ATHENA Piston Pin 12x37 mm for APRILIA MX 50, PEGASO 50, RX 50, RIEJU MRT 50, RR 50, BETA RR 50 and HM CRE 50 1992-2024

The ATHENA 12x37 mm S410000304007 piston pin is designed for APRILIA MX 50, PEGASO 50, RX 50, RIEJU MRT 50, RR 50, BETA RR 50 and HM CRE 50 from 1992 to 2024. Small but heavily loaded, the pin transmits the piston's thrust to the connecting rod. A marked or oval pin creates play and noise, and wears the small end.

Specifications

• Brand: ATHENA
• Manufacturer part number: S410000304007
• EAN code: 8051757062164
• For ATHENA piston
• Circlips included
• Weight: 10 g
• Engine: 2-stroke

When to replace it?

• Metallic knocking at idle or when closing the throttle.
• Pin marked, blued or scored on teardown.
• Noticeable play between the pin and the small end or the piston bosses.

Check the pin at every piston change and replace it as soon as it is marked, blued or has play. A new pin always goes in with new circlips.

Fitting tips

1. Check that the pin diameter and length match your piston (see specifications).
2. Oil the pin, the small end and the piston bosses, then push the pin in by hand, without forcing it.
3. At the same time, check the small-end needle bearing.
4. Fit new piston pin circlips, gap opposite the notch, and check they sit properly in their groove.

Why ATHENA?

Founded in 1973 near Vicenza, Athena is an Italian engine gasket specialist that has made its gaskets on its own production lines since day one, as well as a renowned manufacturer of pistons and cylinder kits. The brand supplies original equipment to manufacturers such as KTM, Ducati, Fantic, Piaggio and Triumph, and is a partner of the MXGP motocross world championship.

Spare parts and items to plan

• ATHENA cylinder kit : ATHENA P400105100003 · ATHENA P400130100001
• Piston : ATHENA S4C04000007 · ATHENA 082002
• Top end gasket kit : ATHENA
• Cylinder head and dome : ATHENA S410105308005 · ATHENA S410105308007 · ATHENA S410105308003
• Small end needle bearing : ATHENA

Frequently asked questions

Is the pin supplied with the piston?
Yes, a new piston comes with its pin. This part is for replacing a worn or lost pin, or for completing a piston sold on its own.

Are the circlips included?
Yes: this part number includes the pin and its circlips.

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 PEGASO 50 1997
APRILIA PEGASO 50 1996
APRILIA PEGASO 50 1995
APRILIA PEGASO 50 1994
APRILIA PEGASO 50 1993
APRILIA PEGASO 50 1992
APRILIA RX 50 2020
APRILIA RX 50 2019
APRILIA RX 50 2018
APRILIA RX 50 2017
APRILIA RX 50 2016
APRILIA RX 50 2015
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
HM CRE 50 2017
HM CRE 50 2016
HM CRE 50 2015
HM CRE 50 2014
HM CRE 50 2013
HM CRE 50 2012
HM CRE 50 2011
HM CRE 50 2010
HM CRE 50 2009
HM CRE 50 2008
HM CRE 50 2007
HM CRE 50 2006
HM CRE 50 2005
HM CRE 50 2004
HM CRE 50 2003
HM CRE 50 2002
HM CRE 50 2001
HM CRE 50 2000
HM CRE 50 1999
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
RIEJU RR 50 2008
RIEJU RR 50 2007
RIEJU RR 50 2006
RIEJU RR 50 2005
RIEJU RR 50 2004
RIEJU RR 50 2003
RIEJU RR 50 2002
RIEJU RR 50 2001
RIEJU RR 50 2000
RIEJU RR 50 1999
RIEJU RR 50 1998
RIEJU RR 50 1997
RIEJU RR 50 1996
RIEJU RR 50 1995
RIEJU RR 50 1994
RIEJU RR 50 1993