PROX crankshaft bearing and seal kit for KTM EXC 400 LC4, BETA RR 400 and POLARIS OUTLAW 525 IRS from 1989 to 2012

PROX offers this crankshaft bearing and seal kit for KTM EXC 400 LC4, BETA RR 400 and POLARIS OUTLAW 525 IRS from 1989 to 2012. The crankshaft spins on two large bearings in the cases, protected by oil seals. 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 all bearings/seals required to replace the component (unless otherwise stated)

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

Compatibility

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

Fits:
BETA RR 250 2007
BETA RR 250 2006
BETA RR 400 2009
BETA RR 400 2008
BETA RR 400 2007
BETA RR 400 2006
BETA RR 450 2009
BETA RR 450 2008
BETA RR 450 2007
BETA RR 450 2006
BETA RR 525 2009
BETA RR 525 2008
BETA RR 525 2007
BETA RR 525 2006
KTM EXC 250 2007
KTM EXC 350 LC4 1994
KTM EXC 400 LC4 1998
KTM EXC 400 LC4 1997
KTM EXC 400 LC4 1996
KTM EXC 400 LC4 1995
KTM EXC 400 LC4 1994
KTM EXC 400 LC4 1993
KTM EXC 400 RACING 1999
KTM EXC 450 2007
KTM EXC 450 RACING 2007
KTM EXC 450 RACING 2006
KTM EXC 450 RACING 2005
KTM EXC 450 RACING 2004
KTM EXC 450 RACING 2003
KTM EXC 500 LC4 1991
KTM EXC 500 LC4 1990
KTM EXC 500 LC4 1989
KTM EXC 520 2003
KTM EXC 520 2002
KTM EXC 520 2001
KTM EXC 520 2000
KTM EXC 520 RACING 2002
KTM EXC 520 RACING 2001
KTM EXC 520 RACING 2000
KTM EXC 520 RACING 1999
KTM EXC 525 RACING 2007
KTM EXC 525 RACING 2006
KTM EXC 525 RACING 2005
KTM EXC 525 RACING 2004
KTM EXC 525 RACING 2003
KTM EXC-G 525 RACING 2006
KTM EXC-G 525 RACING 2005
KTM EXC-G 525 RACING 2004
KTM EXC-G 525 RACING 2003
KTM SMR 450 2007
KTM SMR 450 2006
KTM SMR 450 2005
KTM SMR 450 2004
KTM SMR 525 2005
KTM SMR 525 2004
KTM SMR 560 RACING 2007
KTM SMR 560 RACING 2006
KTM SX 450 2007
KTM SX 450 2006
KTM SX 450 RACING 2006
KTM SX 450 RACING 2005
KTM SX 450 RACING 2004
KTM SX 450 RACING 2003
KTM SX 500 1995
KTM SX 500 1994
KTM SX 500 1993
KTM SX 520 2003
KTM SX 520 2002
KTM SX 520 2001
KTM SX 520 2000
KTM SX 520 RACING 2002
KTM SX 520 RACING 2001
KTM SX 520 RACING 2000
KTM SX 525 2006
KTM SX 525 2005
KTM SX 525 2004
KTM SX 525 2003
KTM SX 525 RACING 2006
KTM SX 525 RACING 2005
KTM SX 525 RACING 2004
KTM SX 525 RACING 2003
KTM XC 450 ATV 2009
KTM XC 450 ATV 2008
KTM XC 525 ATV 2012
KTM XC 525 ATV 2011
KTM XC 525 ATV 2010
KTM XC 525 ATV 2009
KTM XC 525 ATV 2008
POLARIS OUTLAW 450 MXR 2010
POLARIS OUTLAW 450 MXR 2009
POLARIS OUTLAW 525 2007
POLARIS OUTLAW 525 IRS 2011
POLARIS OUTLAW 525 IRS 2010
POLARIS OUTLAW 525 IRS 2009
POLARIS OUTLAW 525 IRS 2008
POLARIS OUTLAW 525 S 2010
POLARIS OUTLAW 525 S 2009
POLARIS OUTLAW 525 S 2008