant specifications, maintenance.
Exhaust System:
Muffler, exhaust pipes, inspection, replacement.
Transmission Drive:
Automatic transmission (CVT/Ultramatic), clutch system, drive belts, differentials (front/rear), driveshafts, wheel hubs.
Brakes:
Hydraulic brake system, brake fluid specifications, master cylinder, calipers, brake pads, rotors, bleeding procedures.
Suspension:
Front and rear suspension systems, shock absorbers, springs, control arms, bushings, alignment specifications.
Steering:
Steering column, tie rods, steering linkage, steering wheel removal, adjustment.
Electrical System:
Battery, starter motor, alternator/stator, lighting system, wiring diagrams, fuses, relays, switches.
Frame Chassis:
Frame inspection, repair, swingarm, subframe.
Bodywork Trim:
Body panels, fenders, racks, seat, handlebars, removal and installation.
Routine Maintenance:
Oil changes, filter replacements, lubrication, chain adjustment, tire pressure checks.
Engine Repair:
Top-end rebuilds, bottom-end rebuilds, valve adjustments, piston ring replacement, seal replacement.
Transmission Repair:
Drive belt replacement, clutch inspection and replacement, gear oil changes, differential service.
Brake System Service:
Brake pad replacement, rotor resurfacing/replacement, brake bleeding, caliper overhaul.
Suspension Service:
Shock absorber replacement, bushing replacement, steering linkage adjustment.
Electrical Troubleshooting:
Diagnosing starting issues, lighting problems, charging system faults using provided wiring diagrams.
Diagnostic Procedures:
Step-by-step guides for identifying and resolving common issues.
Assembly Disassembly:
Detailed instructions for taking apart and putting back together all major components.
Depth:
Extremely High - Covers everything from basic maintenance to complete engine and transmission rebuilds, including diagnostics and component-level repair.
Diagrams Illustrations:
Includes exploded views, diagrams, schematics, and step-by-step illustrations for clarity.
Specifications:
Detailed technical specifications, torque values, clearances, fluid types, and capacities.
Engine Type:
4-stroke, SOHC, 2-valve, single-cylinder
Bore X Stroke:
83.0 mm x 64.5 mm
Cooling System:
Liquid-cooled
Engine Type:
4-stroke, SOHC, 4-valve, single-cylinder
Displacement Cc:
401cc (for some models, check specific variant)
Cooling System:
Liquid-cooled
Horsepower Approx 350:
Approx. 20-25 hp (varies by tuning and model year)
Torque Approx 350:
Approx. 22-27 Nm (varies)
Fuel Delivery 350:
Carburetor (e.g., Mikuni BSR33/34)
Fuel Capacity:
Approx. 3.3 gallons (12.5 L) including reserve
Ignition System:
Digital CDI
Starting System:
Electric starter
Engine Oil Change:
Every 1,000 km or 6 months, whichever comes first (refer to manual for precise interval).
Air Filter Cleaning:
Every 3 months or 500 km, inspect more frequently in dusty conditions.
Spark Plug Replacement:
Check every 1,000 km, replace as needed or per manual schedule.
Cv Belt Inspection:
Inspect every 1,000 km or 6 months for wear and damage.
Engine Oil Type:
Yamalube 4 (10W-40) or equivalent API SG, JASO MA.
Engine Oil Capacity:
Approx. 2.0-2.1 L (with oil filter change)
Coolant Type:
Permanent type antifreeze (ethylene glycol based, 50/50 mix with distilled water).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Cv Belt Wear:
Like all CVTs, drive belts can wear over time and require replacement. Proper maintenance and avoiding excessive strain can prolong belt life.
Carburetor Cleaning:
Carburetors can sometimes require cleaning or adjustment due to fuel varnish or debris, especially if the ATV sits for extended periods.
Suspension Bushings:
Like many ATVs of this era, suspension bushings can degrade over time, leading to play and requiring replacement.
