Dedicated Subsystem WorkbenchPlatform Gen: 2009–2026

sms%3A6572176457 Yamaha Zuma 125 (YW125) Tire Sizes, Cold Pressures & Gearing Ratios

OEM tire sizes, front cold PSI (), rear cold PSI (), sprocket teeth count, final drive ratio, and chain pitch for sms%3A6572176457 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: sms%3A6572176457)
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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Tire Engineering & Multi-Scenario Pressure Matrix

ETRTO Validated

Inflation targets calibrated across operating modes, verified rim width ranges, and certified alternate sizes.

Shop Direct-Fit Tires

Multi-Scenario Inflation Pressures

Solo Street / CommutingCold Baseline

Front: Not Available

Rear: Not Available

Two-Up Passenger & LuggageMax Load

Front: Not Available

Rear: Not Available

Off-Highway / Terrain Pressure

Maintain OEM cold baseline for street transfers; adjust -2 to -4 PSI for loose terrain.

Rim Geometry & ETRTO Envelopes

Front Wheel

OEM Rim Width:Not Available

Permissible Envelope:Not Available

Rear Wheel

OEM Rim Width:Not Available

Permissible Envelope:Not Available

Operating outside ETRTO envelope width alters crown radius, accelerates shoulder wear, and impacts lean stability.

Factory Dimensions & Verified Alternates

Factory Standard Sizes

Front:120/70-12 51L Dual-Sport Tread

Rear:130/70-12 56L Dual-Sport Tread

Shop In-Stock Matched 2-Tire Sets→

Verified Alternate Fitments

Factory standard sizing recommended.

Alternate profiles verified for swingarm, chain guard, and fender clearances.

Final Drive Gearing & Speed/RPM Calculator

Belt Drive

Factory reduction ratios, interactive sprocket gearing simulator, 6th gear cruising RPM matrix, and swingarm chain adjustment tolerances.

Launch Full Gearing Simulator Shop Drive Belts

Drive Architecture

Poly-Chain Carbon Belt

OEM Pulleys

29T Transmission / 68T Wheel

OEM Final Ratio

2.345 : 1

Belt Teeth & Width

T • 

Cold Tension Deflection

Quick Gearing Presets

Front Transmission PulleyStock: 29T

29 Teeth

Factory teeth count

Rear Wheel Belt PulleyStock: 68T

68 Teeth

Factory teeth count

Drive Ratio & Torque Impact

Calculated Final RatioStock: 2.345

2.345 : 1

Drivetrain Torque Delta

OEM Factory Baseline Dynamics

Balanced all-around factory engineering calibrated for EPA emissions and street usability.

Countershaft Speedo Variance:0.0%

Speedometer reads true to factory calibration standards.

Cruising Engine RPM in 6th Gear

60 MPH

Stock: 3,829 RPM

3,829 RPM

70 MPH

Stock: 4,467 RPM

4,467 RPM

80 MPH

Stock: 5,105 RPM

5,105 RPM

Calculated using factory 6th gear ratio (0.923), primary reduction (1.681), and 130/70-12 56L Dual-Sport Tread rolling circumference.

Belt Tension & Deflection Spec

Cold Deflection Tolerance

Check tension using a 10-lb belt tension gauge at the lower belt run midpoint window on the side stand.

Belt Architecture

T • 

Recommended Belt:

Shop Belt Tension Gauges Find Direct-Fit Gearing Sets

Factory Chassis Geometry

Chassis Alignment, Drive Tension & Rear Axle Calibration

Precision workshop alignment tools, dynamic drive tension tolerances, and axle spindle calibration for the sms%3A6572176457 Yamaha Zuma 125 (YW125).

Belt Drive Architecture

Secondary Belt Deflection & 10-lb Tension Calibration

FACTORY BELT DEFLECTION SPEC:

Measure cold deflection with a spring-loaded belt tension tool applying exactly 10 lbs (4.5 kg) of upward force at the lower belt run inspection window on jiffy stand.

CARBON BELT TOOTH & FLANGE INSPECTION:

T • 

Inspect polyurethane cog teeth for stone gouges or embedded gravel. Verify rear pulley chrome flanges show even belt tracking without edge fraying.

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 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)