PROX engine bearing 63/22 – 22 × 56 × 16 mm for YAMAHA YZ 125, YZ 125 X from 1986 to 2027

Check before ordering

• Bearing: 63/22
• Dimensions (inner × outer × width): 22 × 56 × 16 mm

PROX offers this engine bearing for YAMAHA YZ 125, YZ 125 X from 1986 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 your YAMAHA YZ 125?

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 : MOOSE 808641MSE · MOOSE 811641MSE
• 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063

Compatibility

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

Fits:
YAMAHA YZ 125 2027
YAMAHA YZ 125 2026
YAMAHA YZ 125 2025
YAMAHA YZ 125 2024
YAMAHA YZ 125 2023
YAMAHA YZ 125 2022
YAMAHA YZ 125 2021
YAMAHA YZ 125 2020
YAMAHA YZ 125 2019
YAMAHA YZ 125 2018
YAMAHA YZ 125 2017
YAMAHA YZ 125 2016
YAMAHA YZ 125 2015
YAMAHA YZ 125 2014
YAMAHA YZ 125 2013
YAMAHA YZ 125 2012
YAMAHA YZ 125 2011
YAMAHA YZ 125 2010
YAMAHA YZ 125 2009
YAMAHA YZ 125 2008
YAMAHA YZ 125 2007
YAMAHA YZ 125 2006
YAMAHA YZ 125 2005
YAMAHA YZ 125 2004
YAMAHA YZ 125 2003
YAMAHA YZ 125 2002
YAMAHA YZ 125 2001
YAMAHA YZ 125 2000
YAMAHA YZ 125 1999
YAMAHA YZ 125 1998
YAMAHA YZ 125 1997
YAMAHA YZ 125 1996
YAMAHA YZ 125 1995
YAMAHA YZ 125 1994
YAMAHA YZ 125 1993
YAMAHA YZ 125 1992
YAMAHA YZ 125 1991
YAMAHA YZ 125 1990
YAMAHA YZ 125 1989
YAMAHA YZ 125 1988
YAMAHA YZ 125 1987
YAMAHA YZ 125 1986
YAMAHA YZ 125 X 2027
YAMAHA YZ 125 X 2026
YAMAHA YZ 125 X 2025
YAMAHA YZ 125 X 2024
YAMAHA YZ 125 X 2023
YAMAHA YZ 125 X 2022
YAMAHA YZ 125 X 2021
YAMAHA YZ 125 X 2020