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1990 50hp Johnson Prop
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<blockquote data-quote="Johny25" data-source="post: 301886" data-attributes="member: 7791"><p>Your recommended RPM is 5000 so assuming the 15 is representing pitch you likely could go to a 14 pitch and pick up some RPMs. This is assuming though and I do not like to assume anything. </p><p></p><p> Was the RPM reading taking when the prop was damaged already? If so this probably accounts for the 4500 rpm reading and you likely have the correct size prop, just needs replacement. If you have the money and you don't run in in shallow or bad debri filled water an SS will give you better performance. I would stick with the 15 pitch assuming that's what the 15 means. Usually prop stamp will read 11.25X15 or something to that effect.</p></blockquote><p></p>
[QUOTE="Johny25, post: 301886, member: 7791"] Your recommended RPM is 5000 so assuming the 15 is representing pitch you likely could go to a 14 pitch and pick up some RPMs. This is assuming though and I do not like to assume anything. Was the RPM reading taking when the prop was damaged already? If so this probably accounts for the 4500 rpm reading and you likely have the correct size prop, just needs replacement. If you have the money and you don't run in in shallow or bad debri filled water an SS will give you better performance. I would stick with the 15 pitch assuming that's what the 15 means. Usually prop stamp will read 11.25X15 or something to that effect. [/QUOTE]
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