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OMC JOHNSON SEAHORSE ser#15R75C

E

easytony

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" Don'thave a service manu

" Don'thave a service manual,I need info. on spark plug gap as well as lean/rich mix and idle settings for initial start-up. Does this engine have points? If so, what are the gap specs? Any info. would be a great help. Thanks for the redirect JOE. I've taken a lot of long strolls,but, that was a pretty long scroll,is there a shortcut? "
 
"Tony... A service manual can

"Tony... A service manual can probably be obtained at:

http://www.marineengine.com/manuals/johnson/

Plug gap: .030 - - Point gap: .020

To continue with this thread, simply reply below.

To enter a post about a new topic/engine, simpy click on the previous page anywhere that won't activate anything, then hit your END key. That'll drop you down to that "Enter New Conversation" button.

Joe
"
 
" Thanks Joe, that info. is a

" Thanks Joe, that info. is a big help.I DID FORGET to mention on the new post that this is a 15 HP, but it acts like my old 9.5 somewhat,I used starting settings as best I could remember for the 9.5 and the 15 cranked after awhile,but,no matter how I made adjustments it would not hold a Idle when I removed my hand from the controll handle. any ideas? appreciate the shortcut,easytony "
 
"Tony... Of course, any settin

"Tony... Of course, any setting will require that the compression and spark are of good quality to begin with. The mechanical idle stop would be the large black knob on the port side of the engine, however many of them freeze and are really useless unless replaced.

Proper carb settings would be as follows, assuming that the carburetor is absolutely clean. If it's fouled even slightly, it'll require removing, cleaning, and rebuilding.

(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)

Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

Joe
"
 
" Thanks again Joe,I willput t

" Thanks again Joe,I willput that info. to work in the morning and see what happens. Have a good one.Tony "
 
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