Dedicated Subsystem WorkbenchPlatform Gen: 2009–2026

2016 Yamaha Zuma 125 (YW125) Charging System, Stator AC Output & Battery Health

Stator 3-phase AC voltage at 5,000 RPM, coil resistance, regulated DC voltage, battery code YT7B-BS, CCA rating, and multimeter charging diagnostic steps for 2016 Yamaha Zuma 125 (YW125).

Technical PassportOEM VERIFIED

Engine

125cc

Cooling

Liquid-Cooled (2022–2026) / Forced Air-Cooled with Fan Shroud (2009–2021)

Final Drive

Belt Drive

Engine Oil

0.90 L (0.95 US qt) [0.80 L without filter / periodic change]

Spark Plug

NGK CPR8EA-9

Front Tire

120/70-12 51L Dual-Sport Tread

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Gen 2009–2026

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2009 through 2026.

Select Model Year:(Active: 2016)
18 Production Years (2009–2026)

2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026

Suggested Items3 Verified Workshop Consumables Available for this Job

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3-Phase Charging System & Battery Diagnostic Flowchart

Yuasa & OEM Standards

Multimeter troubleshooting protocols, cold cranking amps (CCA) ratings, 3-phase stator AC outputs, and regulator-rectifier health verification.

Shop YT7B-BS Batteries

OEM Battery Code

YT7B-BS

Cold Cranking Rating

Not Available

Capacity (10HR Rate)

Not Available

Regulated Output Spec

Key-OFF Parasitic Limit

Enter Multimeter DC Voltage Reading

V DC

Multimeter Test Diagnosis

Enter your multimeter terminal reading on the left to view instant diagnostic interpretations and recommended workshop actions.

OEM Factory AGM BatteryOEM Replacement

Dimensions: • Weight: Not Available. Pre-filled absorbed glass mat technology engineered for heavy vibration resistance.

Lithium LiFePO4 UpgradeUp to 70% Lighter

Features built-in RE-START jump starting reserve. Never stranded by dead lights: press the restart button on the top terminal to crank the motorcycle without jumper cables.

Smart Maintainer SpecBattery Life Extension

Standard Charge Rate: . Automated desulfation & float maintenance ensures full capacity retention during off-season winter storage.

Recommended Parts: •

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Yamaha Diagnostic Fault Codes & Multimeter Bench Testing

FI & OBD2 Decoder

Authentic factory ECU fault codes, sensor resistance specifications, and harness pinout troubleshooting.

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Code 12Crankshaft Position Sensor

No normal signal received from CPS during cranking.

Test: Measure 245-570 Ω across CPS harness pins.

Code 30Lean Angle Sensor

Overturned signal detected. Fuel pump & ignition latch cut off.

Test: 0.4-1.4V upright; 3.7-4.4V tilted > 65°.

Code 46System Power Supply

Abnormal charging system voltage to FI ECU.

Test: 14.0-14.8V at battery (5,000 RPM); Stator 0.15-0.25 Ω pin-to-pin.

Looking for other error codes, sensor pinouts, or OBD2/Euro 5 codes?

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Official NHTSA Safety Recalls & Technical Bulletins

0 Open Campaigns (Clean)

U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).

Verify VIN on NHTSA.gov

No Active Federal Safety Recalls Reported

The U.S. DOT National Highway Traffic Safety Administration (NHTSA) records zero open safety recall campaigns for the 2016 Yamaha Zuma 125 (YW125) platform. Always check your individual 17-digit VIN at an authorized dealership or via NHTSA.gov for individual recall completions.

OEM Workshop Archives

Official Factory Service Bulletins & Field Updates

1 Documented Bulletin

Bulletin #FSB-YAM-ZUM-01Technical Service Bulletin FSB-YAM-ZUM-01: Unified Braking System (UBS) Cable Balancing, Final Transmission Oil Drain & V-Belt Wear Service

Source: Yamaha_Zuma125_YW125_Driveline_Brake_Service.pdf

Mandated Torques:Torque: 55 N·m (40 lb-ft) (Primary Fixed Sheave Nut)Torque: 50 N·m (37 lb-ft) (Secondary Sheave Clutch Housing Nut)Torque: 13 N·m (115 in-lb) (Final Transmission Gear Oil Drain Bolt)Torque: 20 N·m (15 lb-ft) (Engine Oil Drain Bolt - 12mm Hex)

Consumable Specs:Yamalube 4 10W-40 4-Stroke OilYamalube Final Transmission Gear Oil / 85W-140 GL-4Yamaha Bel-Ray High-Temp Assembly Grease

Genuine Part Numbers:5S9-E7641-00-005S9-E7632-00-0093210-14816-00

Yamaha Adventure ScooterZuma 125 (YW125)