Forum Discussion
professor95
Mar 11, 2010Explorer
jlaustin wrote:
I'm working on converting the carb to LPG only using the 1/4" copper line with the 45 deg. bevel to replace the main jet. Here's a pic of the side of the carb:
What does the brass screw (just above my thumb) on the extreme left of the carb do? Do you leave it alone, close it down, or remove it and plug it with epoxy?
That brass screw has been eliminated on all carburetors used on CARB approved engines. It has been replaced with a fixed (non-adjustable) plastic plug or is never drilled.
Since you have it on your carburetor just turn the screw all the way in (clockwise) and leave it there "as is". Should you need to add a vacuum port sometime in the future you can remove the screw and add a tube.
Now, for the 1/4" copper tube. I remember you asking about this several weeks back and I responded thinking you were referring to the tube to a plastic feed block placed in front of the carb. If you are drilling out the main jet in an OEM carb 1/4" may be to large. Reduce your orifice to 3/16 or less as I did in my write up on the LPG conversion thread. I am not at all sure the OEM carb can support a 1/4" hole or how it would perform even if it does not drill through the sides of the jet housing.
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