The correct way to check for the throttle plates opening fully is to move
the throttle to the full throttle position with the engine off then open the
choke plate by hand and look down the throat of the carb to see that the
throtle plates are completely open.

When you say misfiring do you mean that a cylinder misses it firing cycle?
Or it is back firing?

Maybe the float setting is totally pooched. With a correctly functioning
carb the common reason an engine will blow gas back out of the carb is a
stuck valve. Totally out of wack timing or the wires on the wrong cylinders
can also cause it to, but with a 4 banger if you don't have all 4 cylinders
mostly producing power you really notice it. Can you tell if the excess gas
is coming out of the float bowl overflow? That's the vent tube that look
like a J and the open end points back into the carb venturi.

Usually if you and the written instructions are not in agreement then most
likely problem is you are doing something wrong. Start there before you
assume the instructions are wrong.

You did nothing else to this engine at all? It was running rough before you
decided to rebuild the carb? How did you diagnose that the carb needed
rebuilding?


"JamesE" wrote in message
ups.com...
Thanks for the replies. Regarding the statement about the plates not
getting to full throttle, it is definitely getting to full throttle
and the more I advance the throttle the worse the bog gets until it
starts to misfire around full throttle. Also I have already tried
adjusting the mixture screw many times but that isn't helping. I
don't think it is a fuel delivery issue because it is getting plenty
of fuel. I think it is probably getting too much fuel. The other day
I was driving with the engine cover off and the flame arrestor off and
then I had someone go full throttle. The gas was spraying out in
droplets and just spraying all over the place. I don't think that
this is right, so what would cause this? And no matter how fast or
slow I advance the throttle it seems to always bog in the same place.
Also the bog happens all the time, I can't run for any length of time
above 3/4 throttle. Also on the instruction sheet for the rebuilding
kit it gave me the measurement for the accelerator pump but when I
adjusted it like that a piece of the linkage would hit and prevent the
throttle from opening all the way to the throttle stop. So I kind of
just did it by feel and guessed where it should be because that didn't
seem right. So if anyone has any suggestions on why it would be
getting to much gas I would appreciate it. Since this was my first
rebuild I wasn't really expecting it to work, I just wanted to give it
a shot and gain experience. But since I am no expert at carburetors I
think I am going to have it professionally rebuilt that way I can get
some use out of it before the end of the summer. Thanks for the
help. James