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Old 10-14-2010
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For prolonged running, a pleasure boat engine a good operating speed is around 85% of maximum continuous rated RPM (see the engine data plate)
assuming the propeller size is correct and the engine can reach maximum rpm).
See this list for approximate rpm:

GM - 4JH - 3/4JH2 series 2900rpm
YM series Depending on WOT rpm 2600-2900rpm
4LH and 6LY series 2650rpm
6LP and 3/4JH3 series 3000rpm
3/4JH4 series 2400rpm
6CX series 2200rpm
Rod Johnson
First Sight PS31 #128
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