Suspension Parts for 2003 YAMAHA YZ450F Motorbikes | Guaranteed Fitment

Discover suspension parts guaranteed to fit the 2003 YAMAHA YZ450F. 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 YZ450F.

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

0.47

Stock Shock Spring Rate

5.3

Bike Type

MX

Ideal Rider Weight

75 kg

Engine Specifications

4 Stroke Engine 450 cc

FORKS INFO

Fork Manufacturer

: KYB USD 46 mm OD

Fork Dimensions

Compression Nut Torque: 48 in-lb (0.56 kgf-m)
Fork Travel: 295 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: 7 mm

SHOCKS INFO

Shock Manufacturer

KYB: 46 mm ID

Shock Dimensions

Nitrogen Pressure: 142 psi
Shock Length (Eye to Eye): 491 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: 11

Shock Features

Non-rebuildable: No

Fitment-Matched Suspension Parts by Category

FORK COMPRESSION ADJUSTER ASSY

18 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 138 Products for YAMAHA YZ450F 2003

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
6 In Stock

KYB Suspension Tools Cylinder head Front Fork bearing press in/out

Kayaba (KYB) Genuine Motorcycle Parts

KYB Suspension Tools Cylinder head Front Fork bearing press in/out

Original KYB Motorcycle Suspension Tool
(SKU: 000.0520)

$28.60
Special Order

KYB Suspension Tools Piston ring mounting set RCU 46mm

Kayaba (KYB) Genuine Motorcycle Parts

KYB Suspension Tools Piston ring mounting set RCU 46mm

Original KYB Motorcycle Suspension Tool
(SKU: 000.0623)

$169.90
Special Order

Fork Base Valve Tower O-Ring Seal - 1996-2004

Kayaba (KYB) Genuine Motorcycle Parts

Fork Base Valve Tower O-Ring Seal - 1996-2004

Original KYB Japan Motorcycle Suspension Parts
(SKU: 110800000101)

$4.88
Special Order

Kayaba (KYB) Genuine Parts Bearing body rcu dust seal YZ/GasGas 18-

Kayaba (KYB) Genuine Motorcycle Parts

Kayaba (KYB) Genuine Parts Bearing body rcu dust seal YZ/GasGas 18-

Original KYB Japan Motorcycle Suspension Parts
(SKU: 120030000101)

$7.26
Special Order

Kayaba (KYB) Genuine Parts Rear Shock Bearing Body KYB

Kayaba (KYB) Genuine Motorcycle Parts

Kayaba (KYB) Genuine Parts Rear Shock Bearing Body KYB

OEM KYB Japan Motorcycle Suspension Service Parts
(SKU: 120050000101)

$29.85
Special Order

Kayaba (KYB) Genuine Parts Rear Shock O-Ring Air Valve Comp

Kayaba (KYB) Genuine Motorcycle Parts

Kayaba (KYB) Genuine Parts Rear Shock O-Ring Air Valve Comp

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

$4.88
Special Order

Kayaba (KYB) Genuine Parts Valve stopper rcu YZ125

Kayaba (KYB) Genuine Motorcycle Parts

Kayaba (KYB) Genuine Parts Valve stopper rcu YZ125

Original KYB Japan Motorcycle Suspension Parts
(SKU: 120190000301)

$16.61
Special Order

Kayaba (KYB) Genuine Parts Piston rod rcu STD WR450F 2012-2015 KX 1998-1999 YZ 2000-2005 RM 2001-2003

Kayaba (KYB) Genuine Motorcycle Parts

Kayaba (KYB) Genuine Parts Piston rod rcu STD WR450F 2012-2015 KX 1998-1999 YZ 2000-2005 RM 2001-2003

Original KYB Japan Motorcycle Suspension Parts
(SKU: 120380001101)

Shock Shaft Ø D (mm): 16.0

Shaft Length / Height H (mm): 254.5

Shaft Valve Diameter Ø d (mm): 12.0

Shaft Chrome Length H1 (mm): 181.0

$210.67
Special Order

Kayaba (KYB) Genuine Parts Rear Shock Drain Bolt O-Ring

Kayaba (KYB) Genuine Motorcycle Parts

Kayaba (KYB) Genuine Parts Rear Shock Drain Bolt O-Ring

OEM KYB Japan Motorcycle Suspension Service Parts
(SKU: 120520000101)

$3.51
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