PROX crankshaft bearing kit for YAMAHA WR 250 F, YZ 250 F, YZ 250 FX and GAS GAS EC 250 F, EC 300 F from 2001 to 2027

Name: PROX crankshaft bearing kit for YAMAHA WR 250 F, YZ 250 F, YZ 250 FX and GAS GAS EC 250 F, EC 300 F from 2001 to 2027
Brand: PROX
SKU: 23.CBS24001
Price: 128.16 EUR
Availability: InStock

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€128.16

Tax Included

Stock del proveedor, enviado en 2 a 5 días.

The bearings that support the crankshaft in the crankcase.

PROX offers this crankshaft bearing kit for YAMAHA WR 250 F, YZ 250 F, YZ 250 FX and GAS GAS EC 250 F, EC 300 F from 2001 to 2027. The crankshaft spins on two large bearings in the cases. They take all the engine’s force; after many hours they develop play and vibration appears.

What is this bearing made of?

Races and balls (or rollers) in hardened chrome steel, 100Cr6 type: a very hard steel that withstands the fatigue of millions of engine revolutions.

Open bearing: unsealed, it is lubricated and cooled by the engine oil; clean oil is its best protection.
C3 / C4 internal clearance: slightly more clearance than normal for a hot engine’s expansion; always refit the original clearance.
Limit: it dislikes dust and old oil; running short of oil destroys it within minutes.

Why choose PROX?

ProX uses Koyo or NTN bearings, largely made in Japan in OEM factories, with the original internal clearance (C3 / C4).

When should you replace the bearings?

Unusual vibration, a deep knock that follows engine speed or play in the con-rod: the bottom end needs a rebuild.

The manufacturer publishes no hour interval for this model: have the con-rod play checked at every piston change. Cross-Mania guideline: rebuild the bottom end every 2 to 3 top-end rebuilds.

Specifications and fitting tips

Application: Crankshaft
Style: 4-stroke
Built to exact OEM specifications for maximum performance and durability
Includes the crankshaft main bearings (oil seals not included)

Cross-Mania tip: Heat the cases to remove and fit the bearings without forcing them, and replace the oil seals at the same time if your engine has them (not included).

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Reference 23.CBS24001

In stock15 Items

Specific References

Click on your bike to see all compatible parts.

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PROX crankshaft bearing and seal kit for YAMAHA WR 250 F, YZ 250 F, YZ 250 FX and GAS GAS EC 250 F, EC 300 F from 2001 to 2027

PROX crankshaft bearing kit for YAMAHA WR 250 F, YZ 250 F, YZ 250 FX and GAS GAS EC 250 F, EC 300 F from 2001 to 2027

€128.16

Tax Included


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PROX crankshaft bearing kit for YAMAHA WR 250 F, YZ 250 F, YZ 250 FX and GAS GAS EC 250 F, EC 300 F from 2001 to 2027

What is this bearing made of?

Why choose PROX?

When should you replace the bearings?

Specifications and fitting tips

Compatibility

PROX crankshaft bearing kit for YAMAHA WR 250 F, YZ 250 F, YZ 250 FX and GAS GAS EC 250 F, EC 300 F from 2001 to 2027