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Ready to install, ProX Piston Kits are supplied complete with piston rings, wrist pin, and circlips. ProX pistons are precision machined on the latest, state of the art CNC equipment and use the same low-expansion, low-friction piston alloy all major Japanese engine manufacturers use. Uses an OEM style tin coating to assist the break-in process when you first start your machine. Fits: Yamaha GP 1200 R 2000-2003, XL 1200 LTD 1998-2001, XLT 1200 2001-2005, GP 800 R 1998-2005, XL 800 2000-2001, XLT 800 2002-2004. Notes: 79.91mm bore.