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Need Help on my Yamaha 225 four stroke

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My Yamaha 225 Four strokewhen i am running around 40 mph it runs good but when I try to run over that is sounds like i am running out of gas and then I back back down and it runs fine. I have changed the water seporator and the fuel filter and, I just found out there is another filter on the top of the motor. I am going to change that. Does anybody know of any other reason it would do that? Trying to save from bringing it to the shop because everytime I bring my motor to the shop in the past(not this one is the first problem) they never fix the peoblem it is any doind the same thing after I spent a lot of money.

Thanks for the help.
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   LUCKY-MAN
Im pretty sure they also have a high pressure fuel filter with a screen I have two 150's and I was told that it looks like a box and the screen is inside of it I've never had to change mine but my buddy was having the same problem as you he just cleaned the screen and it solved it for him
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   Michael64
Thanks for the info, found out today that it is the bad pressure pump. I changed the screen and we went and ran it with a fuel pressure gauge and it did it again. The pressure drop to 20 lbs so I will have to order a pump Tuesday..
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