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What prop should I have on a mariner optimax 90hp, which is on a Quick silver 640 boat

Causer08

New member
Hi just wondering if anyone can tell me what size prop I should have on my mariner optimax 90hp it’s on a quick silver 640 , it has a spitfire 17 pitch (4 blades ) at the minute but only getting 4400rmp thanks
 
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