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sst prop for 1979 115 evinrude compatability on a 120 evinrude

J

John Hoefen

Member
Hi,
I still have my sst prop from my old 1979 evinrude. I now have a 1988 120 hp. evinrude.I did have the sst prop on my 120 but it didnt perform on the 19 mfg. I now have a 19 ft, seanymph and wonder if the sst could be used on this lighter boat. The sea nymph now screams with the aluminum prop.
 
What pitch ???----------------The stock lower unit on the 120 has a different gear ratio I believe.-------The 120 HP has more cubes and more punch.----------------Then of course the condition of the motor comes into the picture / equation.----------You need a tachometer to make concrete decisions here.
 
My '75 115 Johnny 3 blade stainless 13 x 18 was placed on a new ETEC 130, same boat. It turned 5200 on the old and 5800 on the TEC and gained about 6 mph maybe a little more
 
Dont know the pitch.Cant read any numbers on the prop.My 120 has the number on the end by the splines.Going to check the tach.in the past it would float some so might be time for a new one.
Thanks
 
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