If you look in the parts manual you will see a different adjusting screw and main jet for fire crater pistons. It has a different taper, length and the main jet it larger but I can't remember if it is longer or shorter than original. It is also calibrated for full load horsepower at five turns out so it is way clear of the jet for zero restriction. Actually most are clear at about 3 l/2 turns out after bottoming. Can't tell by looking at carb what parts are inside of them even though there was no updating of the number on the carburetor.
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