Yamaha - Air shroud, cylind - 7HD-E2652-00-00 Yamaha-F40-2003 You’ll notice the engine running

You’ll notice the engine running a little smoother

All current Mercury/Mariner Outboards 6 HP and above (without power trim)

MAR-10110-SR-B0 - HOT SHOT 10 1/8 X 10 R

YF1-43013-36-30 - PLUG

Yamaha - Air shroud, cylind - 7HD-E2652-00-00 Yamaha-F40-2003 You’ll notice the engine runningYamaha Air Shroud Cylinder Cooling System Component 7HD E2652 00 00 Overview Air shrouds are easy to overlook, but they play a big role in keeping your engine temps where they should be. This one helps direct airflow around the cylinder so heat doesnt build up in the wrong spots. Ive seen engines run hotter than expected just because airflow wasnt managed properly. When everythings in place, the motor runs smoother and handles long runs without issue.