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Main jet in carb will not tighten up what can I do?

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michaelrj9:

--- Quote from: Ethan1 on May 02, 2015, 07:05:03 PM --- That probably your problem. Crappy threads. What size drill bit did you use? Usually when it comes to drilling carburetor jet holes, you need a vertical mill and a perfectly flat surface. If it is off just by a little bit, it will not work. Simple as that. I guess you can use Marine-Tex, but I would not recommend it.

--- End quote ---

I just checked again and the depth seems the same as the other one but the hole is to big on the top. The jet will sit flush when dropped in, the good one sets up about 1 turn.


If I drill deeper and tap it deeper will it mess up the amount of fuel passes through or will that still be controlled by the jet.  (as long as I don't go through the bottom of the carb :)


This is for a car that is barley driven and if driven only 5-10 miles at a time a couple times a year. But like to move it out of the garage maybe a couple times a month so it does not have to be perfect.

How about a helicoil? The part that concerns me about that is the length of the coil can it be cut down? Or after installation and need to break off the tab inside not sure if it will come out and not stay in the hole.

Ethan1:

--- Quote from: michaelrj9 on May 02, 2015, 07:21:33 PM ---I just checked again and the depth seems the same as the other one but the hole is to big on the top. The jet will sit flush when dropped in, the good one sets up about 1 turn.


If I drill deeper and tap it deeper will it mess up the amount of fuel passes through or will that still be controlled by the jet.  (as long as I don't go through the bottom of the carb :)


This is for a car that is barley driven and if driven only 5-10 miles at a time a couple times a year. But like to move it out of the garage maybe a couple times a month so it does not have to be perfect.

How about a helicoil? The part that concerns me about that is the length of the coil can it be cut down? Or after installation and need to break off the tab inside not sure if it will come out and not stay in the hole.

--- End quote ---

 A Helicoil would probably be the best way to go, as it sounds like the hole is off/bigger than it should be. They make Helicoils for everything. It wouldn't hurt to try. :)

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