YAMAHA YZ490 1986

Calculate Spring Rates

Rider Weight

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


Stock Shock Spring Rate


Bike Type


Ideal Rider Weight

75 kg

Engine Specifications

2 Stroke Engine 490 cc

Forks Info

Fork Manufacturer

KYB Conventional 43 mm OD

Fork Oil

Fork Oil Weight
SAE 7.5
Fork Oil Level
130 mm
Oil Quanity
2 Litres

Fork Spring Information

Standard Preload
10 mm

Shocks Info

Shock Manufacturer

46 mm ID

Shock Dimensions

Nitrogen Pressure
142 psi
Shock Length (Eye to Eye)
420 mm
Shock Travel
119.1 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)