1988 100HP mercury ELPTO max rpm/prop recommendation

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
12,961
Here are some guidelines regarding venting the prop. This is an OMC prop but the locations of the holes will be pretty much the same on a Merc prop ventingprops.gif
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
12,961
Some Mercury props have huge holes and a variety of plastic plugs allowing a choice of five levels of venting.
 
Joined
Apr 24, 2017
Messages
17
hey guys sorry for the delay, weather here has been terrible. Got the boat out twice with new digital tach but it jumps all over as rpm's increase. I have it set on 2 stroke 4cyl but since its an outboard with no distributor, do I need to set the tach to 2 stroke 1cyl to get good readings? its the type that wraps around the coil/plug wire and im thinking without a distributor the tach should only care a bout the one hole its reading. sound right to you guys, any experiences?
 
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