Wipe the inside of the housing with a clean cloth to remove any loose debris
Thoroughly clean both the engine block and head surfaces
My engine is a Mercury 40HP 4-stroke
Brand Part Number Mercruiser 26-88397A1 Sierra 18-2644 GLM 87501 JRKZRAML 88397A1
What's the main difference between this and the OEM Yamaha part
Carburetor Assembly – Fits Tohatsu/Nissan 15HP & 20HP 4-Stroke (Replaces 3BJ-03100-0, 3BH-03100-0) 210HP Wipe the inside of theProduct Details This is a complete Carburetor Assembly Fits Tohatsu Nissan 15HP & 20HP 4 Stroke outboard engines, including F15C, MFS15C, NSF15C, F20C, and MFS20C models manufactured between 2008 and 2014. It is engineered as a direct fit, aftermarket replacement to restore original engine performance and fuel delivery. It serves as a direct replacement for Tohatsu Nissan part numbers 3BJ 03100 0, 3BH 03100 0, 3AZ 03133 0, 3BH031000M, 3AZ031330M,