Suspension Parts for 1988 YAMAHA YZ490 Motorbikes | Guaranteed Fitment

Discover suspension parts guaranteed to fit the 1988 YAMAHA YZ490. 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 1988 YAMAHA YZ490.

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

0.376

Stock Shock Spring Rate

5.8

Bike Type

MX

Ideal Rider Weight

75 kg

Engine Specifications

2 Stroke Engine 490 cc

FORKS INFO

Fork Manufacturer

: KYB Conventional 43 mm OD

Fork Dimensions

Compression Nut Torque: 25 in-lb (0.29 kgf-m)

Fork Features

Twin Chamber Fork: No

Fork Oil

Fork Oil Weight: SAE 5
Fork Oil Level: 130 mm
Oil Quanity: 2 Litres

Fork Spring Information

Standard Preload: 10 mm

SHOCKS INFO

Shock Manufacturer

Soqi: 46 mm ID

Shock Dimensions

Nitrogen Pressure: 142 psi
Shock Length (Eye to Eye): 420 mm
Shock Travel: 119 mm
Shock Shaft Outer Diameter: 14 mm
Standard Sag: 103 mm
Shaft Nut Torque: 25 ft-lbs (34 NM)
Shock Oil: 5 Weight

Shock Comments

: SEND to Teknik 16mm shaft conversion (call)

Fitment-Matched Suspension Parts by Category

FORK SPRINGS
Ideal Fork Rate for kg: kg/mm ( N/mm)

2 Parts

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FORK SEALS & BUSHES

5 Parts

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TOOLS & LUBRICANTS

10 Parts

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All Fitment-Matched Suspension Parts

Browse All 18 Products for YAMAHA YZ490 1988

Fork Seal Driver - 43mm

Techtool

Fork Seal Driver - 43mm

See Part # 93-009-00 for complete set
(SKU: 93-009-20)

$76.95
19 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
18 In Stock

Shock Bushing Driver Set

Techtool

Shock Bushing Driver Set

(SKU: 93-118-00)

$33.00
8 In Stock

Eibach EMS Moto Front Fork Spring Kit. 36.7 x 510 1996-2004 Honda XR400 Suzuki DR250 350 650

Eibach Suspension Technology

Eibach EMS Moto Front Fork Spring Kit. 36.7 x 510 1996-2004 Honda XR400 Suzuki DR250 350 650

Made in the USA (QS9000) or Germany (ISO16949)
(SKU: 996)

spring rate: 0.45 kg/mm

$249.94
1 In Stock

spring rate: 0.47 kg/mm

$249.94
1 In Stock

spring rate: 0.50 kg/mm

$249.94
2 In Stock

spring rate: 0.48 kg/mm

$249.94
3 In Stock

DRC FORK SEAL DRIVER SET | UNIVERSAL | 40-50mm

DRC Zeta Hardware

DRC FORK SEAL DRIVER SET | UNIVERSAL | 40-50mm

DRC Fork Seal Driver Tool Set
(SKU: D59-26-005)

$139.99
5 In Stock

InnTeck Inner Slide Fork Bush KAYABA 43mm **can use KYB 110034300102**

Innteck

InnTeck Inner Slide Fork Bush KAYABA 43mm can use KYB 110034300102

KAYABA 43mm 42x44x20
(SKU: SKTE43K)

Inside Diameter d (mm): 42.0

Fork Inner Tube Ø d (mm): 43.0

Height H (mm): 20.0

Outside Ø D (mm): 44.0

Wall Thickness (mm): 1.0

$22.00
5 In Stock

InnTeck Outer Guide Fork Bush KAYABA 43mm **can use KYB 110044300102**

Innteck

InnTeck Outer Guide Fork Bush KAYABA 43mm can use KYB 110044300102

KAYABA 43mm 43x47x12
(SKU: SKTI43K)

Inside Diameter d (mm): 43.0

Fork Inner Tube Ø d (mm): 43.0

Height H (mm): 12.0

Outside Ø D (mm): 47.0

Wall Thickness (mm): 2.0

$22.00
3 In Stock

Shock Re-Gassing Gauge **NLA** - New product Coming early 2026

Teknik Tools

Shock Re-Gassing Gauge NLA - New product Coming early 2026

Teknik Zero-Loss Nitrogen Charging Tool – Legacy Model
(SKU: 93-022-00)

$199.00
Nil Stock

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