Suspension Parts for 1984 YAMAHA YZ490 Motorbikes | Guaranteed Fitment

Discover suspension parts guaranteed to fit the 1984 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 1984 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

0.307

Stock Shock Spring Rate

4.5

Bike Type

MX

Ideal Rider Weight

75 kg

Engine Specifications

2 Stroke Engine 490 cc

FORKS INFO

Fork Manufacturer

Fork Type: KYB Conventional 43 mm OD

Fork Oil

Fork Oil Weight: SAE 7.5
Fork Oil Level: 130 mm

Fork Spring Information

Standard Preload: 10 mm

SHOCKS INFO

Shock Manufacturer

Shock Type: Soqi 46 mm ID

Shock Dimensions

Nitrogen Pressure: 175 psi
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 UPGRADE PARTS

1 Parts

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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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SHOCK SEAL CASE PARTS

1 Parts

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TOOLS & LUBRICANTS

6 Parts

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All Fitment-Matched Suspension Parts

Browse All 15 Products for YAMAHA YZ490 1984

Seal hammer 43mm

Kayaba (KYB) Genuine Motorcycle Parts

Seal hammer 43mm

Original KYB Motorcycle Suspension Tool
(SKU: 000.0652)

$144.96
1 In Stock

Front Fork Piston Metal (Pair) 43mm KYB

Kayaba (KYB) Genuine Motorcycle Parts

Front Fork Piston Metal (Pair) 43mm KYB

OEM KYB Japan Motorcycle Suspension Service Parts
(SKU: 110034300102)

Inside Diameter d (mm): 41.5

Fork Inner Tube Ø d (mm): 43.0

Height H (mm): 20.0

Outside Ø D (mm): 43.5

Wall Thickness (mm): 1.0

$52.03
31 In Stock

Front Fork Slide Metal (Pair) 43mm KYB

Kayaba (KYB) Genuine Motorcycle Parts

Front Fork Slide Metal (Pair) 43mm KYB

OEM KYB Japan Motorcycle Suspension Service Parts
(SKU: 110044300102)

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

$52.03
37 In Stock

HiCalibre Fork Springs 36 x 505 CFMoto MT450 Early CR KX RM CR with 43mm

HiCalibre

HiCalibre Fork Springs 36 x 505 CFMoto MT450 Early CR KX RM CR with 43mm

Proudly made in the USA
(SKU: 19-105)

From $345.00

Spring Rate: 0.36 kg/mm

$345.00
Special Order

SPECIAL ORDER Item from USA. 4-6 weeks delivery

SPECIAL ORDER Item from USA. 4-6 weeks delivery

Spring Rate: 0.38 kg/mm

$345.00
Coming Soon

Spring Rate: 0.40 kg/mm

$345.00
Special Order

Spring Rate: 0.42 kg/mm

$345.00
Coming Soon

Spring Rate: 0.44 kg/mm

$345.00
8 In Stock

Spring Rate: 0.46 kg/mm

$345.00
6 In Stock

Spring Rate: 0.48 kg/mm

$345.00
3 In Stock

Spring Rate: 0.50 kg/mm

$345.00
6 In Stock

Spring Rate: 0.54 kg/mm

$345.00
9 In Stock

Spring Rate: 0.58 kg/mm

$345.00
9 In Stock

Spring Rate: 0.60 kg/mm

$345.00
7 In Stock

Spring Rate: 0.62 kg/mm

$345.00
Special Order

Spring Rate: 0.64 kg/mm

$345.00
Special Order

Spring Rate: 0.66 kg/mm

$345.00
Special Order

Fork Oil Seal - 43 x 55 x 10.5/12

Kayaba (KYB) Genuine Motorcycle Parts

Fork Oil Seal - 43 x 55 x 10.5/12

43mm id x 55mm od x 10.5/12mm tall - KYB Conventional
(SKU: 24-866-00)

$33.00
42 In Stock

36mm Platinum Valve for Damper Rod Forks

Teknik Motorsport

36mm Platinum Valve for Damper Rod Forks

36mm Cartridge Emulator Valve
(SKU: 25-050-11)

$295.00
84 In Stock

All Balls Rear Shock Seal Kit - YZ100/125/250/IT175 80-81

All Balls

All Balls Rear Shock Seal Kit - YZ100/125/250/IT175 80-81

14 ID 46 OD
(SKU: 37-1116)

Shock Bore Ø D (mm): 46.0

Shock Shaft Ø D (mm): 14.0

Height H (mm): 29.0

$95.00
1 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
22 In Stock

Fork Seal Driver - 43mm

Techtool

Fork Seal Driver - 43mm

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

$76.95
13 In Stock

Shock Seal Head Brass Bullet 5Pc Kit

Techtool

Shock Seal Head Brass Bullet 5Pc Kit

12.5x10 | 14x12 | 16x12 | 18x12 | 18x16 mm
(SKU: 93-031-00)

$76.95
2 In Stock

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