RPM
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Vikingstaff
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Which Yamaha 90 HP? Based on the Yamaha RPM WOT Chart (attached below) if its a basic 90 HP Yamaha then the range would be 4500-5500 which is basically where you are at.
If its a f90HP Yamaha, then the range is 5000-6000, which you have some range to play with in regards to dialing in the pitch of your prop to increase performance.
https://www.rubexprops.com/boat-propellers/rpm-range/?make=Yamaha
Next up is the only Yamaha and Mercury Prop Selectors. Once you know for sure which motor, go to each website. Plug in your boat and motor information along with intended use. It will give you some suggestions. They are not perfect, but they help get you close. See if your current prop is recommended for that motor in the diameter and pitch that you have.
http://www.yamahapropselector.com/propSelector/web/
https://www.mercurymarine.com/en/us/propellers/selector/#!/step-one
Hope all of this helps find the answers you are looking for. Best of Luck!
If its a f90HP Yamaha, then the range is 5000-6000, which you have some range to play with in regards to dialing in the pitch of your prop to increase performance.
https://www.rubexprops.com/boat-propellers/rpm-range/?make=Yamaha
Next up is the only Yamaha and Mercury Prop Selectors. Once you know for sure which motor, go to each website. Plug in your boat and motor information along with intended use. It will give you some suggestions. They are not perfect, but they help get you close. See if your current prop is recommended for that motor in the diameter and pitch that you have.
http://www.yamahapropselector.com/propSelector/web/
https://www.mercurymarine.com/en/us/propellers/selector/#!/step-one
Hope all of this helps find the answers you are looking for. Best of Luck!