PROX engine bearing 30 × 64 × 16 mm for YAMAHA WR 250 F, WR 250 R, YZ 250 F and GAS GAS EC 250 4T, EC 250 F

Check before ordering

• Dimensions (inner × outer × width): 30 × 64 × 16 mm

PROX offers this engine bearing for YAMAHA WR 250 F, WR 250 R, YZ 250 F and GAS GAS EC 250 4T, EC 250 F, EC 300 F from 2001 to 2027. The engine’s shafts run on ball or roller bearings in the cases. They carry heavy loads at high revs and eventually develop play.

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?

On competition bikes the main bearings are replaced at every bottom-end rebuild, at the hours recommended by the manufacturer. With the cases open, spin each bearing by hand: the slightest rough spot means it must go.

Specifications and fitting tips

• Application: Crankshaft
• ProX bearings are made in major bearing manufacturers' factories, mainly in Japan
• All bearings are made to OEM specifications for optimum quality and performance

Cross-Mania tip: Heat the cases to remove and fit the bearings without forcing them, and replace the oil seals at the same time.

Also needed with this part

• Complete engine gasket kit : CENTAURO · TECNIUM
• 4-stroke engine oil : MOTUL 10W50 · LIQUI MOLY 10W40 1 L

Compatibility

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

Fits:
GAS GAS EC 250 4T 2011
GAS GAS EC 250 4T 2010
GAS GAS EC 250 F 2015
GAS GAS EC 250 F 2014
GAS GAS EC 250 F 2013
GAS GAS EC 250 F 2012
GAS GAS EC 300 F 2015
GAS GAS EC 300 F 2014
GAS GAS EC 300 F 2013
YAMAHA WR 250 F 2026
YAMAHA WR 250 F 2025
YAMAHA WR 250 F 2024
YAMAHA WR 250 F 2023
YAMAHA WR 250 F 2022
YAMAHA WR 250 F 2021
YAMAHA WR 250 F 2020
YAMAHA WR 250 F 2019
YAMAHA WR 250 F 2018
YAMAHA WR 250 F 2017
YAMAHA WR 250 F 2016
YAMAHA WR 250 F 2015
YAMAHA WR 250 F 2014
YAMAHA WR 250 F 2013
YAMAHA WR 250 F 2012
YAMAHA WR 250 F 2011
YAMAHA WR 250 F 2010
YAMAHA WR 250 F 2009
YAMAHA WR 250 F 2008
YAMAHA WR 250 F 2007
YAMAHA WR 250 F 2006
YAMAHA WR 250 F 2005
YAMAHA WR 250 F 2004
YAMAHA WR 250 F 2003
YAMAHA WR 250 F 2002
YAMAHA WR 250 F 2001
YAMAHA WR 250 R 2020
YAMAHA WR 250 R 2019
YAMAHA WR 250 R 2018
YAMAHA WR 250 R 2017
YAMAHA WR 250 R 2016
YAMAHA WR 250 R 2015
YAMAHA WR 250 R 2014
YAMAHA WR 250 R 2013
YAMAHA WR 250 R 2012
YAMAHA WR 250 R 2011
YAMAHA WR 250 R 2010
YAMAHA WR 250 R 2009
YAMAHA WR 250 R 2008
YAMAHA YZ 250 F 2026
YAMAHA YZ 250 F 2025
YAMAHA YZ 250 F 2024
YAMAHA YZ 250 F 2023
YAMAHA YZ 250 F 2022
YAMAHA YZ 250 F 2021
YAMAHA YZ 250 F 2020
YAMAHA YZ 250 F 2019
YAMAHA YZ 250 F 2018
YAMAHA YZ 250 F 2017
YAMAHA YZ 250 F 2016
YAMAHA YZ 250 F 2015
YAMAHA YZ 250 F 2014
YAMAHA YZ 250 F 2013
YAMAHA YZ 250 F 2012
YAMAHA YZ 250 F 2011
YAMAHA YZ 250 F 2010
YAMAHA YZ 250 F 2009
YAMAHA YZ 250 F 2008
YAMAHA YZ 250 F 2007
YAMAHA YZ 250 F 2006
YAMAHA YZ 250 F 2005
YAMAHA YZ 250 F 2004
YAMAHA YZ 250 F 2003
YAMAHA YZ 250 F 2002
YAMAHA YZ 250 F 2001
YAMAHA YZ 250 FX 2027
YAMAHA YZ 250 FX 2026
YAMAHA YZ 250 FX 2025
YAMAHA YZ 250 FX 2024
YAMAHA YZ 250 FX 2023
YAMAHA YZ 250 FX 2022
YAMAHA YZ 250 FX 2021
YAMAHA YZ 250 FX 2020
YAMAHA YZ 250 FX 2019
YAMAHA YZ 250 FX 2018
YAMAHA YZ 250 FX 2017
YAMAHA YZ 250 FX 2016
YAMAHA YZ 250 FX 2015