This is the second season I have taken my Yamaha T9.9 out of storage and had
problems
getting it to run properly. I took extra pains to put it away properly last
year. I used Stabil in the last tank of gas. I also ran some Sea Foam through
it. The
engine was run out until it would not start. I fogged the engine at the end and
opened
a drain plug on the carb to empty any remaining gas. The engine would barely
start
this week and would die when put into gear. I cleaned the jets, but missed the
jet
for mid-range running that was hidden under a plastic cap. My friendly outboard
mechanic
found it and showed me it was blocked. After cleaning this jet, the engine
finally ran. I am using fresh gas, so that was not the problem. I have a
filter on the
gas tank, and there is another one on the engine. It is possibly a combination
of the
newer formulas of gas and the design of these later model four strokes (mine is
a
2002 with less than 50 hours on it). Some people recommend running the engine
at
least every 3 weeks, which is not always possible, and what about winter
lay-ups?
My mechanic recommended using a Mercury product for cleaning carbs that is added

to the gas tank. I am skeptical, but am trying it any ways. I never had any
of these problems with my old two strokes. That's progress!

Sherwin D.

The problem is unfortunately very common. It is caused by the new oxygenated
fuel blends that the Government is stuffing down our throats. These blends
go sour after about 90 days and leave a waxy residue behind that clogs
everything.
Steve

"sherwindu" wrote in message
...
This is the second season I have taken my Yamaha T9.9 out of storage and
had
problems
getting it to run properly. I took extra pains to put it away properly
last
year. I used Stabil in the last tank of gas. I also ran some Sea Foam
through
it. The
engine was run out until it would not start. I fogged the engine at the
end and
opened
a drain plug on the carb to empty any remaining gas. The engine would
barely
start
this week and would die when put into gear. I cleaned the jets, but
missed the
jet
for mid-range running that was hidden under a plastic cap. My friendly
outboard
mechanic
found it and showed me it was blocked. After cleaning this jet, the
engine
finally ran. I am using fresh gas, so that was not the problem. I have a
filter on the
gas tank, and there is another one on the engine. It is possibly a
combination
of the
newer formulas of gas and the design of these later model four strokes
(mine is
a
2002 with less than 50 hours on it). Some people recommend running the
engine
at
least every 3 weeks, which is not always possible, and what about winter
lay-ups?
My mechanic recommended using a Mercury product for cleaning carbs that is
added

to the gas tank. I am skeptical, but am trying it any ways. I never had
any
of these problems with my old two strokes. That's progress!

Sherwin D.

The other thing is that supposedly the jets on 4 stroke engines are a lot
smaller than on a similar size 2 stroke because they use much less fuel, and
that fuel is thinner since there is no oil mix. So it doesn't take as much
debris to foul the jet. Or so I've been told.
I know I had fuel problems w/ my 9.9 Yamaha 4 stroke, especially after rough
seas.

"sherwindu" wrote in message
...
This is the second season I have taken my Yamaha T9.9 out of storage and
had
problems
getting it to run properly. I took extra pains to put it away properly
last
year. I used Stabil in the last tank of gas. I also ran some Sea Foam
through
it. The
engine was run out until it would not start. I fogged the engine at the
end and
opened
a drain plug on the carb to empty any remaining gas. The engine would
barely
start
this week and would die when put into gear. I cleaned the jets, but
missed the
jet
for mid-range running that was hidden under a plastic cap. My friendly
outboard
mechanic
found it and showed me it was blocked. After cleaning this jet, the
engine
finally ran. I am using fresh gas, so that was not the problem. I have a
filter on the
gas tank, and there is another one on the engine. It is possibly a
combination
of the
newer formulas of gas and the design of these later model four strokes
(mine is
a
2002 with less than 50 hours on it). Some people recommend running the
engine
at
least every 3 weeks, which is not always possible, and what about winter
lay-ups?
My mechanic recommended using a Mercury product for cleaning carbs that is
added

to the gas tank. I am skeptical, but am trying it any ways. I never had
any
of these problems with my old two strokes. That's progress!

Sherwin D.