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Info about 3hp evinrude

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claudenorm2

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" Hi, I need info about a 3hp&

" Hi, I need info about a 3hp(I think) evinrude year ??? Could you help me please? Serial:3802A C560734.

Is it normal upper cylinder 70 psi, lower 75 psi?
Spark plug j6j champion, gap ?
Oil mixture 50-1 is it right?

thanks a lot claudenorm2 "
 
" 3802 is 1968.
Chart plug i

" 3802 is 1968.
Chart plug is Champion J6C - .03 Gap. I Think J6J at .03 is better (it's hot) for older motors unless recently overhauled.
50:1 is right. You should run at least 89 Octane. In my experience, you get a lot less plug fouling if you use a blended synthetic like Penzoil Marine® Premium Plus Outboard 2 Cycle Oil. All of the major outboard companies have additives to keep down the carbon build-up.
If you think you can't use the fuel-oil mix within 60 days, you should also use a fuel conditioner when you first buy the gas. If you have not done this and your mix is old, get rid of it.
If you do your compression test when the motor is warm from running, and using a screw in guage, you may get a different reading.
Among others, I own and run 7 OMC small outboards from 1965-1973, and I consider a 5 PSI variation within normal range.
Hope this helps. "
 
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