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Phil S
09-16-2010, 10:22 PM
I am selling a OMC Ballistic prop that is a 15 spline. It fits my 89 model Cobra shaft and a potential buyer asked if it would fit his 91 Cobra (he didn't know how many splines his shaft has).

I was under the impression that OMC changed from a 13 spline shaft to a 15 spline shaft in either 1988 or 1989. Anyone know if that is correct ? And if that is correct, wouldn't a 91 model have to be a 15 spline ?

Sorry for such a dumb question......but you should really be used to that from me by now ! :) :boggled:

Thanks in advance !

Phil S

mrfixxall
09-16-2010, 11:38 PM
I am selling a OMC Ballistic prop that is a 15 spline. It fits my 89 model Cobra shaft and a potential buyer asked if it would fit his 91 Cobra (he didn't know how many splines his shaft has).

I was under the impression that OMC changed from a 13 spline shaft to a 15 spline shaft in either 1988 or 1989. Anyone know if that is correct ? And if that is correct, wouldn't a 91 model have to be a 15 spline ?

Sorry for such a dumb question......but you should really be used to that from me by now ! :) :boggled:

Thanks in advance !

Phil S


all the stern drive models have 15 splines,,the 13 spline would be on the smaller omc outboard motors (evinrude/Johnson) in the 50 hp range..

dsparis
09-17-2010, 06:42 AM
Fixx is correct. My 91 KC has 15 and my 77 stinger 70 has 13

Phil S
09-17-2010, 07:14 AM
Thank you, Thank you !!

With kind regards,

Phil S.