Yamaha - Intake Manifold Gasket Air Intake Sealing 6EK-13761-00-00 / 6EK-13761-01-00. Overview. Gaskets aren't the most exciting parts, but when one fails, you'll know it quick-rough idle, poor performance, or air leaks that throw everything off. I've replaced plenty of these on Yamaha setups, and it's one of those fixes that can bring an engine right back to life. This gasket sits right where airflow matters most, so it needs to seal clean and tight every time. Get it right, and the motor breat