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The cooling system is primarily made up of water pumps. These pumps move the coolant through the system with bearings, an impeller, a shaft, and seal.There are few components of a water pump that can actually wear out and cause troubles.
For leaks, it is best to ask your mechanic to check the weep hole. If you have some ideas about it and are looking for impeller kits or Yamaha Outboard Thermostat the you can visit impellerfeller.co.uk, they provide impeller, thermostat, gaskets and many other kits for water pumps, boat, engines and etc.
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