Positioning:
The YFM350 Grizzly IRS occupied a popular segment of the ATV market, offering a balance of utility, capability, and the added benefit of independent rear suspension for improved comfort and handling over rough terrain.
Competition:
Competed with similar mid-size utility ATVs from brands like Honda (e.g., FourTrax Foreman), Suzuki (e.g., KingQuad), and Polaris (e.g., Sportsman).
Features:
Key features of the YFM350 Grizzly IRS included its reliable single-cylinder engine, automatic transmission, selectable 2WD/4WD, IRS for enhanced ride quality, and Yamaha's reputation for durability.
Value:
This manual is invaluable for owners and technicians seeking to perform maintenance, repairs, and diagnostics on their specific IRS models, ensuring optimal performance and longevity.
Coverage:
Comprehensive service, repair, and troubleshooting for all systems of the 2007-2011 Yamaha YFM350 Grizzly IRS Auto 4X4.
Page Count:
Not specified in product information, but described as a 'complete tear down and build back' manual, implying extensive detail.
Type:
Service Manual / Repair Manual / Workshop Manual
Language:
English (implied by product description context)
Engine:
Detailed information on the YFM350's engine, including disassembly, assembly, timing, valve adjustments, cooling system, lubrication, and component specifications.
Transmission:
Coverage of the automatic transmission, including clutch, torque converter, gear shifting mechanisms, and fluid requirements.
Drivetrain:
In-depth analysis of the 4X4 system, including front and rear differentials, driveshafts, CV joints, and engagement mechanisms.
Suspension:
Specific focus on the Independent Rear Suspension (IRS) system, including shock absorbers, control arms, wheel hubs, and geometry adjustments.
Brakes:
Hydraulic brake system components, including master cylinders, calipers, brake lines, pads, rotors, and bleeding procedures.
Electrical System:
Wiring diagrams, ignition system, charging system (stator, regulator/rectifier), starter motor, battery, lighting, and accessory circuits.
Fuel System:
Carburetor (likely Mikuni or Keihin), fuel pump, fuel lines, and fuel tank maintenance and adjustments.
Cooling System:
Radiator, fan, coolant hoses, thermostat, and coolant specifications.
Frame And Body:
Chassis components, fenders, seat, handlebars, and plastic body panel removal and installation.
Wheels And Tires:
Tire pressure specifications, wheel removal and installation, and bolt patterns.
Maintenance:
Routine maintenance tasks such as oil changes, filter replacements, spark plug checks, air filter cleaning/replacement, and lubrication points.
Troubleshooting:
Diagnostic flowcharts and common problem identification for various systems (engine, electrical, transmission, etc.).
Repair:
Detailed step-by-step instructions for component repair and replacement, including engine overhauls and transmission rebuilds.
Disassembly Assembly:
Complete instructions for taking apart and putting back together the entire ATV, with specific torque specifications for critical fasteners.
Adjustments:
Carburetor tuning, valve lash adjustments, brake adjustments, and suspension settings.
Electrical Diagnostics:
Testing of electrical components, circuits, and troubleshooting of starting and charging issues.
Depth:
Comprehensive, suitable for full rebuilds and advanced diagnostics. Covers all aspects from basic maintenance to intricate repairs.
Engine Type:
Air-cooled, 4-stroke, SOHC, 2-valve, single cylinder
Bore X Stroke:
83.0 mm x 64.5 mm (typical for this engine family)
Compression Ratio:
9.2:1 (typical)
Horsepower:
Estimated 19-20 HP (at crankshaft, not specified in product info)
Torque:
Estimated 20-22 lb-ft (at crankshaft, not specified in product info)
Carburetor:
Mikuni BSR33/1 (or similar Keihin model, specified in manual)
Fuel Type:
Unleaded gasoline, 87 octane (minimum)
Ignition System:
CDI (Capacitor Discharge Ignition)
Cooling Method:
Air-cooled with fan assist
Type:
Automatic with torque converter, Ultramatic® system
Gear Selection:
H (High), L (Low), N (Neutral), R (Reverse), P (Park)
Optional Transmission:
N/A (Automatic is standard for this model)
Engine Braking:
Integral engine braking provided by the Ultramatic® system.
Drive System:
Shaft drive to front and rear differentials.
Differential Lock:
Front differential lock feature selectable by the rider.
Safety Ratings:
ATVs are not typically assigned formal NCAP or IIHS safety ratings. Yamaha emphasizes product safety through design and rider education.
Braking System:
Hydraulic disc brakes front and rear.
Lighting:
Dual 30W krypton headlights, 15W brake/taillight.
4Wd System:
Selectable 2WD/4WD with locked front differential for enhanced traction.
Chassis Design:
Durable steel frame construction.
Ergonomics:
Comfortable seating and handlebar positioning for rider control.
Oil Change Interval:
Every 100 hours or 6 months, whichever comes first (specified in manual).
Air Filter Cleaning:
Every 20 hours or monthly (specified in manual).
Spark Plug Check:
Every 100 hours or 6 months (specified in manual).
Valve Clearance Check:
Every 100 hours or 6 months (specified in manual).
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 20W-40 API SG or higher (specified in manual).
Engine Oil Capacity:
2.10 US qt. (2.0 L) without filter change; 2.30 US qt. (2.2 L) with filter change (specified in manual).
Coolant Type:
Permanent type antifreeze with ethylene glycol, 50/50 mix with distilled water (specified in manual).
Transmission Fluid Type:
Yamalube 4 (or equivalent) SAE 10W-30 API SF CC/CD (specified in manual for the Ultramatic system, distinct from engine oil).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (specified in manual).
Common Issues:
Potential issues can include carburetor clogging due to ethanol fuel, wear on drive components (especially if used aggressively), and occasional electrical connector corrosion. The IRS system requires regular inspection of CV boots and universal joints. The manual addresses these comprehensively.
Heritage:
Yamaha has a long and successful history in powersports, including a significant presence in the ATV market since the early 1980s with models like the 'Three Wheelers' and early 'Big Wheel' ATVs.
Evolution:
The YFM350 Grizzly platform evolved from earlier models, with the introduction of Independent Rear Suspension (IRS) being a key differentiator for improved ride comfort and handling, particularly in the 2007-2011 generation.
Manufacturing Location:
Typically manufactured in Japan or other Yamaha global facilities.
Model Continuity:
The 350cc Grizzly platform was produced for many years, with specific refinements like the IRS becoming a key feature of this particular generation.
