72 Evinrude 25HP Troubles
 

Just got this motor from a friend and went over the whole motor myself. New
points, condensers, plugs, wires, coils, new fuel lines and fittings
including primer bulb and fuel pump, cleaned carb and installed an
automotive type inline filter between motor fitting and inlet of fuel pump.
Motor runs great once you warm up and get on it. Been having problems with
motor losing power at full throttle. Found I had bad priomer bulb this
morning and was pushing gas back into the tank. Replaced it and went out
again today. Well this time it ran OK until I stopped it and fished awhile.
Then motor was hard to start and was missing out again at extended full
throttle running in the bayou. Bypassed motor fitting and fuel filter I
added and connected gas line directly to the fuel pump. This time it ran
great. Ran it hard and for extended time to make sure I fixed it. It was
running good until I was idling back to the launch. Then it was shaking and
sounding rough. Came back home and pulled plugs. They are fouled now. Gooey
oil all over them. Just for fun, I pulled the thermostat cover off and guess
what? No thermostat. Had a spare one around that hasn't been used. It is a
140F thermostat. Put it in tonight, but haven't cranked it. Could this be
the source of all my troubles? Should I reconnect my inline filter? What
effects will overcooling an engine do. Could I have caused any major engine
damage by running it like that? Gonna try it tommorow and see what happens
on some new plugs.

72 Evinrude 25HP Troubles
 

I doubt overcooling for a short time will lead to serious trouble. Past
that - use trial and error regarding inline filters etc.

-W


--

PLEASE NOTE: Email address change from to

wrote in message
...
Just got this motor from a friend and went over the whole motor myself.
New
points, condensers, plugs, wires, coils, new fuel lines and fittings
including primer bulb and fuel pump, cleaned carb and installed an
automotive type inline filter between motor fitting and inlet of fuel
pump.
Motor runs great once you warm up and get on it. Been having problems with
motor losing power at full throttle. Found I had bad priomer bulb this
morning and was pushing gas back into the tank. Replaced it and went out
again today. Well this time it ran OK until I stopped it and fished
awhile.
Then motor was hard to start and was missing out again at extended full
throttle running in the bayou. Bypassed motor fitting and fuel filter I
added and connected gas line directly to the fuel pump. This time it ran
great. Ran it hard and for extended time to make sure I fixed it. It was
running good until I was idling back to the launch. Then it was shaking
and
sounding rough. Came back home and pulled plugs. They are fouled now.
Gooey
oil all over them. Just for fun, I pulled the thermostat cover off and
guess
what? No thermostat. Had a spare one around that hasn't been used. It is a
140F thermostat. Put it in tonight, but haven't cranked it. Could this be
the source of all my troubles? Should I reconnect my inline filter? What
effects will overcooling an engine do. Could I have caused any major
engine
damage by running it like that? Gonna try it tommorow and see what happens
on some new plugs.

72 Evinrude 25HP Troubles
 

Get an outboard fuel filter. Some filters have higher restrictions than
others. You definetly need some sort of filter. Is there still one on the
engine.
Since you are from the south, we always removed the thermostats here in
Alabama to ensure good water flow and cooling. Definetly not your problem.
How much oil are you running and what brand. You should be running 50:1 oil
and Merc, yamaha, or OMC TCW3. Cheap junk oil will foul plugs due to not
burning properly.
Whichever oil you go w/ continue to use. Different additives make for junk
if you keep mixing them (so I have been told).

1. install proper filter.
2. install new plugs.
3. install fresh 93 octane fuel and good oil at 50:1.
4. retry.

If this does not solve it, then chances are you have a carb problem. Tear
down and check your float positions and clean again.

--
Tony
My boats and autos - http://t.thomas.home.mchsi.com



wrote in message
...
Just got this motor from a friend and went over the whole motor myself.
New
points, condensers, plugs, wires, coils, new fuel lines and fittings
including primer bulb and fuel pump, cleaned carb and installed an
automotive type inline filter between motor fitting and inlet of fuel
pump.
Motor runs great once you warm up and get on it. Been having problems with
motor losing power at full throttle. Found I had bad priomer bulb this
morning and was pushing gas back into the tank. Replaced it and went out
again today. Well this time it ran OK until I stopped it and fished
awhile.
Then motor was hard to start and was missing out again at extended full
throttle running in the bayou. Bypassed motor fitting and fuel filter I
added and connected gas line directly to the fuel pump. This time it ran
great. Ran it hard and for extended time to make sure I fixed it. It was
running good until I was idling back to the launch. Then it was shaking
and
sounding rough. Came back home and pulled plugs. They are fouled now.
Gooey
oil all over them. Just for fun, I pulled the thermostat cover off and
guess
what? No thermostat. Had a spare one around that hasn't been used. It is a
140F thermostat. Put it in tonight, but haven't cranked it. Could this be
the source of all my troubles? Should I reconnect my inline filter? What
effects will overcooling an engine do. Could I have caused any major
engine
damage by running it like that? Gonna try it tommorow and see what happens
on some new plugs.