Boyesen SC-32AB Black 'Factory Racing' Ignition Cover Fits: Yamaha YZ250 1999-2011 Gives your bike the Factory Works look and sets your ride apart from the rest with the ultimate in race performance Boyesen ignition covers are cast from the highest grade of lightweight aluminum, providing solid engine protection and are guaranteed not to warp Individually surfaced to insure a perfect fit and seal properly, guarding the inside of engine from dirt and water; super tough powder coating resists wear and tear, outlasting stock covers Can reduce engine temperatures by as much as ten degrees