Dedicated Subsystem WorkbenchPlatform Gen: 2005–2025

sms%3A6572176457 Yamaha YZ125 Charging System, Stator AC Output & Battery Health

Stator 3-phase AC voltage at 5,000 RPM, coil resistance, regulated DC voltage, battery code Capacitor-Discharge Ignition (CDI) — Batteryless Kickstart, CCA rating, and multimeter charging diagnostic steps for sms%3A6572176457 Yamaha YZ125.

Technical PassportOEM VERIFIED

Engine

125cc

Cooling

Not Available

Final Drive

520 Chain

Engine Oil

0.66 L (0.70 US qt) Periodic Gearbox Oil Change (0.70 L Total Overhaul)

Spark Plug

NGK BR9EVX / BR9EG

Front Tire

80/100-21 51M

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Gen 2005–2025

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2005 through 2025.

SPECS-TO-CART BUNDLESFactory Direct-Fit Maintenance Bundles Available

1-Click verified Motul engine oil service kits, race filters, spark plugs, and brake fluid pre-measured for this sms%3A6572176457 Yamaha YZ125.

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Select Model Year:(Active: sms%3A6572176457)
21 Production Years (2005–2025)

2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

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.

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OEM Battery Code

Capacitor-Discharge Ignition (CDI) — Batteryless Kickstart (Batteryless Magneto CDI)

Cold Cranking Rating

Not Applicable (Kickstart CDI) CCA

Capacity (10HR Rate)

Not Applicable Ah (12V)

Regulated Output Spec

AC Magneto Output to CDI

Key-OFF Parasitic Limit

0 mA (Batteryless)

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

Lithium LiFePO4 UpgradeUp to 70% Lighter

Not Applicable (Kickstart 2-Stroke)

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: Not Applicable. 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.

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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 sms%3A6572176457 Yamaha YZ125 platform. Always check your individual 17-digit VIN at an authorized dealership or via NHTSA.gov for individual recall completions.