Roger,
I struggled with the same problem on my Yamaha 9.9. Rebuilding the
carburetor solves the problem... for a few months. A new in-line
fuel filter and gas preservative is supposed to help, and probably
does. Also, Yamaha sells a special fuel system cleaner with which
you need to run a full tank of gas, then change the oil. The motor
runs poorly with this stuff in the gas, but seemed to run well on
fresh gas... for a few months. Ultimately, my solution was to buy a
Honda.
It's my belief that the newer 4-stroke engines (especially in
California) are jetted very lean to meet strict emmission standards,
but this makes them vulnerable to even the slightest build-up in
their slow fuel circuits. Add to that crappy gas and the fact that
we burn maybe a quart/weekend and leave it sit in the warm SoCal. sun
all week, just makes it worse.
Good luck,
Colin
--- In [EMAIL PROTECTED], "Roger L." <[EMAIL PROTECTED]> wrote:
> Our Yamaha 9.9 four stroke OB started doing a weird behavior
> this year. When it is running in gear at low RPM it will
> sometimes just start running weakly and then die. Changing from
> forward to reverse gear at low RPM at first seems to work fine,
> but will almost guarantee that the motor will go weak and die in
> the next 5 to 15 seconds or so. This tends to happen when I'm
> running slow anyway.....like when approaching the dock....or the
> trailer. Lots of excitement then. When it does this, the motor
> sounds like it is just running out of gas. This perception is
> reinforced because if I pump the bulb, it will start right up
> again and run fine for awhile.
>
>
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