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The water pumps have been failure point for some with most of them occuring on the Sidewinder/Thundercat models.  This design elimintes the oem pin design that was often the failure point. With the key integraged into the shaft it allows the shaft to maintain its strength as it is not weakend by the pin holes. 

Billet 3 Cylinder Water Pump Impeller


    Yamaha 4 Stroke Snowmobile Specialists

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