Suspension Parts for 2003 YAMAHA YZ125 Motorbikes | Guaranteed Fitment

Christmas opening hours. Last shipping day Wednesday 24th December. All orders placed over the break will ship Monday 5th January.

Discover suspension parts guaranteed to fit the 2003 YAMAHA YZ125. Every product in this category has been validated against year-specific fork and shock specifications to ensure true compatibility.
You’ll find fork components, shock parts, shims, upgrade kits, complete suspension systems, chassis components, and the tools and fluids required for accurate servicing - all aligned with the suspension setup of the 2003 YAMAHA YZ125.

Use this page as a reliable reference when maintaining, rebuilding, or upgrading your bike’s suspension.

Bike-Specific Suspension Specifications & Setup Information

CALCULATE SPRING RATES

This is a recommendation only please consult your manual

Ideal Fork Rate:

kg/mm ( N/mm)

Ideal Shock Rate:

kg/mm ( N/mm)

BIKE DETAILS

Stock Fork Spring Rate

0.41

Stock Shock Spring Rate

4.6

Bike Type

MX

Ideal Rider Weight

75 kg

Engine Specifications

2 Stroke Engine 125 cc

FORKS INFO

Fork Manufacturer

: KYB USD 46 mm OD

Fork Dimensions

Compression Nut Torque: 48 in-lb (0.56 kgf-m)
Fork Travel: 280 mm

Fork Features

Twin Chamber Fork: No

Fork Oil

Fork Oil Weight: SAE 5
Fork Oil Level: 125 mm
Oil Quanity: 2 Litres

Fork Spring Information

Standard Preload: 8 mm

SHOCKS INFO

Shock Manufacturer

KYB: 46 mm ID

Shock Dimensions

Nitrogen Pressure: 142 psi
Shock Length (Eye to Eye): 485 mm
Shock Travel: 136 mm
Shock Shaft Outer Diameter: 16 mm
Standard Sag: 103 mm
Shaft Nut Torque: 25 ft-lbs (34 NM)
Shock Oil: 2.5 Weight
Standard Preload: 8

Shock Features

Non-rebuildable: No

Fitment-Matched Suspension Parts by Category

FORK COMPRESSION ADJUSTER ASSY

18 Parts

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FORK O-RINGS

12 Parts

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SHOCK SEAL CASE PARTS

14 Parts

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SHOCK SHAFT PARTS

17 Parts

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SHOCK BODY PARTS

17 Parts

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SUSPENSION LOCKNUTS & BUSHES

22 Parts

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TOOLS & LUBRICANTS

31 Parts

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All Fitment-Matched Suspension Parts

Browse All 139 Products for YAMAHA YZ125 2003

Fork Oil Level Tool

Techtool

Fork Oil Level Tool

Motorcycle Suspension Tools
(SKU: 93-002-00)

$39.93
16 In Stock

Shock Compression Socket - KYB early - Hi/Lo

Techtool

Shock Compression Socket - KYB early - Hi/Lo

Removes compression adjuster assembly from KYB Shocks
(SKU: 93-006-00)

$33.00
19 In Stock

Fork Bleeder Tool Set

Techtool

Fork Bleeder Tool Set

Motorcycle Suspension Tools
(SKU: 93-007-00)

$110.00
28 In Stock

Techtool Motorcycle Fork Seal Driver Kit 9pc Kit

Techtool

Techtool Motorcycle Fork Seal Driver Kit 9pc Kit

35/36-39-41-43-45-46/47-48-49/50-54mm
(SKU: 93-009-00)

$470.58
3 In Stock

Fork Seal Driver - 46/47mm

Techtool

Fork Seal Driver - 46/47mm

See Part # 93-009-00 for complete set
(SKU: 93-009-40)

$76.95
18 In Stock

24mm Shock Compression Adjuster Socket Tool

Techtool

24mm Shock Compression Adjuster Socket Tool

For KYB & Showa Shocks
(SKU: 93-019-00)

$30.00
23 In Stock

24mm Shock Compression Adjuster Socket Tool - with 24mm Hex

Techtool

24mm Shock Compression Adjuster Socket Tool - with 24mm Hex

For KYB & Showa Shocks
(SKU: 93-019-02)

$27.50
12 In Stock

16 x 12mm Shock Seal Head Bullet

Teknik Tools

16 x 12mm Shock Seal Head Bullet

Motorcycle Suspension Tools
(SKU: 93-025-00)

$19.95
25 In Stock

Shock Seal Head Bullet 5Pc Kit

Techtool

Shock Seal Head Bullet 5Pc Kit

Shock Seal Head Bullet 5pc Kit
(SKU: 93-031-00)

$76.95
17 In Stock

Techtool Fork Tube Tool & Cartridge Rod Holding Plate

Techtool

Techtool Fork Tube Tool & Cartridge Rod Holding Plate

For KYB, Showa & WP Twin or Open Chamber Forks
(SKU: 93-032-00)

$220.00
18 In Stock

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