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1972 Mercury 650E factory propeller spex

C

ChipperStrauss

Member
I can't seem to find the spex for what the factory standard propeller should be on my 1972 Mercury 650E 3 cyl outboard. I want to make sure that someone in past has not exchanged the propeller. I have been reading up on setting the idle mixture and speed and discovered the wrong prop can make the idle speed while in gear too high while in neutral.
Please help.
 
The motors came with a prop that was decided on by the dealer using the boat's specifications ie. weight, length, gear and Nr. of people - the range was 9.5" to 24".
You use the tach to figure out which prop lets the motor rev to its max rpm which is 5300; when you have the right prop you set the low speed and idle settings to the book settings. What is your current max rpm? The prop has no effect on neutral rpm.
 
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