1987 Yamaha Banshee Service Manual Free Download
The 1987 Yamaha Banshee is a high-performance ATV featuring a 347cc liquid-cooled two-stroke twin-cylinder engine, 6-speed transmission with reverse, Torque Induction intake system, front dual A-arm suspension, rear swingarm suspension, dual hydraulic disc brakes, and aggressive styling. This service manual provides comprehensive technical information for maintenance, repair, and troubleshooting. Below are key sections covering specifications, maintenance procedures, engine service, chassis, electrical systems, and troubleshooting.
General Information
Key components: 347cc two-stroke twin-cylinder engine, Torque Induction system, 6-speed transmission with reverse, dual A-arm front suspension, swingarm rear suspension, hydraulic disc brakes.
| Component | Description |
|---|
| Engine Type | Liquid-cooled 2-stroke twin-cylinder |
| Displacement | 347cc |
| Bore x Stroke | 64.0mm x 54.0mm |
| Compression Ratio | 6.5:1 |
| Transmission | 6-speed with reverse |
| Starting System | Kick starter |
| Front Suspension | Dual A-arm with shocks |
| Rear Suspension | Swingarm with single shock |
| Front Brakes | Dual hydraulic disc |
| Rear Brakes | Hydraulic disc |
Specifications
- Engine: 347cc liquid-cooled 2-stroke twin-cylinder
- Fuel System: Twin 26mm Mikuni carburetors
- Ignition System: CDI
- Transmission: 6-speed constant mesh with reverse
- Final Drive: Chain
- Front Suspension: Dual A-arm with hydraulic shocks
- Rear Suspension: Swingarm with single shock
- Front Brakes: Dual hydraulic disc
- Rear Brakes: Hydraulic disc
- Fuel Capacity: 3.2 gallons
- Dry Weight: 386 lbs
Periodic Maintenance
Regular maintenance ensures optimal performance and longevity.
- Engine oil change: Every 6 months or 500 miles
- Spark plugs: Check every 3 months, replace as needed
- Air filter: Clean every 3 months, replace annually
- Chain adjustment: Check every ride, adjust as needed
- Brake fluid: Check monthly, replace annually
- Coolant: Check monthly, replace every 2 years
WARNING! Always use proper safety equipment and work in well-ventilated area.
Engine Service
Detailed procedures for engine maintenance and repair.
- Cylinder head removal: Drain coolant, remove head bolts
- Piston replacement: Remove cylinder, replace rings/piston
- Crankshaft service: Split cases for bearing replacement
- Carburetor adjustment: Sync and tune twin Mikuni carbs
- Cooling system: Flush and refill coolant
- Exhaust system: Remove and clean expansion chambers
CAUTION! Use proper torque specifications when reassembling.
Chassis & Suspension
Frame, suspension, and steering maintenance procedures.
- Front suspension: Check A-arm bushings and ball joints
- Rear suspension: Inspect swingarm bearings and pivot points
- Steering stem: Adjust and lubricate bearings
- Wheel bearings: Check for play and replace if necessary
- Frame inspection: Check for cracks or damage
Tip: Use thread locker on critical fasteners.
Electrical System
Wiring, ignition, and charging system service.
- CDI unit testing: Check spark and timing
- Stator testing: Measure resistance values
- Battery maintenance: Check voltage and connections
- Lighting system: Test headlight, taillight, indicators
- Kill switch: Verify proper operation
WARNING! Disconnect battery before electrical work.
Fuel System
Carburetor service and fuel delivery system.
- Carburetor cleaning: Disassemble and clean jets
- Fuel line inspection: Check for cracks or leaks
- Fuel filter replacement: Replace inline filter
- Float level adjustment: Set to specification
- Throttle cable: Lubricate and adjust free play
CAUTION! Work in well-ventilated area away from ignition sources.
Transmission & Clutch
Gearbox and clutch service procedures.
- Clutch adjustment: Set proper cable free play
- Transmission oil: Drain and refill with specified oil
- Shift mechanism: Inspect shift forks and drum
- Clutch plates: Check for wear and replace as needed
- Reverse mechanism: Test and lubricate
Brake System
Hydraulic brake maintenance and repair.
- Brake pad replacement: Inspect and replace worn pads
- Brake fluid flush: Bleed system and refill
- Rotor inspection: Check for warping or wear
- Caliper service: Clean and lubricate sliding pins
- Brake line inspection: Check for leaks or damage
Troubleshooting
| Symptom | Possible Cause | Corrective Action |
|---|
| Hard starting | Fouled plugs, weak spark | Replace spark plugs; check ignition system |
| Poor performance | Clogged carburetors, compression loss | Clean carbs; check compression; inspect reeds |
| Transmission noise | Worn gears, low oil | Check oil level; inspect transmission |
| Brake fade | Contaminated pads, air in system | Replace pads; bleed brakes |
| Overheating | Low coolant, clogged radiator | Check coolant level; clean radiator fins |
Technical Support: Contact Yamaha customer service for additional assistance.
Parts: Genuine Yamaha parts available through authorized dealers.
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