A 450 is enough power. Well, not for Cylinder Works and our new YZF450 big bore kit. This kit is completely stealth and bolts right in. It fits the 2010-12 YZF450 and comes with a new cylinder matched with a Vertex Piston kit and full top end gaskets. These kits are great for YZF450 owners who just want more power from their YZF450.
The complete Cylinder-Works YZF450 big bore kit is only $599.95
Cylinder Works Complete Big Bore kit for the Yamaha YZF450 2010-12
Part #21005-K01 $599.95