Mys Terry wrote:
On Thu, 04 May 2006 01:16:08 -0500, sherwindu
wrote:


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.


I have the same engine, and mine started right up and ran perfectly
after 6 months of winter storage. The difference in our methods is
that I do not run the engine dry and drain the carb. I leave them full
of gas with stabil.

You have already discovered that storing it dry led to a clogged jet.
That jet wasn't clogged when you put the engine away.


Just wondering - Why would you fog a 4 stroke? I thought the idea of
fogging a 2 stroke was to coat and protect the bearings/cages, etc., in
the otherwise unlubricated (and open to the atmosphere) crankcase area,
since fuel flows thru this area on the way to the combustion chamber.
In a 4 stroke, fuel goes from the carb(s) to the manifold directly into
the combustion chamber. Seems to me that fogging probably adds to the
carburator problems in this type engine.

HH