Posts: 295
Location: Southern Ontario, Detroit River and Lake StClair | I got thinking about things today at work and that 40mph sound about right for 4200rpm with a 21p prop. That got me thinking that your tach is probably reading right. With a light load and a 21p prop you should be able to get around 5000 rpm with that motor boat set up. One thing you mite want to check is that your throttle linkage is set right and that the motoris getting an actual full throttle when you have the hammer down. If your only getting 4200rpm right now going to a 19p or even a 17p I don't think will get you to 5500rpm which about where you should be running. With the motor off take off the cowl. Have some one give it full throttle while you watch the linkage move. Once its at max try moving the linkage by hand some more and see it moves much. It if does that could very well be your problem.
Good Fishin'
Tim
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