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Dedicated Subsystem WorkbenchPlatform Gen: 2005–2025

2023 Yamaha YZ125 Oil Capacities, Coolant & Fluid Specifications

Verified fluid capacities for 2023 Yamaha YZ125: engine oil 0.66 L (0.70 US qt) Periodic Gearbox Oil Change (0.70 L Total Overhaul), viscosity 10W-40 JASO MA Gearbox Oil + 30:1 2-Stroke Pre-Mix Oil (Yamalube 2R), coolant 1.00 L (1.06 US qt), brake fluid, and fork oil levels.

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
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 2023 Yamaha YZ125.
Configure Service Bundles→
Select Model Year:(Active: 2023)
21 Production Years (2005–2025)
Suggested Items4 Verified Workshop Consumables Available for this Job
View Suggested Items ↓
Fluids & Service Capacities
Shop Fluids →
Engine Oil (Drain & Filter Change)0.66 L (0.70 US qt) Periodic Gearbox Oil Change (0.70 L Total Overhaul)
Engine Oil (Drain Only)0.66 L (0.70 US qt) — Two-stroke gearbox has no oil filter
Recommended Oil Viscosity10W-40 JASO MA Gearbox Oil + 30:1 2-Stroke Pre-Mix Oil (Yamalube 2R)
Coolant System Capacity1.00 L (1.06 US qt)
Brake Fluid StandardDOT 4 Brake Fluid
Drivetrain, Chain & Gearing
Drive Chain Pitch520
Chain Link Count114 Links
Front Sprocket Teeth13T
Rear Sprocket Teeth49T
Final Drive Configuration520 Pitch Chain
Ignition & Electrical Specifications
Shop Plugs & Batteries →
OEM Spark Plug Part NumberNGK BR9EVX / BR9EG
Electrode Spark Plug Gap0.6 - 0.7 mm (0.024 - 0.028 in)
OEM Battery Reference CodeCapacitor-Discharge Ignition (CDI) — Batteryless Kickstart
Battery Output & RatingAC Magneto CDI System (No 12V Starter Battery)
Spark Plug Inspection IntervalN/A
Wheels, Tires & Inflation Pressures
Front Tire Dimensions80/100-21 51M
Cold Front Inflation Pressure15 PSI (Cold)
Rear Tire Dimensions100/90-19 57M
Cold Rear Inflation Pressure15 PSI (Cold)
OEM Wheel Rim Widths (F / R)3.50" / 5.50"
Verified OEM Wheel Fitment: 80/100-21 (F) + 100/90-19 (R)
Shop In-Stock Matched Pairs→

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 2023 Yamaha YZ125 platform. Always check your individual 17-digit VIN at an authorized dealership or via NHTSA.gov for individual recall completions.
1-Click Factory Service KitOEM Spec Fluid Capacities Matched

Workshop Maintenance Kit & Factory Fluids

Authentic factory-grade motor oil, oil filter, and high-temp brake fluid matched precisely to 2023 Yamaha YZ125 capacities.

Full Kit Subtotal
$74.50
SPECS-TO-CART BUNDLESDedicated Direct-Fit Maintenance Bundles Available
Explore interactive 1-click oil change packs, brake flush kits & major tune-up bundles pre-measured for this 2023 Yamaha YZ125.
Configure Service Bundles →
Silkolene Pro 4 4T Synthetic Oil 10W-40 (4 Liter)
10W-40 JASO MA2

Silkolene Pro 4 4T Synthetic Oil 10W-40 (4 Liter)

4-Liter Factory Full Jug
Matches factory 10W-40 spec (Oil spec: 0.66 L (0.70 US qt) Periodic Gearbox Oil Change (0.70 L Total Overhaul))
Item Price
$68.95
EBC High-Performance DOT 4 Synthetic Brake Fluid
DOT 4 Synthetic Formula

EBC High-Performance DOT 4 Synthetic Brake Fluid

8.8 oz (250 ml) Workshop Bottle
Meets & exceeds factory DOT 4 Brake Fluid specifications
Item Price
$5.55
Factory OEM Spark Plug Spec

NGK BR9EVX / BR9EG

Gap: 0.6 - 0.7 mm (0.024 - 0.028 in)
Inspection milestone: Not Available. Exact factory part specification.
Authentic OEM Reference
Search OEM Plugs →
Complete Workshop Maintenance Package3 Essential Service Items
Includes 10W-40 JASO MA2 engine oil (4-Liter Factory Full Jug), high-flow filter & DOT 4 fluid.
Kit Total
$74.50

Explore Other Subsystems for this 2023 Yamaha YZ125

Jump straight into dedicated factory specifications and interactive workshop diagnostic engines.

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Subsystem Guide/torques

Fastener Torques

Engine drain plug, axle spindles, caliper mounts, triple clamp pinch bolts & thread lubrication derating guide.

Open Dedicated Workbench →
Subsystem Guide/fuses-relays

Fuses & Relays

Main: N/A • Location: N/A

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Subsystem Guide/compression

Compression & Leakdown

Ratio: N/A

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Subsystem Guide/valves

Valve Clearances

Intake: N/A mm • Exhaust: N/A mm

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Subsystem Guide/fuel-delivery

Fuel Delivery & TB Sync

Idle: N/A • Rail Pressure: N/A • Vacuum: N/A

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Subsystem Guide/electrical

Charging & Battery

Battery: Capacitor-Discharge Ignition (CDI) — Batteryless Kickstart • CCA: Not Applicable (Kickstart CDI) • Regulated: AC Magneto Output to CDI

Open Dedicated Workbench →
Subsystem Guide/tires

Tires & Gearing

Front: 80/100-21 51M • Rear: 100/90-19 57M

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Subsystem Guide/suspension

Suspension & Sag

Front Travel: 300 mm • Rear Travel: 315 mm

Open Dedicated Workbench →
Subsystem Guide/maintenance

Maintenance Schedule

Oil: N/A • Valves: N/A • Plugs: N/A

Open Dedicated Workbench →
← Return to Full Comprehensive Motorcycle Specification Hub (2023 Yamaha YZ125)

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