ATHENA offers you this replacement twin ring piston for the top engine ATHENA Big Bore P400485100021 mounted on YAMAHA YZF 450cc and YAMAHA WRF 450cc. This piston will allow you to restore your cylinder to its original performance. Ideal in case of wear it is available in dimension A in 97,94mm and B in 97,95mm thus allowing to palliate the loss of compression of the friction of the piston in the cylinder. This piston is delivered with its rings, pin and clips in C. We strongly advise you to mount the piston with new seals to avoid any compression loss. We recommend to change the piston every 10 000 km or 35 hours maximum!

Fits on:

YAMAHA WR 450 F (CJ04) 450 2004

YAMAHA WR 450 F (CJ04) 450 2003

YAMAHA WR 450 F (CJ07) 450 2005

YAMAHA WR 450 F (CJ09) 450 2006

YAMAHA WR 450 F (CJ12) 450 2007

YAMAHA WR 450 F (CJ13) 450 2011

YAMAHA WR 450 F (CJ13) 450 2010

YAMAHA WR 450 F (CJ13) 450 2009

YAMAHA WR 450 F (CJ13) 450 2008

YAMAHA WR 450 F (DJ03) 450 2015

YAMAHA WR 450 F (DJ03) 450 2014

YAMAHA WR 450 F (DJ03) 450 2013

YAMAHA WR 450 F (DJ03) 450 2012

YAMAHA YZ 450 F (CJ03) 450 2003

YAMAHA YZ 450 F (CJ05) 450 2004

YAMAHA YZ 450 F (CJ06) 450 2005

YAMAHA YZ 450 F (CJ10) 450 2009

YAMAHA YZ 450 F (CJ10) 450 2008

YAMAHA YZ 450 F (CJ10) 450 2007

YAMAHA YZ 450 F (CJ10) 450 2006