I've got a 90 Yamaha I fought with last year. A Yamaha mechanic told me the easy way to get the impeller in the housing. Coat it with vegetable oil and turn driveshaft clockwise while pushing down on top housing. It popped right in. Also fought hard start for 3 years. Had to use the bypass every time I cold started it. Turned out my fuel bulb was the problem. Replaced it and starts fine now.
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