YAMAHA YZ250FX 2018

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

4.6N

Bike Type

MX

Ideal Rider Weight

75 kg

Engine Specifications

4 Stroke Engine 250 cc

Forks Info

Fork Manufacturer

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
Yes

Fork Oil

Fork Oil Weight
SAE 2.5
Fork Oil Level
350cc mm
Oil Quanity
2 Litres

Fork Spring Information

Standard Preload
3 mm

Fork Comments

Check floating piston for cracking

Shocks Info

Shock Manufacturer

KYB
50 mm ID

Shock Dimensions

Nitrogen Pressure
142 psi
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
10
Wheel Travel
300 mm

Shock Features

Non-rebuildable
No

Shock Comments

Replace alloy shock collars with steel if binding.
KYB Genuine Front Fork Spring Each - 44mm od x 497 length

KYB Genuine Front Fork Spring Each - 44mm od x 497 length

44mm od x 497mm free length
(SKU: 11005-44-497)
HiCalibre Fork Springs 44 x 497

HiCalibre Fork Springs 44 x 497

44mm od x 497mm free length
(SKU: 19-216)
Teknik Fork Springs 43.5 x 497 (Eibach 963)

Teknik Fork Springs 43.5 x 497 (Eibach 963)

43.5mm od x 497mm free length
(SKU: 43.5-497)
Eibach EMS Fork Springs 43.9/43.9/492mm

Eibach EMS Fork Springs 43.9/43.9/492mm

Set of 2 Front Springs
(SKU: 904)
Eibach EMS Fork Springs 43.7 x 499 (43.5-497)

Eibach EMS Fork Springs 43.7 x 499 (43.5-497)

43.7mm OD x 499mm Free Length
(SKU: 963)
KYB Genuine Front Fork Slide Metal (Pair) 48mm KYB

KYB Genuine Front Fork Slide Metal (Pair) 48mm KYB

OEM KYB Japan
(SKU: 110044800202)
Inside Diameter d (mm):   48.0
Fork Inner Tube Ø d (mm):   48.0
Height H (mm):   15.0
Outside Ø D (mm):   52.0
Wall Thickness (mm):   2.0
$48.93
 14 In Stock
Outer Guide Bush 48 x 15 x 2.0 Aftermarket

Outer Guide Bush 48 x 15 x 2.0 Aftermarket

48mm id x 15mm tall x 2.0mm thick
(SKU: 24-570-01)
Inside Diameter d (mm):   48.0
Fork Inner Tube Ø d (mm):   48.0
Height H (mm):   15.0
Outside Ø D (mm):   52.0
Wall Thickness (mm):   2.0
$6.60
 712 In Stock
SKF KYB Fork Seal Kit 48mm (DUAL COMP)

SKF KYB Fork Seal Kit 48mm (DUAL COMP)

Requires 2 kits for complete fork service.
(SKU: SKF-DUAL-48K)
Colour:   Green/Orange
Seal Outer Ø D (mm):   58.42
Seal Height H (mm):   8.5
Seal Wiper Outside Ø D1 (mm):   58.70
Seal Wiper Height H1 (mm):   4.9
Fork Inner Tube Ø d (mm):   48.0
$62.95
 7 In Stock
SKF 48mm KYB Fork Seal & Wiper Set

SKF 48mm KYB Fork Seal & Wiper Set

Requires 2 kits for complete fork service.
(SKU: SKF48K)
Colour:   Green
Seal Outer Ø D (mm):   58.42
Seal Height H (mm):   8.5
Seal Wiper Outside Ø D1 (mm):   58.70
Seal Wiper Height H1 (mm):   4.9
Fork Inner Tube Ø d (mm):   48.0
$59.95
 118 In Stock
SKF 48mm KYB Fork Seal & Wiper Set - Heavy Duty

SKF 48mm KYB Fork Seal & Wiper Set - Heavy Duty

Requires 2 kits for complete fork service.
(SKU: SKF48KHD)
Colour:   Green
Seal Outer Ø D (mm):   58.42
Seal Height H (mm):   8.5
Seal Wiper Outside Ø D1 (mm):   58.70
Seal Wiper Height H1 (mm):   4.9
Fork Inner Tube Ø d (mm):   48.0
$59.95
 31 In Stock
KYB Genuine O-ring

KYB Genuine O-ring

OEM KYB Japan
(SKU: 150290000701)
$5.54
 Special Order
Order placed with KYB every week. 2-3 week delivery if in stock at KYB.
KYB Genuine O-ring

KYB Genuine O-ring

OEM KYB Japan
(SKU: 150290000701)
$5.54
 Special Order
Order placed with KYB every week. 2-3 week delivery if in stock at KYB.
Eibach EMS Shock Spring 63/65 x 257 (64_66-258 20-115)

Eibach EMS Shock Spring 63/65 x 257 (64_66-258 20-115)

63/65mm ID x 257mm Free Length
(SKU: 897)
Bump Stop Rubber 16 x 34 x 59

Bump Stop Rubber 16 x 34 x 59

16mm id x 34mm od x 59mm tall - KYB
(SKU: 22-210-00)
Height H (mm):   59.0
Outside Ø D (mm):   34.0
$22.00
 144 In Stock
KYB Genuine Piston rod rcu STD WR250F15-19 / WR450F16-18

KYB Genuine Piston rod rcu STD WR250F15-19 / WR450F16-18

OEM KYB Japan
(SKU: 120380006901)
Shock Shaft Ø D (mm):   16.0
Shaft Length / Height H (mm):   251.0
Shaft Valve Diameter Ø d (mm):   12.0
$199.13
 Coming Soon
Order placed with KYB every week. 2-3 week delivery if in stock at KYB.
KYB Genuine O-ring

KYB Genuine O-ring

OEM KYB Japan
(SKU: 150290000701)
$5.54
 Special Order
Order placed with KYB every week. 2-3 week delivery if in stock at KYB.
KYB Genuine Piston rod holder

KYB Genuine Piston rod holder

OEM KYB Japan
(SKU: 000.0657)
$30.27
 Coming Soon
Order placed with KYB every week. 2-3 week delivery if in stock at KYB.