ATHENA Needle Bearing for BETA RR 50, KTM SX 50, APRILIA MX 50, RX 50 and RIEJU MRT 50 1995-2026

ATHENA offers this needle bearing for BETA RR 50, KTM SX 50, APRILIA MX 50, RX 50 and RIEJU MRT 50 1995-2026. Fitted in the small end of the connecting rod, it carries the piston pin and works on every stroke of the piston, at very high revs.

Why replace it?

The benefits:

• To be replaced every time the piston is.
• Remove small-end play.

Why choose ATHENA?

Athena, founded in 1973 by Giovanni Mancassola near Vicenza and based in Alonte (Italy), designs gaskets, pistons and cylinder kits; it supplies original equipment to manufacturers such as KTM, Ducati, Fantic and Triumph.

When should you replace it?

Every time you change the piston: a worn needle bearing develops play, runs hot and can break, causing major engine damage. Also replace it if the needles are marked or blued, or if it turns with tight spots.

Specifications and fitting tips

• Dimensions: 12x15x14.8 mm
• Manufacturer part number: MNB120150148A

Spare parts and items to plan

• Piston : ATHENA S4C04000007 · ATHENA S4C05000003
• Piston pin clips : WISECO · VERTEX
• Top-end gasket kit : ATHENA S410130006012 · ATHENA S410130001004

Compatibility

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

Fits:
APRILIA MX 50 2004
APRILIA MX 50 2003
APRILIA MX 50 2002
APRILIA RX 50 2014
APRILIA RX 50 2013
APRILIA RX 50 2012
APRILIA RX 50 2011
APRILIA RX 50 2010
APRILIA RX 50 2009
APRILIA RX 50 2008
APRILIA RX 50 2007
APRILIA RX 50 2006
APRILIA RX 50 2004
APRILIA RX 50 2003
APRILIA RX 50 2002
APRILIA RX 50 2001
APRILIA RX 50 2000
APRILIA RX 50 1999
APRILIA RX 50 1998
APRILIA RX 50 1997
APRILIA RX 50 1996
APRILIA RX 50 1995
BETA RR 50 2024
BETA RR 50 2023
BETA RR 50 2022
BETA RR 50 2021
BETA RR 50 2020
BETA RR 50 2019
BETA RR 50 2018
BETA RR 50 2017
BETA RR 50 2016
BETA RR 50 2015
BETA RR 50 2014
BETA RR 50 2013
BETA RR 50 2012
BETA RR 50 2011
BETA RR 50 2010
BETA RR 50 2009
BETA RR 50 2008
BETA RR 50 2007
BETA RR 50 2006
BETA RR 50 2005
BETA RR 50 2004
BETA RR 50 2003
BETA RR 50 2002
BETA RR 50 2001
BETA RR 50 2000
BETA RR 50 1999
BETA RR 50 1998
KTM SX 50 2026
KTM SX 50 2025
KTM SX 50 2024
KTM SX 50 2023
KTM SX 50 2022
KTM SX 50 2021
KTM SX 50 2020
KTM SX 50 2019
KTM SX 50 2018
KTM SX 50 2017
KTM SX 50 2016
KTM SX 50 2015
KTM SX 50 2014
KTM SX 50 2013
KTM SX 50 2012
KTM SX 50 2011
KTM SX 50 2010
KTM SX 50 2009
KTM SX 50 2008
KTM SX 50 2007
KTM SX 50 2006
KTM SX 50 2005
KTM SX 50 2004
KTM SX 50 2003
KTM SX 50 2002
RIEJU MRT 50 2024
RIEJU MRT 50 2023
RIEJU MRT 50 2022
RIEJU MRT 50 2021
RIEJU MRT 50 2020
RIEJU MRT 50 2019
RIEJU MRT 50 2018
RIEJU MRT 50 2017
RIEJU MRT 50 2016
RIEJU MRT 50 2015
RIEJU MRT 50 2014
RIEJU MRT 50 2013
RIEJU MRT 50 2012
RIEJU MRT 50 2011
RIEJU MRT 50 2010
RIEJU MRT 50 2009