2004 SR Johnson 2-stroke 40, 50HP Service Repair Manual P/N 5005640, Page 56Get this manual
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INSTALLATION AND PREDELIVERY PROPELLER SELECTION
1 Percentagehorsepower (kw) 2 Engine RPM 3 Horsepower curve 4 Ful thottle operating range 5 Midpoint(u" thottle operating rangehorsepower