Yamaha Banshee 350 Service Repair Workshop Manual

Yamaha Banshee 350 Service Repair Workshop Manual PDF The Yamaha Banshee 350 (also known as the YFZ350) is one of the most iconic and coveted sport ATVs ever built. Produced from 1987 through 2006 in the United States (and longer in select international markets), the Banshee became the king of sand dunes, motocross tracks, and weekend play trails thanks to its potent liquid-cooled 347cc two-stroke parallel-twin engine. This engine -- essentially derived from Yamahas RZ350 sport motorcycle -- delivered exhilarating performance with its twin Mikuni carburetors, reed valve induction, and power valve system. Combined with its lightweight chassis, long-travel suspension, and aggressive styling, the Banshee set the performance benchmark that every subsequent sport ATV attempted to match. Even decades after production ended, the Banshee commands a devoted following with an entire aftermarket industry dedicated to extracting even more power from its legendary two-stroke twin. Whether you are restoring an original Banshee to stock condition, building a high-performance sand dune ripper, or simply maintaining a reliable trail machine, accurate factory-level service information is essential for keeping this legendary ATV running at its best. SERVICE AND REPAIR SCOPE - Complete engine disassembly with crankcase splitting procedure - Cylinder head removal, power valve cleaning, and inspection - Piston and ring replacement with power valve carbon removal techniques - Crankshaft removal, bearing and seal replacement with crankcase rebuild - Reed valve inspection and replacement with cage flatness check - Dual Mikuni carburetor removal, cleaning, jetting, and synchronization - Exhaust power valve (YPVS) system adjustment and motor testing - CDI ignition system testing with stator coil resistance measurement - Clutch plate inspection, spring measurement, and basket groove checking - 6-speed transmission disassembly, gear wear inspection, and shift fork check - Oil injection pump adjustment, cable setup, and reservoir servicing - Front A-arm ball joint inspection and bushing replacement - Rear swingarm bearing inspection and replacement - Front and rear shock absorber rebuild with nitrogen specifications - Steering stem bearing replacement with proper preload - Hydraulic front dual disc brake pad replacement and caliper rebuild - Rear mechanical brake service and adjustment - Frame crack inspection and weld repair recommendations - Body panel fitment and mounting hardware replacement TECHNICAL SPECIFICATIONS - Engine Type: Liquid-cooled, 2-stroke, parallel twin, reed valve - Displacement: 347cc - Bore and Stroke: 64.0 x 54.0mm - Compression Ratio: Variable based on gasket (approximately 7.3:1 stock) - Carburetion: Twin Mikuni VM26SS carburetors - Power Valve: Yamaha YPVS (Yamaha Power Valve System) - Ignition: CDI - Transmission: 6-speed with manual clutch - Clutch: Wet multiplate - Front Suspension: Independent double A-arm, 210mm travel - Rear Suspension: Swingarm with single shock (linkage or non-linkage) - Front Brakes: Dual hydraulic disc - Rear Brakes: Mechanical drum - Dry Weight: Approximately 170 kg - Fuel Capacity: 10 liters - Oil Injection: Auto-lube with separate 2-stroke oil tank DIAGNOSTIC INFORMATION - Engine seizures or overheating: Verify oil injection pump output and cable adjustment, check carburetor jetting for leanness, inspect power valve for sticking open, verify coolant level and thermostat function, check for air leaks at crankcase seals - Uneven power delivery between cylinders: Synchronize twin carburetors using vacuum gauges, check reed valve petal condition on both sides, inspect exhaust power valve timing on each cylinder, verify compression is equal across both cylinders - Clutch slippage under hard acceleration: Check clutch spring free length, measure friction plate thickness, inspect clutch basket fingers for notching, verify steel plate flatness - Transmission jumps out of gear: Inspect engagement dogs and grooves for rounding, check shift fork for bending, verify shift drum stopper arm spring tension, examine output shaft bearing for play - Front suspension knock: Inspect A-arm ball joints for play with pry bar method, check control arm bushings for tearing, verify ball joints are greased, check wheel bearing condition - Brake fade or grab: Check pad material for glazing, inspect disc for warpage specification, bleed brake system removing all air, caliper slide pin movement check, verify master cylinder piston boot condition - Poor idling or off-throttle hesitation: Clean pilot jets in both carburetors, check intake boot for cracks and air leaks, adjust pilot mixture screws to factory base setting, verify reed valve petal seal against cage ILLUSTRATIONS AND DIAGRAMS INCLUDED - Engine full exploded view with crankcase halves detail - Crankshaft cross-section with bearing and seal locations - YPVS power valve mechanism with servo motor wiring - Carburetor cross-section with jet identification chart - Chassis and suspension exploded views - Wiring diagram with CDI and lighting circuits - Frame dimensional specifications with stress points - Complete torque specification reference tables - Parts diagrams with all component part numbers COMPATIBILITY - Covers Yamaha Banshee 350 YFZ350 all production years - Includes US, Canadian, and international variants - English language manual FILE PROPERTIES - Format: Searchable PDF - Language: English - Delivery: Instant digital download - Access: Download anytime after purchase