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Don't trust my tachometer.
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<blockquote data-quote="muskiemike12" data-source="post: 290129" data-attributes="member: 4897"><p>Something is wrong cause I just plugged your numbers in here https://www.go-fast.com/Prop_Slip_Calculator.htm and it is impossible to run 27mph at 4500 rpms. At 27 mph you should be pushing around 5500 rpm's with that set-up. What is your tach set at on the back? Do you know the gear ratio of the new lower unit?</p></blockquote><p></p>
[QUOTE="muskiemike12, post: 290129, member: 4897"] Something is wrong cause I just plugged your numbers in here https://www.go-fast.com/Prop_Slip_Calculator.htm and it is impossible to run 27mph at 4500 rpms. At 27 mph you should be pushing around 5500 rpm's with that set-up. What is your tach set at on the back? Do you know the gear ratio of the new lower unit? [/QUOTE]
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Don't trust my tachometer.
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