Do you remember how many rpm's you were getting wide open? Like already said you will loose 400 rpm's from whatever the 19 pitch you are running now. With my experience with props I doubt you will be able to turn the 21 pitch at the correct rpm range for your motor. You need to be at 5,500 rpm's with a v4 johnson. I have the same motor and I run a 19 pitch on a 1,000 pound boat.
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