johnson motor help

[greenleemm]

I just bought a new boat, it has a 75 johnson seahorse

MODEL: J75TRLCIM
SERIAL: J5485727

It is on an '81 Seaswirl openbow
an looking for info on engine because I cannot seem to locate this model anywhere on the net to get a manual.
also I was interested in what ratio gas mix to use on this engine? 24:1 or 50:1 or what?

 

[rickdb1boat]

Re: johnson motor help

"CI" indicates the motor is a 1981 model. Factory Manuals can be found at the link below or iboats sells generic ones..50:1 is the correct mix...

http://www.kencook.com/evinrudejohnsonmanuals/index.cfm?fuseaction=models.main&year=1981&ID=62945 ] Click Here [/url]

 

[greenleemm]

Re: johnson motor help

was also looking to sea what step I could take to get a little more oomph. would a 75hp o/b just be kinda slow on a 16' fiberglass openbow? would a different prop add some speed? or a stabilizer fin? I dont know how fast it goes because of no gauge but it seems a bit slow. this is my first boat though and maybe I am just expecting too much?

 

[AlanR]

Re: johnson motor help

You have a 1981 Johnson 75 Seahorse. It uses 50:1 Oil mixture. heres a link to the parts manual on the Johnrude website

http://epc.brp.com/scripts/EmpartIS...8&mode=2&loadImg=no&assem=33165&level=1&hist=

Hope this helps

 

[AlanR]

Re: johnson motor help

Sorry on my slow response. there was no responses when i started typing. Anyways What size of prop do you have on it

 

[greenleemm]

Re: johnson motor help

good question. i asume the original.
i dont have specifics and not near boat.
in general is there a better design or size that would bring out all of the engines potential?

 

[AlanR]

Re: johnson motor help

Post in the prop section with your motor and boat config theyd be able to help more than us but from what your saying id put like a 16 or 17 on it if not a really heavy boat

 

[tashasdaddy]

Re: johnson motor help

basically all you have told us, is you have a 75 hp, on a 81 sea swirl. what length,, what are the numbers on the prop. is it possible the hull is water logged. you can take the manual number and look on ebay. does it sound like the motor is running correctly? we can guess for the next year, there are 14 different 1981 sea swirl models.

 

[tashasdaddy]

Re: johnson motor help

your answer is i your other post. keep your post together, it's easier on all of us. unfortunately you are under powered.