is my prop too big or too small?

[serisdaddy]

ok i have a 87 4.3l omc cobra outdrive on a 16' thundercraft. I have a 14.25r19 stainless prop and will hit only 25-35mph on a good day @ 3000rpms, and then it starts to spit and sputter abit. I checked my drive bellow its not leaking, changed gear oil, changed plugs,added fuel water remover and, changed the fuel water seperator filter. It still did the same thing. I was told it may be my prop being too heavy, so I went out and got an aluminum prop 14 1/2 19 will this be better for my boat? what would ya'll recomend?

 

[Bondo]

Re: is my prop too big or too small?

"will hit only 25-35mph on a good day @ 3000rpms, and then it starts to spit and sputter abit."

You're going Lean at High RPMs,.............

Fix the Carb. 1st,........... Then worry about the Prop........

 

[cm5408]

Re: is my prop too big or too small?

sounds exactly like there is water in the fuel bowl of the carb, and or in the gas tank.

do you have a fuel / water seporator? change that.

 

[marunr]

Re: is my prop too big or too small?

sounds exactly like there is water in the fuel bowl of the carb, and or in the gas tank.

do you have a fuel / water seporator? change that.

ummm...he said he already did that.

serisdaddy, follow bondo's advice. he'll steer you right.

 

[QC]

Re: is my prop too big or too small?

BTW, hold on to that SS prop . . .