PROX engine bearing 6304 C3 – 20 × 52 × 15 mm for KAWASAKI KX 80, YAMAHA YZ 80

Check before ordering

• Bearing: 6304 C3
• Dimensions (inner × outer × width): 20 × 52 × 15 mm

PROX offers this engine bearing for KAWASAKI KX 80, YAMAHA YZ 80, SUZUKI RM 85 and HONDA CRF 50 F from 1977 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 : TECNIUM 808412 · TECNIUM 808614
• 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:
HONDA CRF 50 F 2012
HONDA CRF 50 F 2011
HONDA CRF 50 F 2010
HONDA CRF 50 F 2009
HONDA CRF 50 F 2008
HONDA CRF 50 F 2007
HONDA CRF 50 F 2006
HONDA CRF 50 F 2005
HONDA CRF 50 F 2004
HONDA CRF 70 F 2012
HONDA CRF 70 F 2011
HONDA CRF 70 F 2010
HONDA CRF 70 F 2009
HONDA CRF 70 F 2008
HONDA CRF 70 F 2007
HONDA CRF 70 F 2006
HONDA CRF 70 F 2005
HONDA CRF 70 F 2004
HONDA XR 50 R 2003
HONDA XR 50 R 2002
HONDA XR 50 R 2001
HONDA XR 50 R 2000
HONDA XR 70 R 2003
HONDA XR 70 R 2002
HONDA XR 70 R 2001
HONDA XR 70 R 2000
HONDA XR 70 R 1999
HONDA XR 70 R 1998
HONDA XR 70 R 1997
KAWASAKI KX 100 2019
KAWASAKI KX 100 2018
KAWASAKI KX 100 2017
KAWASAKI KX 100 2016
KAWASAKI KX 100 2015
KAWASAKI KX 100 2014
KAWASAKI KX 100 2013
KAWASAKI KX 100 2012
KAWASAKI KX 100 2011
KAWASAKI KX 100 2010
KAWASAKI KX 100 2009
KAWASAKI KX 100 2008
KAWASAKI KX 100 2007
KAWASAKI KX 100 2006
KAWASAKI KX 100 2005
KAWASAKI KX 100 2004
KAWASAKI KX 100 2003
KAWASAKI KX 100 2002
KAWASAKI KX 100 2001
KAWASAKI KX 100 2000
KAWASAKI KX 100 1999
KAWASAKI KX 100 1998
KAWASAKI KX 112 2025
KAWASAKI KX 112 2024
KAWASAKI KX 112 2023
KAWASAKI KX 112 2022
KAWASAKI KX 60 A 1985
KAWASAKI KX 60 B 2003
KAWASAKI KX 60 B 2002
KAWASAKI KX 60 B 2001
KAWASAKI KX 60 B 2000
KAWASAKI KX 60 B 1999
KAWASAKI KX 60 B 1998
KAWASAKI KX 60 B 1997
KAWASAKI KX 60 B 1996
KAWASAKI KX 60 B 1995
KAWASAKI KX 60 B 1994
KAWASAKI KX 60 B 1993
KAWASAKI KX 60 B 1992
KAWASAKI KX 60 B 1991
KAWASAKI KX 60 B 1990
KAWASAKI KX 60 B 1989
KAWASAKI KX 60 B 1988
KAWASAKI KX 60 B 1987
KAWASAKI KX 60 B 1986
KAWASAKI KX 60 B 1985
KAWASAKI KX 65 2027
KAWASAKI KX 65 2026
KAWASAKI KX 65 2025
KAWASAKI KX 65 2024
KAWASAKI KX 65 A 2019
KAWASAKI KX 65 A 2018
KAWASAKI KX 65 A 2017
KAWASAKI KX 65 A 2016
KAWASAKI KX 65 A 2015
KAWASAKI KX 65 A 2014
KAWASAKI KX 65 A 2013
KAWASAKI KX 65 A 2012
KAWASAKI KX 65 A 2011
KAWASAKI KX 65 A 2010
KAWASAKI KX 65 A 2009
KAWASAKI KX 65 A 2008
KAWASAKI KX 65 A 2007
KAWASAKI KX 65 A 2006
KAWASAKI KX 65 A 2005
KAWASAKI KX 65 A 2004
KAWASAKI KX 65 A 2003
KAWASAKI KX 65 A 2002
KAWASAKI KX 65 A 2001
KAWASAKI KX 65 A 2000
KAWASAKI KX 80 2000
KAWASAKI KX 80 1999
KAWASAKI KX 80 1998
KAWASAKI KX 80 1997
KAWASAKI KX 80 1996
KAWASAKI KX 80 1995
KAWASAKI KX 80 1994
KAWASAKI KX 80 1993
KAWASAKI KX 80 1992
KAWASAKI KX 80 1991
KAWASAKI KX 80 1990
KAWASAKI KX 80 1989
KAWASAKI KX 80 1988
KAWASAKI KX 80 1987
KAWASAKI KX 80 1986
KAWASAKI KX 80 1985
KAWASAKI KX 80 1984
KAWASAKI KX 80 1983
KAWASAKI KX 80 1982
KAWASAKI KX 85 2019
KAWASAKI KX 85 2018
KAWASAKI KX 85 2017
KAWASAKI KX 85 2016
KAWASAKI KX 85 2015
KAWASAKI KX 85 2014
KAWASAKI KX 85 2013
KAWASAKI KX 85 2012
KAWASAKI KX 85 2011
KAWASAKI KX 85 2010
KAWASAKI KX 85 2009
KAWASAKI KX 85 2008
KAWASAKI KX 85 2007
KAWASAKI KX 85 2006
KAWASAKI KX 85 2005
KAWASAKI KX 85 2004
KAWASAKI KX 85 2003
KAWASAKI KX 85 2002
KAWASAKI KX 85 2001
SUZUKI RM 60 2003
SUZUKI RM 65 2005
SUZUKI RM 65 2004
SUZUKI RM 65 2003
SUZUKI RM 80 2001
SUZUKI RM 80 2000
SUZUKI RM 80 1999
SUZUKI RM 80 1998
SUZUKI RM 80 1997
SUZUKI RM 80 1996
SUZUKI RM 80 1995
SUZUKI RM 80 1994
SUZUKI RM 80 1993
SUZUKI RM 80 1992
SUZUKI RM 80 1991
SUZUKI RM 80 1990
SUZUKI RM 80 1989
SUZUKI RM 80 1988
SUZUKI RM 80 1987
SUZUKI RM 80 1986
SUZUKI RM 85 2023
SUZUKI RM 85 2022
SUZUKI RM 85 2021
SUZUKI RM 85 2020
SUZUKI RM 85 2019
SUZUKI RM 85 2018
SUZUKI RM 85 2017
SUZUKI RM 85 2016
SUZUKI RM 85 2015
SUZUKI RM 85 2014
SUZUKI RM 85 2013
SUZUKI RM 85 2012
SUZUKI RM 85 2011
SUZUKI RM 85 2010
SUZUKI RM 85 2009
SUZUKI RM 85 2008
SUZUKI RM 85 2007
SUZUKI RM 85 2006
SUZUKI RM 85 2005
SUZUKI RM 85 2004
SUZUKI RM 85 2003
SUZUKI RM 85 2002
SUZUKI RM 85 L 2017
SUZUKI RM 85 L 2016
SUZUKI RM 85 L 2015
SUZUKI RM 85 L 2014
SUZUKI RM 85 L 2013
SUZUKI RM 85 L 2012
SUZUKI RM 85 L 2011
SUZUKI RM 85 L 2010
SUZUKI RM 85 L 2009
SUZUKI RM 85 L 2008
SUZUKI RM 85 L 2007
SUZUKI RM 85 L 2006
SUZUKI RM 85 L 2005
SUZUKI RM 85 L 2004
SUZUKI RM 85 L 2003
YAMAHA YZ 125 1985
YAMAHA YZ 125 1984
YAMAHA YZ 125 1983
YAMAHA YZ 125 1982
YAMAHA YZ 125 1981
YAMAHA YZ 125 1980
YAMAHA YZ 125 1979
YAMAHA YZ 125 1978
YAMAHA YZ 125 1977
YAMAHA YZ 80 2001
YAMAHA YZ 80 2000
YAMAHA YZ 80 1999
YAMAHA YZ 80 1998
YAMAHA YZ 80 1997
YAMAHA YZ 80 1996
YAMAHA YZ 80 1995
YAMAHA YZ 80 1994
YAMAHA YZ 80 1993
YAMAHA YZ 80 1992
YAMAHA YZ 80 1991
YAMAHA YZ 80 1990
YAMAHA YZ 80 1989
YAMAHA YZ 80 1988
YAMAHA YZ 80 1987
YAMAHA YZ 80 1986
YAMAHA YZ 80 1985
YAMAHA YZ 80 1984
YAMAHA YZ 80 1983
YAMAHA YZ 85 LW 2018
YAMAHA YZ 85 LW 2017
YAMAHA YZ 85 LW 2016
YAMAHA YZ 85 LW 2015
YAMAHA YZ 85 LW 2014
YAMAHA YZ 85 LW 2013
YAMAHA YZ 85 LW 2012
YAMAHA YZ 85 LW 2011
YAMAHA YZ 85 LW 2010
YAMAHA YZ 85 LW 2009
YAMAHA YZ 85 LW 2008
YAMAHA YZ 85 LW 2007
YAMAHA YZ 85 LW 2006
YAMAHA YZ 85 LW 2005
YAMAHA YZ 85 LW 2004
YAMAHA YZ 85 LW 2003
YAMAHA YZ 85 LW 2002
YAMAHA YZ 85 SW 2018
YAMAHA YZ 85 SW 2017
YAMAHA YZ 85 SW 2016
YAMAHA YZ 85 SW 2015
YAMAHA YZ 85 SW 2014
YAMAHA YZ 85 SW 2013
YAMAHA YZ 85 SW 2012
YAMAHA YZ 85 SW 2011
YAMAHA YZ 85 SW 2010
YAMAHA YZ 85 SW 2009
YAMAHA YZ 85 SW 2008
YAMAHA YZ 85 SW 2007
YAMAHA YZ 85 SW 2006
YAMAHA YZ 85 SW 2005
YAMAHA YZ 85 SW 2004
YAMAHA YZ 85 SW 2003
YAMAHA YZ 85 SW 2002