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90 hp Yamaha help please

20055 Views 8 Replies 4 Participants Last post by  Too much junk, 
Too much junk
My 04 90 hp yamaha is running low water pressure. At 5000 rpm it has about 15 lbs of pressure. At idle almost none. The pisser stream is weak at all ranges. Does this motor have a water bypass? Someone told me that it can get a grain of sand in it and wont close causing this. I would appreciate any help please. Casey
Had impeller change last year
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Emerald Ghost
Ditto with X Shark.
My Yamaha goes thru impellers / pumps twice as often as older motors.
I even resorted to having a water pressure gauge installed.
Do the housing, and not just the impeller. It is an easy job.
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