I have a 5yr old Mercury
that has been trouble free until last year. It is the 2.5HP 4 stroke
Last year it started having problems which may have been due to absentmindedly leaving some unleaded in the system for a few months. Basically I forgot to drain the tank and fuel
line. When I came back to use it the engine
just wouldn't start. Got the marina mechanic
to look at it and he cleaned it all out, blowing through the carb with compressed air and it fired up fine.
Out on the water
I tried using it and it took several pulls to fire then would not idle. But give it the beans and it revved fine. Got to and from the shore using the choke and fast idle. As we were not going to be using the outboard
for a few days I decided to just let the engine
run until the fuel
ran out to see if the idle problem would fix itself. A few minutes of idle and it died then pi55ed petrol out of the overflow lines.
Got back to home marina and tried cleaning
the system again and checked everything over. Float was freely moving, jet was clear and no signs of anything sticking, jamming or otherwise not working. Fired it up again and it started first pull and idled like a dream. But give it the gas and it would not rev at all. First little movement of the throttle and it would die but restart first pull.
It has been like this since then and I can't figure out why. Some days it fires first pull, others it takes 3 or 4. Sometimes it will idle but not rev others it revs but won't idle. There are days when I check the insurance
with a mind to "accidentally" dropping the damn thing off the back
Any ideas what could be the problem and what I can do to rectify it?
If it helps the numbers embossed in the carb are 3DVCVGF or could be t