HI guys. 1998 chapparal 200LE 20 ft. 4.3 mercruiser 190hp

how fast should this boat go? wot range is 4400-4800. currently with 21 pitch prop 4800 rpm, 42 mph half to full load. I switched to a 23 pitch prop to get more speed. with 23 pitch prop 4400 rpm, 42 mph. what gives? the previous owner said he had it up to 50 mph with just him on board. what can I adjust? thanks for any help. I want more speeeeed. I think the 4.3 is almost undersized for a 20 footer.

how fast should this boat go? wot range is 4400-4800. currently with 21 pitch prop 4800 rpm, 42 mph half to full load. I switched to a 23 pitch prop to get more speed. with 23 pitch prop 4400 rpm, 42 mph. what gives? the previous owner said he had it up to 50 mph with just him on board. what can I adjust? thanks for any help. I want more speeeeed. I think the 4.3 is almost undersized for a 20 footer.

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