Here is the latest update on my problem. I cleaned out my tank and replaced it
with
fresh gas. I also purged the fuel delivery lines and the carburetor of old gas.
That did not do the trick to start the engine. There were some orangish deposits
on the
base of the carb after I opened it up. Also, some dark droplets were mixed in
with
the old gas taken out of the carb. What finally did the job was running fine
wires
through the low and high speed jets. It is working fine now, but for how long? I
think I might replace the fuel line for next year. I have been told I should be
using
at least a 10 micron filter. My external Tempo filter is only 40 microns. I have
no
idea what the filter inside the engine is rated for. The basic problem are these
very
fine jets on the smaller horsepower ( 9.9) four stroke engines. Yamaha has been
making them for some time, but seem to be burying the problem.

Sherwin D.

sherwindu wrote:

I have been having a series of problems with my 2002 Yamaha 9.9 4-stroke
outboard, mainly with blocked up carburetor jets. This season, I have had to
strip them down three times to clean the jets. I have been putting Stabil and
Mercury Quick Silver Cleaner in the gas tank, and that seemed to help for a
month, until today, while out on Lake Michigan the engine stopped running
again. I don't know if all 4-stroke engines behave like this, all Yamahas, or
just my particular engine. I expect better performance from an engine costing
over two thousand dollars.