Market Position:
The Yamaha Grizzly 350 IRS (YFM35FGI) occupies a strong position in the mid-size utility ATV market, known for its blend of capability, comfort, and Yamaha's renowned reliability. It caters to recreational riders, light agricultural use, and trail exploration.
Competitive Analysis:
Competes with models from Honda (e.g., FourTrax Foreman), Kawasaki (e.g., Brute Force), and Suzuki (e.g., KingQuad) in the 300-400cc class, often differentiated by its IRS system offering a smoother ride.
Key Features:
Independent Rear Suspension (IRS) for improved comfort and ground clearance, reliable 349cc engine, 4WD capability (on applicable models), electric power steering (on some variants not explicitly mentioned but common for IRS models), rugged chassis, and Yamaha's reputation for durability.
Engine Systems:
Engine overhaul, cylinder, carburetor/EFI, fuel injection, piston, connecting rod, crankshaft, valves, valve clearance, camshaft, compression ratio, lubrication, cooling system, intake, exhaust, ignition system, starter system, charging system, magneto, fuel pump, fuel tank, fuel filter, throttle cable, mixture screw, pilot jet, main jet, slow jet.
Drivetrain Systems:
Transmission, drive train, primary reduction gear, clutch, swingarm, drive shaft, axle, gearshift, linkage, torque specs for drivetrain components.
Chassis Suspension Brakes:
Independent Rear Suspension (IRS), front forks, struts, triple trees, wheel, tire, brakes (front and rear rotors/pads), brake system hydraulic components, suspension linkages.
Electrical Systems:
Electrical system, schematic, fuse, battery, switches, lights, rectifier, electronic components, EFI system.
Body Plastics:
Body panels, plastics, fenders, seat, handle, hull.
Maintenance Procedures:
Scheduled maintenance, fluid changes (engine oil, coolant), lubrication, battery maintenance, storage procedures, spark plug replacement, air filter cleaning/replacement, troubleshooting common issues, error code diagnosis.
Repair Procedures:
Complete tear down and rebuild of all major components, engine rebuild, transmission rebuild, suspension repair, brake system repair, electrical diagnostics and repair, carburetor overhaul, EFI system troubleshooting.
Troubleshooting Diagnostics:
Comprehensive troubleshooting guides, error code lookup and resolution, diagnostic procedures for no spark conditions, performance issues, starting problems.
Depth Of Coverage:
Detailed, factory-level repair and maintenance information, suitable for both DIY enthusiasts and professional technicians. Includes torque specifications, part diagrams, and step-by-step instructions for complex procedures.
Engine Type:
Four-stroke, SOHC, single-cylinder
Displacement:
349 cc (21.3 cu. in.)
Bore X Stroke:
83.0 mm x 64.5 mm (3.27 in. x 2.54 in.)
Horsepower:
Estimated 22-24 HP (specific figures may vary slightly by year and emissions regulations)
Torque:
Estimated 20-22 lb-ft (specific figures may vary slightly)
Fuel System:
Carburetor (Mikuni BSR33) or Electronic Fuel Injection (EFI) depending on specific model year/variant. Manual likely covers both or a primary system.
Fuel Tank Capacity:
Approximately 3.2 gallons (12.0 L)
Oil Type:
Yamaha's recommended Yamalube 4W or equivalent SAE 10W-40 API SG or higher motor oil.
Oil Capacity With Filter:
Approximately 1.72 US qt (1.63 L)
Cooling Method:
Liquid-cooled
Coolant Type:
High-quality, permanent type antifreeze solution (e.g., Yamaha's recommended blend or an equivalent ethylene glycol-based coolant with a 50/50 mix with distilled water).
Safety Ratings:
ATVs are not subject to traditional NHTSA or IIHS crash test ratings. Safety is primarily determined by adherence to manufacturer recommendations, proper riding gear, and safe operating practices.
Active Safety Features:
Sealed drum brakes (front), hydraulic disc brakes (rear), engine braking, durable chassis construction.
Passive Safety Features:
Full floorboards, handlebars with protective padding, ergonomic seating position, built-in grab bars.
Infotainment Features:
Basic instrumentation including speedometer, odometer, tripmeter, and indicator lights. No advanced infotainment systems are typically found on this utility-focused model.
Driver Assistance Features:
Electric Power Steering (EPS) was available on some higher-trim variants of the Grizzly 350 IRS, significantly reducing steering effort and fatigue. The manual will detail its operation and maintenance.
Connectivity Features:
None (not applicable to this model).
Initial Service:
First service typically around 100-250 miles or 1 month, including oil change and chain/cable adjustments.
Engine Oil Change:
Every 1000 miles or 12 months, or more frequently under severe usage conditions.
Air Filter Maintenance:
Clean every 1000 miles or 12 months; replace as needed.
Spark Plug Replacement:
Inspect every 1000 miles or 12 months; replace as needed. Recommended replacement interval often around 3,000-5,000 miles.
Coolant Replacement:
Inspect coolant level regularly. Replacement interval typically every 2 years or 24,000 miles, but refer to manual for specific Yamaha recommendation.
Transmission Oil:
Check and maintain correct level. Manual will specify type and capacity for gearbox/differential fluids.
Common Issues:
Typical for ATVs of this era might include carburetor tuning issues (if applicable), potential wear on suspension components over time, and routine maintenance needs like battery care and brake adjustments. The manual's troubleshooting section is crucial for addressing these.
Brand Heritage:
Yamaha has a long and distinguished history in powersports, renowned for engineering excellence, performance, and reliability across motorcycles, ATVs, watercraft, and snowmobiles. The Grizzly line represents their commitment to robust utility and recreational off-road vehicles.
Model Evolution:
The Grizzly 350 IRS followed earlier generations of the Grizzly line, introducing Independent Rear Suspension to a more accessible mid-size model, enhancing ride quality and capability. This generation focused on refining the existing platform with a robust powertrain and a comfortable, capable chassis.
Production Locations:
Yamaha ATVs are typically manufactured in their global facilities, often including plants in Japan and the United States.
