Suspension Parts for 1978 YAMAHA YZ250 Motorbikes | Guaranteed Fitment

Discover suspension parts guaranteed to fit the 1978 YAMAHA YZ250. 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 1978 YAMAHA YZ250.

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

Bike Type

MX

Ideal Rider Weight

75 kg

Engine Specifications

2 Stroke Engine 250 cc

FORKS INFO

Fork Manufacturer

: KYB Conventional 38 mm OD

Fork Oil

Fork Oil Weight: SAE 7.5
Fork Oil Level: 130 mm
Oil Quanity: 1 Litre

Fork Spring Information

Standard Preload: 10 mm

SHOCKS INFO

Shock Manufacturer

Soqi: 46 mm ID

Shock Dimensions

Nitrogen Pressure: 175 psi
Shock Shaft Outer Diameter: 22 mm
Standard Sag: 103 mm
Shaft Nut Torque: 25 ft-lbs (34 NM)
Shock Oil: 5 Weight

Fitment-Matched Suspension Parts by Category

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

1 Parts

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FORK SEALS & BUSHES

2 Parts

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SHOCK SPRINGS
Ideal Spring Rate for kg: kg/mm ( N/mm)

1 Parts

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SHOCK SEAL CASE PARTS

1 Parts

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SHOCK SHAFT PARTS

1 Parts

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TOOLS & LUBRICANTS

5 Parts

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All Fitment-Matched Suspension Parts

Browse All 12 Products for YAMAHA YZ250 1978

HiCalibre Fork Springs 30 x 597 Common Fitment Honda CRF230

HiCalibre

HiCalibre Fork Springs 30 x 597 Common Fitment Honda CRF230

Proudly made in the USA
(SKU: 19-060)

From $245.00

Spring Rate: 0.38 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: 0.40 kg/mm

$245.00
Special Order

Spring Rate: 0.42 kg/mm

$245.00
Special Order

Spring Rate: 0.44 kg/mm

$245.00
Special Order

Spring Rate: 0.46 kg/mm

$245.00
Special Order

Spring Rate: 0.48 kg/mm

$245.00
Special Order

HiCalibre Shock Spring 55 x 310 Yamaha OEM 90501-99481-00 Fitment

HiCalibre

HiCalibre Shock Spring 55 x 310 Yamaha OEM 90501-99481-00 Fitment

Proudly made in the USA
(SKU: 20-026)

From $345.00

Colour: Black or White
Spring Rate: 3.0-3.5 kg/mm Progressive

$345.00
5 In Stock

Outer Guide Bush 38 x 12 x 2.0

Teknik Motorsport

Outer Guide Bush 38 x 12 x 2.0

38mm id x 12mm tall x 2.0mm thick
(SKU: 24-572-00)

Inside Diameter d (mm): 38.0

Fork Inner Tube Ø d (mm): 38.0

Height H (mm): 12.0

Outside Ø D (mm): 42.0

Wall Thickness (mm): 2.0

$40.15
2 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
2 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
4 In Stock

Fork Seal Driver - 39mm

Techtool

Fork Seal Driver - 39mm

See Part # 93-009-00 for complete set
(SKU: 93-009-08)

$76.95
2 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)

$177.09
4 In Stock

Ohlins YA367 STX 46 MX for Yamaha YZ 250/465 1978-1982

Ohlins

Ohlins YA367 STX 46 MX for Yamaha YZ 250/465 1978-1982

Ohlins Suspension - Engineered for Performance
(SKU: YA367)

Position (Front or Rear): Rear Mono

Shock Length Eye to Eye (mm): 542.0

Type Code: S46HR1

Stroke Metal to Metal (mm): 161.0

Product Family: STX 46 MX

Fitted Spring: 05174-09

Spring Colour: Yellow

Rec. Ohlins Oil: 01304-

$1,799.95
2 In Stock

YZ 125/250/465 1978-1982 Shock Shaft

Teknik Motorsport

YZ 125/250/465 1978-1982 Shock Shaft

Yamaha 1978-1982 YZ 125/250/465
(SKU: 22-004-16)

$198.00
Nil Stock

Inner Slide Bush 38 x 20 x 1.0

Teknik Motorsport

Inner Slide Bush 38 x 20 x 1.0

38mm od x 20mm tall x 1.0mm thick
(SKU: 24-667-00)

Inside Diameter d (mm): 36.0

Fork Inner Tube Ø d (mm): 38.0

Height H (mm): 20.0

Outside Ø D (mm): 38.0

Wall Thickness (mm): 1.0

$40.15
Nil Stock

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