Smoke is normal.? You're burning oil (or at least, you better be.)? It can be
excessive for several reasons, from mechanical to mixture.? The things you can
do yourself include making sure that your gasoline and oil are fresh, and that
they are mixed accurately according to the ratio specified for your motor.?
Cleaning up the carb will help.? Make adjustments to the rich/lean mix?(don't
go to extremes in either direction) and observe any changes.
In your situation, it would probably be a great idea to walk it into a shop and
ask for a tune-up.? In the process they can check compression and the like.?
You want your O.B. to be completely reliable.
If you're keen on learning this motor inside and out, owner's and parts manuals
may be available.? You'll need your model number.? Check here for starters:
http://www.iboats.com/Evinrude_4_hp_Outboard_Manuals_1973_1989/dm/cart_id.194483907--category_id.392412--list_time.1215801048--session_id.863042598--view_id.439557
As for the?"widening" part, I believe you're describing a cavitation plate.?
Keeps surface air from being sucked down to the propeller, where it will do
damage to the prop's surface.
By the way, if no one has checked the level of gearcase lubricant in the bottom
of the shaft, that needs to be done.? There's a trick to filling it -- ask if
you need to do this.
-----Original Message-----
From: Andrei Caldararu <[EMAIL PROTECTED]>
To: For and about Montgomery Sailboats <[email protected]>
Sent: Fri, 11 Jul 2008 12:06 pm
Subject: M_Boats: Outboard question
I have a couple of quick questions on the outboard that came with my
M-17. It is the original 1981 Evinrude Yachtwin 4hp two cylinder long
shaft that came with the boat. I had the spark plugs and water pump
impeller replaced on it when I got it.
It works fine now, but the main issue I have with it is about how much
should it be in the water? As it is now mounted on my M-17, it only
sticks in the water to the first widening of the shaft above the
propeller (you may be able to tell that English is not my mother
tongue :-)). My concern is this: way higher above the waterline there
are a number of small holes in the shaft, and when running the motor
there is smoke and a slight spewing of water coming out through them.
This smells, and is noisy. Plus the exhaust seems to be unusually
"smoky". The motor has not been used for about 6-7 years. Could there
be some slush-old oil in the carburetor/cyclinders that make the
mixture be weird and which when run produces the smoke? Do you think I
should have the carb rebuilt or at least cleaned up?
On my Compac 16 I have a very old (I guess, 1946) all-metal 3hp
Evinrude with integrally mounted fuel tank. For some reason, there
were none of these holes above the waterline in the shaft, and it
seemed much quieter. Its exhaust was under the cowling, and I never
saw much smoke coming out.
Andrei.
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