Market Segment:
Mid-size utility ATV, positioned for recreational and hunting applications.
Key Selling Points:
Reliability, 4WD capability, IRS for improved comfort and handling, Yamaha's proven engine technology, dedicated HUNTER package.
Primary Competitors:
Honda FourTrax 350/420, Polaris Sportsman 400/500, Kawasaki Brute Force 300/400, Suzuki KingQuad 300/400.
Vehicle Key Features:
Independent Rear Suspension (IRS), On-Command 4WD, sealed front drive, rugged chassis, liquid-cooled engine, digital instrumentation, ample cargo racks.
Engine Systems:
Engine overhaul, top-end repair, bottom-end repair, lubrication system, cooling system, fuel system, ignition system, starting system, exhaust system.
Drivetrain Systems:
Transmission (CVT) inspection and repair, drive shaft, differentials (front and rear), hub assemblies, wheel bearings, drive belts.
Suspension Steering Systems:
Independent Rear Suspension (IRS) components, front suspension, steering linkage, tie rods, ball joints, shock absorbers, control arms.
Braking Systems:
Hydraulic brake system, brake calipers, brake pads, brake discs, master cylinder, brake lines, parking brake.
Electrical Systems:
Wiring diagrams, charging system (stator, regulator/rectifier), battery maintenance, lighting system, ignition switch, kill switch, starter motor, fuses, relays.
Fuel System:
Carburetor (Mikuni BSR33) tuning and overhaul, fuel pump, fuel filter, fuel tank and lines.
Body Frame Chassis:
Frame inspection, body panels, fenders, racks, seat, handlebars, footpegs.
Routine Maintenance:
Oil change intervals and specifications, filter replacements (oil, air), spark plug replacement, valve clearance adjustment, lubrication points.
Troubleshooting:
Diagnostic procedures for common performance issues, starting problems, electrical faults, and drivability concerns.
Repair Procedures:
Step-by-step instructions for component disassembly, cleaning, inspection, repair, and reassembly of all major systems.
Overhaul Procedures:
Complete engine and transmission overhaul instructions, including piston and ring replacement, bearing checks, and seal replacements.
Adjustment Procedures:
Carburetor adjustments, throttle cable adjustment, brake adjustments, clutch engagement adjustments.
Depth:
Comprehensive: Covers everything from basic rider maintenance to full engine and transmission rebuilds, including electrical diagnostics.
Engine Type:
4-stroke, SOHC, 2-valve, single cylinder
Bore X Stroke:
83.0 mm x 64.5 mm
Cooling System:
Liquid-cooled
Horsepower Estimate:
Approximately 21-23 hp (at 6,000 RPM)
Torque Estimate:
Approximately 20-22 lb-ft (at 4,500 RPM)
Fuel Delivery:
Carburetor (Mikuni BSR33)
Fuel Type:
Unleaded gasoline (87 octane recommended)
Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher
Oil Capacity:
Approximately 1.7 L (1.8 US qt) with filter change
Ignition Type:
CDI (Capacitor Discharge Ignition)
Spark Plug Type:
NGK CR6HSA (or equivalent)
Spark Plug Gap:
0.6-0.7 mm (0.024-0.028 in)
Transmission Type:
Automatic (Yamaha Ultramatic® CVT with engine braking)
Drive System:
Shaft drive, On-Command® 2WD/4WD with differential lock
Gear Reduction:
High and Low range, Neutral, Reverse
Transmission Fluid Type:
Yamaha Gear Oil (or equivalent) SAE 80 API GL-4
Transmission Fluid Capacity:
Approximately 0.2 L (0.21 US qt)
Safety Certifications:
While ATVs are not typically crash-tested like cars, this manual will cover safety features and operating guidelines to ensure safe usage.
Braking System:
Hydraulic disc front and rear, with sealed drum parking brake.
Engine Braking:
Yamaha's Ultramatic® CVT provides reliable engine braking for descents.
Chassis Design:
Durable steel frame designed for stability and load-bearing.
Ergonomics:
Comfortable seating position, accessible controls, and footwells designed for rider security.
Infotainment System:
Basic digital instrumentation: speedometer, odometer, trip meter, hour meter, 2WD/4WD indicator, fuel gauge. No advanced infotainment features.
Driver Assistance Features:
Yamaha Ultramatic® CVT with engine braking. On-Command® 4WD system with differential lock.
Connectivity Features:
N/A (No electronic connectivity features for external devices).
Initial Service:
First service typically recommended at 100 miles or 1 month, covering engine oil change, drivetrain oil check, and general inspection.
Regular Oil Change:
Every 100 hours or 6 months (whichever comes first) for engine oil and filter.
Air Filter Cleaning Replacement:
Inspect every 50 hours or 3 months; clean/replace as needed, more frequently in dusty conditions.
Spark Plug Replacement:
Every 200 hours or 1 year.
Valve Clearance Adjustment:
Every 200 hours or 1 year.
Drivetrain Oil Change:
Every 200 hours or 1 year.
Engine Oil Spec:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher
Brake Fluid Spec:
DOT 3 or DOT 4 hydraulic brake fluid
Drivetrain Oil Spec:
Yamaha Gear Oil (or equivalent) SAE 80 API GL-4
Common Wear Items:
CVT belt wear, brake pad wear, wheel bearing wear, spark plug fouling (if maintenance is neglected).
Potential Electrical Issues:
Degradation of stator or regulator/rectifier over time, requiring replacement. Corrosion in connectors.
Carburetor Tuning:
May require periodic adjustment or cleaning, especially after prolonged storage or fuel contamination.
Brand Focus:
Yamaha has a long-standing reputation for producing reliable, high-performance powersports vehicles, including a strong lineage of ATVs.
Predecessor Models:
The Grizzly 350 is an evolution of Yamaha's popular utility ATV line, building upon the success of models like the Timberwolf and Bruin.
Key Advancements For 350:
Introduction of IRS on a 350cc platform, enhancement of 4WD system, and refinement of the liquid-cooled engine for better performance and reliability.
Manufacturing Location:
Primarily manufactured in Japan and/or the United States by Yamaha Motor Corporation.
