I have a Ninja Kawasaki F4 750cc 1990. When I bought it, the motorbike came with some "K&N can filters". I took them off to clean the carb; however, I am having a hard time installing them I noticed I have two rights and two left. How should I install them (counting from the rpm adjuster knob/screw throttle knob) Left Left Right Right or Left Right Left Right. Any input will be appreciated.