The cylinder gasket set provides a seal between the cylinder head and cylinder block to maintain proper compression and prevent air leakage.It compensates for minor irregularities between the mating surfaces, the engine operates within its design specifications. Compatible With: 500 (1996–2012), 450 (2006–2007), 400 (2001–2011), 400 (2010–2013), 500 (1999–2012), BIG BOSS 500 (1998–1999), SCRAMBLER 500 (1997–2003), ATP 500 (2004–2005), WORKER 500 (1999–2001), 500 (1999–2003), XPLORER 500 (1997), XPEDITION 425 (2000–2002). Item Type: Motorcycle Cylinder Gaskets Full Kit Brand: