21/01/2020
Leta take a moment to talk about impellers...
This squishy little block of rubber sits on the driveshaft of your outboard and draws cooling water up through the leg and into the power head, cooling the cylinder block and preventing overheating
However, over time this rubber goes hard, the flexible tips become less flexible, curl up or wear down to the point where they simply dont produce an effective flow.
A complete impeller kit costs around £20 depending on the engine, and are worthwhile changing at every service to be on the safe side!
Pictured below, new and old impellers from a Yamaha 9.9, quite a difference!