ralfyguy wrote on 09/03/10 at 04:40:26:Is there a chart for the actual drill size in jets? I wish I could make something between a 52.5 and a 55 pilot.
not sure about a chart...I have vague shadows in my mind but have no idea if it is the chart you want
I do not have this info on hand right now but will try to find out.
...ever seen a drill bit small enough to use for a pilot jet ? ? not me
there are sets of tiny files, some regular and some diamond coated, but the sets are basically the same size and shape
the round pointed file can be used
VERY CAREFULLY to enlarge the hole in a jet
just keep in mind that the jet is made of brass and is very soft compared to the file
insert the point of the file in the hole of the jet and rotate the file with your finger tips
GENTLY once or twice and then check it
I try to find a wire that just barely goes through the hole of the jet, so I have something to use to compare after each filing...does it go through about the same or is it easier ?
if it feels like the hole is slightly larger then install in the carb and test it.
the holes are so small to begin with that it does not take much at all to change the fuel flow a
LOT, so go slow and easy
The first time I tried this I filed the hole until I could SEE that it was larger..... at that point I had already jumped 3-4 jet sizes, so DO NOT GO BY HOW IT LOOKS ...find a wire that just barely fits and judge by how it feels going in and out. That is a good idea with the file. But like you said, VERY easy to got too far rather quickly. I had a similar idea, but kinda chickened out to try that. I am a precision machinist from Germany, relocated to the US without a shop and any appropriate tools, due to lack of space and funds. Very frustrating if you know what to do, but can't because of those restrictions. I miss working in a good shop, especially my lathe.
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