Which prop?

[jollyunlucky]

hello, i recently broke the factory prop on my 1983 4HP Johnson Sea Horse and have been looking at new ones. I looked on the Johnson website and found that ther are 3 diffent props i can buy for this motor, thers a 7 1/2x6, a 7 1/2x7 and a 7 1/2x6 1/2 prop available for my motor and i am wondering which one would be best for my boat. I am using this motor on a 12ft deep-v fishing boat. Thanks.

 

[jollyunlucky]

Re: Which prop?

i guess no one wants to help me. ok, i just got a 7 1/2x6 anyway.

 

[walleyehed]

Re: Which prop?

If you would have read the post at the top about "required information", you may have got some help, quicker...no tach, no Idea what to recommend.

 

[jollyunlucky]

Re: Which prop?

but who puts a tach on a 4hp boat motor on a 12ft aluminum boat? i pretty much gave all the information i could that was recomended in the thread that said "required information" i have no way of finding the rpm's on my boat. that max recomended rpm by factory is 4500-5500.

 

[Almeja]

Re: Which prop?

It's very unlikely that anyone around here knew what sort of advice to give about propping a 4hp motor. Most of the prop discussion is in regards to much bigger boats. <br /><br />For my part, I've never owned an outboard that small. 4 HP won't be pushing a 12' boat very fast no matter what prop you put on it so you might as well go with the low pitch (as you did).

 

[walleyehed]

Re: Which prop?

And "if" the rpm didn't matter, why would the factory even give an RPM range?????<br />The tiny-tach is the perfect instrument for that size of an outboard and it's cheap. It all really depends on how long you intend the engine to last.