Almost sounds like a sticking needle valve in the carb. Just cause you
"took it apart and blew out all the passages" doesnt mean you cured the
problem. Old, glazed fuel is hard to remove unless you soak the carb
body in carb cleaner for a day..... Your float could be "fuel-logged"
(not floating) as well.

Scott


wrote:
On 20 Jan 2007 16:57:47 -0800, "olchips"
wrote:

I have just aquired an older style ski boat with a 202 engine and weber
carbie. On my first run out it coughed and spluttered but eventually we
got it up to 40mph. On the way back in it kept stalling under idle. We
decided to clean out the carbie and found a bit of muck in jets and
filters. Tried again, this time worse. Didn't even get 50m off shore
and almost flattened battery. Took petrol pump off...replaced pump, put
in fuel shut off valve...tried again. Still no joy...coughs and
splutters and cuts out under load. Any suggestions?


Take it to a professional to check it out.