Rebuild the carb.

--
Tony
my boats at http://t.thomas.home.mchsi.com

"calhoun" wrote in message
...
HI

1986 4HP, runs great wide open but will not run slow unless the choke is
partially pulled. This has been a problem that has slowly developed over
the
season. I used to be able to use the mixture screw and get it to run at
troll speed. That no longer can be adjusted enough. Any ideas on the
cause?

thanks

Paul