Yamaha GDR155 NVX 155 Scooter Service Manual PDF | 2017-2022

Digital workshop manual for the 2017-2022 Yamaha GDR155 and GDR155-A (NVX 155) scooters, covering full engine overhaul, V-belt CVT service, EFI fuel injection diagnostics, ABS troubleshooting, Smart Key system, and complete electrical circuit diagrams for both variants. Everything a technician needs to maintain, repair, and diagnose these fuel-injected maxi-scooters. Delivered instantly as a fully searchable PDF — works on any device.

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• Fully searchable
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• Everything needed to repair & maintain your scooter
• Troubleshooting instructions, wiring diagrams, and reference material

• Complete engine disassembly and assembly procedures including cylinder head, camshaft, valves, piston, and crankshaft
• V-belt automatic transmission (CVT) service: primary sheave, secondary sheave, clutch shoes, and V-belt replacement
• EFI (fuel injection) system diagnostics with SGCU self-diagnostic function, fault codes, and Yamaha Diagnostic Tool procedures
• Fuel system service: fuel tank, fuel pump, fuel filter, fuel injector, throttle body, and air filter case
• Cooling system overhaul: radiator, thermostat, and water pump disassembly, inspection, and assembly
• Full chassis service: body panel removal, front and rear wheel service, front fork disassembly, steering head, and swingarm
• Front hydraulic disc brake and rear drum brake service including caliper, master cylinder, and brake pad replacement
• ABS (Anti-Lock Brake System) service for GDR155-A: hydraulic unit, ABS ECU, fault codes, and troubleshooting
• Smart Key system service for GDR155-A: circuit diagrams, self-diagnosis, emergency mode, key registration and disabling procedures
• Stop and Start system procedures for GDR155-A including circuit diagrams and troubleshooting
• Complete electrical system coverage: ignition, electric starting, charging, lighting, signaling, and fuel pump circuit diagrams
• VVA (Variable Valve Actuation) solenoid checking and service procedures
• Troubleshooting charts for starting failure, idling, clutch faults, overheating, braking, handling, and lighting issues
• technical specifications and torque tables covering engine, chassis, and general fasteners

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