Suspension Parts for 2004 YAMAHA YZ125 Motorbikes | Guaranteed Fitment

Discover suspension parts guaranteed to fit the 2004 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 2004 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

0.4

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

Fork Type: KYB USD 48 mm OD

Fork Dimensions

Compression Nut Torque: 48 in-lb (0.56 kgf-m)
Fork Travel: 300 mm

Fork Features

Twin Chamber Fork: No

Fork Oil

Fork Oil Weight: SAE 2.5
Fork Oil Level: 125 mm

Fork Spring Information

Standard Preload: 8 mm

SHOCKS INFO

Shock Manufacturer

Shock Type: KYB 46 mm ID

Shock Dimensions

Nitrogen Pressure: 142 psi
Shock Length (Eye to Eye): 494 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 SEALS & BUSHES

15 Parts

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FORK COMPRESSION ADJUSTER ASSY

16 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

23 Parts

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TOOLS & LUBRICANTS

37 Parts

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All Fitment-Matched Suspension Parts

Browse All 157 Products for YAMAHA YZ125 2004

Zeta Racing Rear Shock Suspension lowering Kit. 46 and 50mm KYB Showa Sachs

DRC Zeta Hardware

Zeta Racing Rear Shock Suspension lowering Kit. 46 and 50mm KYB Showa Sachs

(SKU: ZE56-322)

From $49.95

Colour: Blue
Shock Bore Ø D (mm): 46.0

$49.95
2 In Stock

Colour: Red
Shock Bore Ø D (mm): 50.0

$60.50
2 In Stock

Cylinder head ff bearing press in/out

Kayaba (KYB) Genuine Motorcycle Parts

Cylinder head ff bearing press in/out

Original KYB Motorcycle Suspension Tool
(SKU: 000.0520)

$32.19
Coming Soon

Piston ring mounting set RCU 46mm

Kayaba (KYB) Genuine Motorcycle Parts

Piston ring mounting set RCU 46mm

Original KYB Motorcycle Suspension Tool
(SKU: 000.0623)

$191.18
Coming Soon

Fork Tubes NOK Oil Seals Pair - 48id x 58od x 8.5mm

Kayaba (KYB) Genuine Motorcycle Parts

Fork Tubes NOK Oil Seals Pair - 48id x 58od x 8.5mm

OEM KYB Japan Motorcycle Suspension Service Parts
(SKU: 110014800202)

$49.50
Coming Soon

Plastic ring under top cap 48mm

Kayaba (KYB) Genuine Motorcycle Parts

Plastic ring under top cap 48mm

Original KYB Japan Motorcycle Suspension Parts
(SKU: 110110000101)

$6.97
Special Order

Fork Inner Cartridge Rod Top Piston Lock Nut - KX 1999-2002 & 2004 & RM 2001

Kayaba (KYB) Genuine Motorcycle Parts

Fork Inner Cartridge Rod Top Piston Lock Nut - KX 1999-2002 & 2004 & RM 2001

Original KYB Japan Motorcycle Suspension Parts
(SKU: 110160000601)

$29.59
Special Order

Front Fork Coil Spring Guide - YZ 04

Kayaba (KYB) Genuine Motorcycle Parts

Front Fork Coil Spring Guide - YZ 04

Original KYB Japan Motorcycle Suspension Parts
(SKU: 110184800201)

$26.88
Special Order

O-ring base valve ff 96-04

Kayaba (KYB) Genuine Motorcycle Parts

O-ring base valve ff 96-04

Original KYB Japan Motorcycle Suspension Parts
(SKU: 110800000101)

$4.86
Special Order

Rear Shock O-Ring Air Valve Comp

Kayaba (KYB) Genuine Motorcycle Parts

Rear Shock O-Ring Air Valve Comp

OEM KYB Japan Motorcycle Suspension Service Parts
(SKU: 120120000101)

$4.86
Special Order

Nut for spring rcu 46mm bottom Steel

Kayaba (KYB) Genuine Motorcycle Parts

Nut for spring rcu 46mm bottom Steel

Original KYB Japan Motorcycle Suspension Parts
(SKU: 120174600101)

$64.19
Coming Soon

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