Revving Through History: The 1978 Keystone Yamaha YZ250 Motocross Bike Nestled in the heart of Warren, Ohio, the Motozilli Museum stands as a testament to the rich heritage of motocross and its impact on the local community. Today, we proudly unveil a prized addition to our collection: the 1978 Keystone Yamaha YZ250 Motocross bike, graciously loaned to us by none other than George Quay. George Quay, a pioneering figure in the motocross world, laid the foundation for Keystone in the mid-1970s. Re