I just rebuilt my carb on a 04 400 auto and now when I even touch the throttle it dies. The low screw is out 2 1/8 as per the manual the float is 17mm from the top of the float arm to the top of the carb body. We are loosing our minds. Please advise
Assuming that all ports and passageways were thoroughly cleaned and blown out with compressed air. Make sure you did not swap the start jet and the main jet in the placement, the largest numbered jet (largest hole) is installed directly below the needle. Also make sure there are no holes in the rubber diaphragm and the diaphragm cap is seated fully and not leaking vacuum. Finally insure the needle is installed correctly and the slide freely moves with your finger from full down to full open.
thanks for the help guys. My dad ended up ordering a whole new carb. We are gonna keep the old one as a "science project". It makes sense, the advice you gave. I am going to try it. I did dip the all parts in parts cleaner. the book I had on it was not an exact match even though it said it was the right book. A few of the part looked different in the diagram. We changed about $80 in internals. Everything was blown with the compressor after the dip. I think something is in the wrong spot parts wise. Thanks again guys.
By the way, know any good spots online for parts. There really are no dealers in So Cal. Just Outdoor World and they are not a good source for replacements.
I would personally ensure you have the starter jet and main jet in the right spots. If you don't, it won't run worth a crap. Secondly (and more likely), you have to ensure that the rubber diaphram is seated perfectly on the carb. If it's not, it'll cause a vacuum leak and when that happens, it'll idle like a champ all day long but as soon as you give it gas, she'll croak on ya. If you soaked that in parts cleaner, try putting it in the freezer for 30 minutes, then try reinstalling it.
another thing to consider is water in fuel... if u got water in the tank somehow it will idle but not rev. just something to consider because if that's the case the problem will still exist with the new carb. good luck!
I would personally ensure you have the starter jet and main jet in the right spots. If you don't, it won't run worth a crap. Secondly (and more likely), you have to ensure that the rubber diaphram is seated perfectly on the carb. If it's not, it'll cause a vacuum leak and when that happens, it'll idle like a champ all day long but as soon as you give it gas, she'll croak on ya. If you soaked that in parts cleaner, try putting it in the freezer for 30 minutes, then try reinstalling it.[/b]
What you do is take the body of the carb and put the diaphram in that, making sure the needle guides into the hole (obviously). Then, just make sure that the edge of your diaphram boot seats in that little groove all the way around the top of the carb body. Once it is, carefully take the spring and cover and put them on, ensuring that the diaphram stays in the groove. Once you have the cover on, keep pressure on it and install the screws one at a time, going corner to corner with the installation.
That diaphragm can be a bugger for sure, this is how I tackle that project.
I place the diaphragm/slide into the carb and place the cover on loosely, next I reach inside carb and lift the slide all the way up. This kind of pushes the diaphragm up and inside cover.
This helps it into place, then push down on cover lightly, making sure you have the same exact gap all the way around the the cover and the carb, if it looks higher on one side, start over.
Sometimes an extra set of hands can help with this.
This method works.
I would think that the freezer method and the one above would work together also.
I did the same thing first time I went inside a carb, started great, idled great, and thats about it.
What I found to work best is to put a little red & tacky in the groove to hold the diaphragm in place. It works a lot better than putting it in the freezer.
i've done the red and tacky and the freezer, and both at the same time. to much red and tacky can cause the slide to stick later as it runs down, so go light.
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