So far it has been a great experience! I received my new Yamaha 421 lower unit on time. It looks great and bolted on with no problem. I pumped in new oil... I ran the motor with earmuffs, to check water pump operation... no problem... Now I am anxious to get the boat in the water, to water test and follow the SEI recommended break-in period... I will report back and let you know how it goes.... Regards, Fisherman
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My SEI experience installing new 421 lower unit
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