1987 Yamaha Moto 4 350 Manual PDF

The 1987 Yamaha Moto 4 350 is a four-wheel ATV featuring a 348cc air-cooled four-stroke engine, shaft drive, electric start, reverse gear, full floorboards, front and rear racks, dual headlights, and independent front suspension. This manual covers safety information, specifications, maintenance procedures, troubleshooting, and repair instructions for proper operation and service of your Yamaha Moto 4 350 ATV.

1. Features at a Glance 2. Safety Information 3. Specifications 4. Operation Instructions 5. Maintenance Schedule 6. Engine Service 7. Electrical System 8. Brake System 9. Troubleshooting 10. Warranty Information 11. Parts Catalog

Features at a Glance

Key components: 348cc four-stroke engine, shaft drive system, electric start with backup recoil, reverse gear, full floorboards, front and rear cargo racks.

FeatureDescription
Engine Type348cc air-cooled 4-stroke SOHC
Starting SystemElectric with auxiliary recoil
Drive SystemShaft drive
Transmission5-speed with reverse
Suspension FrontIndependent double wishbone
Suspension RearSwingarm with dual shocks
Brakes FrontDual hydraulic discs
Brakes RearSingle hydraulic disc
Fuel Capacity3.7 gallons (14 liters)
Weight462 lbs (210 kg)

Safety Information

Always wear approved helmet, eye protection, and protective clothing. Never operate under influence of alcohol or drugs.

  1. Pre-ride inspection: Check tires, brakes, controls, lights before each ride.
  2. Riding techniques: Keep both hands on handlebars, both feet on footrests.
  3. Load limits: Do not exceed 330 lbs total cargo capacity.
  4. Terrain awareness: Avoid steep slopes and rough terrain beyond vehicle capability.

WARNING! ATVs can be hazardous to operate. Never carry passengers. Never ride on paved surfaces.

Specifications

Operation Instructions

Starting procedure: Set parking brake, shift to neutral, turn key ON, pull choke (cold engine), press start button.

  1. Warm-up: Allow engine to warm for 2-3 minutes before riding.
  2. Shifting: Use clutch for smooth gear changes. Reverse gear limited to 5 mph.
  3. 4WD operation: Engage 4WD lever for difficult terrain only.
  4. Storage: Use fuel stabilizer for long-term storage.

CAUTION! Always use parking brake when stopped on inclines.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Service ItemEvery 100 miEvery 500 miEvery 1000 mi
Engine Oil Change✓
Oil Filter✓
Air Filter Clean✓
Spark Plug✓
Brake Fluid✓
Drive Shaft Lube✓
Wheel Bearing Check✓

Engine Service

Engine oil capacity: 2.5 quarts with filter change. Use SAE 10W-40 motorcycle oil.

  1. Oil change: Warm engine, drain plug underneath, replace crush washer.
  2. Valve clearance: Intake 0.004-0.006 in, exhaust 0.006-0.008 in.
  3. Carburetor adjustment: Pilot screw 1-3/4 turns out from lightly seated.
  4. Spark plug: NGK DR8ES, gap 0.028-0.031 in.

Tip: Always torque cylinder head bolts to 20 ft-lbs in crisscross pattern.

Electrical System

Battery: 12V 14Ah, charging voltage 13.5-15V at 5000 RPM.

  1. Battery maintenance: Check electrolyte level monthly, keep terminals clean.
  2. Fuses: Main 30A, headlight 10A, signal 10A under seat.
  3. Bulb replacement: Headlight 45/40W, brake/tail 21/5W.
  4. Stator output: 14V AC at idle, increasing with RPM.

WARNING! Disconnect battery before electrical service to prevent shorts.

Brake System

Hydraulic disc brakes front and rear. Fluid type: DOT 4.

  1. Pad inspection: Replace when thickness below 1/8 inch.
  2. Bleeding procedure: Use clear tube, pump lever, open bleeder, close when fluid clear.
  3. Rotor thickness: Minimum 0.16 inch front, 0.14 inch rear.
  4. Parking brake: Adjust cable at lever for proper engagement.

CAUTION! Brake fluid damages paint - wipe spills immediately.

Troubleshooting

SymptomPossible CauseCorrective Action
Hard startingDirty carb, weak batteryClean carburetor, charge/test battery
Poor performanceClogged air filter, bad plugReplace air filter, check spark plug
Electrical failureBlown fuse, bad connectionCheck fuses, clean connections
Brake dragStuck caliper, contaminated fluidRebuild caliper, flush brake system
4WD not engagingCable adjustment, mechanical bindAdjust cable, lubricate mechanism

Reset: Disconnect battery for 30 minutes to reset ECU if applicable.

Warranty Information

Limited warranty: 6 months from purchase date. Coverage excludes normal wear, improper maintenance, accidents, or modifications. Keep purchase receipt for warranty claims. Yamaha Motors USA, 6555 Katella Avenue, Cypress, CA 90630.

Parts Catalog

Genuine Yamaha parts recommended for optimal performance and safety. Common part numbers:

Contact Yamaha dealer for parts ordering and technical support.

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