I had a 3hp Tanaka and had the same problem. It turned out to be the gas
tank cap was not venting. Best thing that ever happened to me was when I
dropped the cap into the river. Bought a new one from Tanaka and never had
that problem again. A 1/32nd drill bit would cure the problem.
Rich
"Michiel" wrote in message
...
Hello,

I have a 3hp Sears Gamefisher aircooled outboard. It's Tanaka 300 with
Sears brand.

It developed a problem:

After running at full throttle with no problems for 10 minutes os so,
it'll start to cut out. The engine speed will drop fast. At first,
it'll keep running and pick up speed again, but it will cut out again
and if I don't close the throttle, it'll get so bad that the engine
dies.

Running it at low rpm for a while eases the problem: I can then get
back to full throttle and it'll take a minute or so before it starts
to cut out again.

Because of the initial time without problem, I'm thinking that the
problem is heat related.

I cleaned out the carb and put in a new spark plug, but no relief. I
also verified that there is good flow through the fuel valve and hose.

Any idea what this could be? Is it more likely an ignition or a fuel
problem? How can I troubleshoot this?

I'd appreciate any advise or pointers.

Thank you,

Michiel