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what size prop do I need 1972 50 hp Johnson

rivins

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Im running a 12 3/4" x 21 prop on a 50 HP Johnson I have this on a 16' simmons sea skiff. It revs up in neutral but wont rev up in gear. This motor
runs great until I put it in gear. It seems like ist moving kinda fast at idle. But not sure what els to look for ?
 
If the motor is running ok, I'd say your prop has way too much pitch. I run the same motor with a 17" pitch prop on a 15 foot f/g boat. Runs about 30 mph, turning 5,000 rpm. I tried a 21" pitch, just because I had one. The boat wouldn't even plane out.
 
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